feat(client): implement photoswipe at different points

apps/client/package.json

@@ -55,7 +55,8 @@
     "split.js": "1.6.5",
     "svg-pan-zoom": "3.6.2",
     "tabulator-tables": "6.3.1",
-    "vanilla-js-wheel-zoom": "9.0.4"
+    "vanilla-js-wheel-zoom": "9.0.4",
+    "photoswipe": "^5.4.4"
   },
   "devDependencies": {
     "@ckeditor/ckeditor5-inspector": "5.0.0",

apps/client/src/desktop.ts

@@ -13,6 +13,8 @@ import type ElectronRemote from "@electron/remote";
 import type Electron from "electron";
 import "./stylesheets/bootstrap.scss";
 import "boxicons/css/boxicons.min.css";
+import "./stylesheets/media-viewer.css";
+import "./styles/gallery.css";
 import "autocomplete.js/index_jquery.js";
 
 await appContext.earlyInit();

apps/client/src/menus/image_context_menu.ts

@@ -2,6 +2,8 @@ import { t } from "../services/i18n.js";
 import utils from "../services/utils.js";
 import contextMenu from "./context_menu.js";
 import imageService from "../services/image.js";
+import mediaViewer from "../services/media_viewer.js";
+import type { MediaItem } from "../services/media_viewer.js";
 
 const PROP_NAME = "imageContextMenuInstalled";
 
@@ -18,6 +20,12 @@ function setupContextMenu($image: JQuery<HTMLElement>) {
             x: e.pageX,
             y: e.pageY,
             items: [
+                {
+                    title: "View in Lightbox",
+                    command: "viewInLightbox",
+                    uiIcon: "bx bx-expand",
+                    enabled: true
+                },
                 {
                     title: t("image_context_menu.copy_reference_to_clipboard"),
                     command: "copyImageReferenceToClipboard",
@@ -30,7 +38,48 @@ function setupContextMenu($image: JQuery<HTMLElement>) {
                 }
             ],
             selectMenuItemHandler: async ({ command }) => {
-                if (command === "copyImageReferenceToClipboard") {
+                if (command === "viewInLightbox") {
+                    const src = $image.attr("src");
+                    const alt = $image.attr("alt");
+                    const title = $image.attr("title");
+                    
+                    if (!src) {
+                        console.error("Missing image source");
+                        return;
+                    }
+                    
+                    const item: MediaItem = {
+                        src: src,
+                        alt: alt || "Image",
+                        title: title || alt,
+                        element: $image[0] as HTMLElement
+                    };
+                    
+                    // Try to get actual dimensions
+                    const imgElement = $image[0] as HTMLImageElement;
+                    if (imgElement.naturalWidth && imgElement.naturalHeight) {
+                        item.width = imgElement.naturalWidth;
+                        item.height = imgElement.naturalHeight;
+                    }
+                    
+                    mediaViewer.openSingle(item, {
+                        bgOpacity: 0.95,
+                        showHideOpacity: true,
+                        pinchToClose: true,
+                        closeOnScroll: false,
+                        closeOnVerticalDrag: true,
+                        wheelToZoom: true,
+                        getThumbBoundsFn: () => {
+                            // Get position for zoom animation
+                            const rect = imgElement.getBoundingClientRect();
+                            return {
+                                x: rect.left,
+                                y: rect.top,
+                                w: rect.width
+                            };
+                        }
+                    });
+                } else if (command === "copyImageReferenceToClipboard") {
                     imageService.copyImageReferenceToClipboard($image);
                 } else if (command === "copyImageToClipboard") {
                     try {

apps/client/src/mobile.ts

@@ -3,6 +3,7 @@ import noteAutocompleteService from "./services/note_autocomplete.js";
 import glob from "./services/glob.js";
 import "./stylesheets/bootstrap.scss";
 import "boxicons/css/boxicons.min.css";
+import "./stylesheets/media-viewer.css";
 import "autocomplete.js/index_jquery.js";
 
 glob.setupGlobs();

apps/client/src/services/ckeditor_photoswipe_integration.ts

@@ -0,0 +1,521 @@
+/**
+ * CKEditor PhotoSwipe Integration
+ * Handles click-to-lightbox functionality for images in CKEditor content
+ */
+
+import mediaViewer from './media_viewer.js';
+import galleryManager from './gallery_manager.js';
+import appContext from '../components/app_context.js';
+import type { MediaItem } from './media_viewer.js';
+import type { GalleryItem } from './gallery_manager.js';
+
+/**
+ * Configuration for CKEditor PhotoSwipe integration
+ */
+interface CKEditorPhotoSwipeConfig {
+    enableGalleryMode?: boolean;
+    showHints?: boolean;
+    hintDelay?: number;
+    excludeSelector?: string;
+}
+
+/**
+ * Integration manager for CKEditor and PhotoSwipe
+ */
+class CKEditorPhotoSwipeIntegration {
+    private static instance: CKEditorPhotoSwipeIntegration;
+    private config: Required<CKEditorPhotoSwipeConfig>;
+    private observers: Map<HTMLElement, MutationObserver> = new Map();
+    private processedImages: WeakSet<HTMLImageElement> = new WeakSet();
+    private containerGalleries: Map<HTMLElement, GalleryItem[]> = new Map();
+    private hintPool: HTMLElement[] = [];
+    private activeHints: Map<string, HTMLElement> = new Map();
+    private hintTimeouts: Map<string, number> = new Map();
+    
+    private constructor() {
+        this.config = {
+            enableGalleryMode: true,
+            showHints: true,
+            hintDelay: 2000,
+            excludeSelector: '.no-lightbox, .cke_widget_element'
+        };
+    }
+    
+    /**
+     * Get singleton instance
+     */
+    static getInstance(): CKEditorPhotoSwipeIntegration {
+        if (!CKEditorPhotoSwipeIntegration.instance) {
+            CKEditorPhotoSwipeIntegration.instance = new CKEditorPhotoSwipeIntegration();
+        }
+        return CKEditorPhotoSwipeIntegration.instance;
+    }
+    
+    /**
+     * Setup integration for a CKEditor content container
+     */
+    setupContainer(container: HTMLElement | JQuery<HTMLElement>, config?: Partial<CKEditorPhotoSwipeConfig>): void {
+        const element = container instanceof $ ? container[0] : container;
+        if (!element) return;
+        
+        // Merge configuration
+        if (config) {
+            this.config = { ...this.config, ...config };
+        }
+        
+        // Process existing images
+        this.processImages(element);
+        
+        // Setup mutation observer for dynamically added images
+        this.observeContainer(element);
+        
+        // Setup gallery if enabled
+        if (this.config.enableGalleryMode) {
+            this.setupGalleryMode(element);
+        }
+    }
+    
+    /**
+     * Process all images in a container
+     */
+    private processImages(container: HTMLElement): void {
+        const images = container.querySelectorAll<HTMLImageElement>(`img:not(${this.config.excludeSelector})`);
+        
+        images.forEach(img => {
+            if (!this.processedImages.has(img)) {
+                this.setupImageLightbox(img);
+                this.processedImages.add(img);
+            }
+        });
+    }
+    
+    /**
+     * Setup lightbox for a single image
+     */
+    private setupImageLightbox(img: HTMLImageElement): void {
+        // Skip if already processed or is a CKEditor widget element
+        if (img.closest('.cke_widget_element') || img.closest('.ck-widget')) {
+            return;
+        }
+        
+        // Make image clickable and mark it as PhotoSwipe-enabled
+        img.style.cursor = 'zoom-in';
+        img.style.transition = 'opacity 0.2s';
+        img.classList.add('photoswipe-enabled');
+        img.setAttribute('data-photoswipe', 'true');
+        
+        // Store event handlers for cleanup
+        const mouseEnterHandler = () => {
+            img.style.opacity = '0.9';
+            if (this.config.showHints) {
+                this.showHint(img);
+            }
+        };
+        
+        const mouseLeaveHandler = () => {
+            img.style.opacity = '1';
+            this.hideHint(img);
+        };
+        
+        // Add hover effect with cleanup tracking
+        img.addEventListener('mouseenter', mouseEnterHandler);
+        img.addEventListener('mouseleave', mouseLeaveHandler);
+        
+        // Store handlers for cleanup
+        (img as any)._photoswipeHandlers = { mouseEnterHandler, mouseLeaveHandler };
+        
+        // Add double-click handler to prevent default navigation behavior
+        const dblClickHandler = (e: MouseEvent) => {
+            // Only prevent double-click in specific contexts to avoid breaking other features
+            if (img.closest('.attachment-detail-wrapper') || 
+                img.closest('.note-detail-editable-text') ||
+                img.closest('.note-detail-readonly-text')) {
+                e.preventDefault();
+                e.stopPropagation();
+                e.stopImmediatePropagation();
+                
+                // Trigger the same behavior as single click (open lightbox)
+                img.click();
+            }
+        };
+        
+        img.addEventListener('dblclick', dblClickHandler, true); // Use capture phase to ensure we get it first
+        (img as any)._photoswipeHandlers.dblClickHandler = dblClickHandler;
+        
+        // Add click handler
+        img.addEventListener('click', (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            
+            // Check if we should open as gallery
+            const container = img.closest('.note-detail-editable-text, .note-detail-readonly-text');
+            if (container && this.config.enableGalleryMode) {
+                const gallery = this.containerGalleries.get(container as HTMLElement);
+                if (gallery && gallery.length > 1) {
+                    // Find index of clicked image
+                    const index = gallery.findIndex(item => {
+                        const itemElement = document.querySelector(`img[src="${item.src}"]`);
+                        return itemElement === img;
+                    });
+                    
+                    galleryManager.openGallery(gallery, index >= 0 ? index : 0, {
+                        showThumbnails: true,
+                        showCounter: true,
+                        enableKeyboardNav: true,
+                        loop: true
+                    });
+                    return;
+                }
+            }
+            
+            // Open single image
+            this.openSingleImage(img);
+        });
+        
+        // Add keyboard support
+        img.setAttribute('tabindex', '0');
+        img.setAttribute('role', 'button');
+        img.setAttribute('aria-label', 'Click to view in lightbox');
+        
+        img.addEventListener('keydown', (e) => {
+            if (e.key === 'Enter' || e.key === ' ') {
+                e.preventDefault();
+                img.click();
+            }
+        });
+    }
+    
+    /**
+     * Open a single image in lightbox
+     */
+    private openSingleImage(img: HTMLImageElement): void {
+        const item: MediaItem = {
+            src: img.src,
+            alt: img.alt || 'Image',
+            title: img.title || img.alt,
+            element: img,
+            width: img.naturalWidth || undefined,
+            height: img.naturalHeight || undefined
+        };
+        
+        mediaViewer.openSingle(item, {
+            bgOpacity: 0.95,
+            showHideOpacity: true,
+            pinchToClose: true,
+            closeOnScroll: false,
+            closeOnVerticalDrag: true,
+            wheelToZoom: true,
+            getThumbBoundsFn: () => {
+                const rect = img.getBoundingClientRect();
+                return {
+                    x: rect.left,
+                    y: rect.top,
+                    w: rect.width
+                };
+            }
+        }, {
+            onClose: () => {
+                // Check if we're in attachment detail view and need to reset viewScope
+                const activeContext = appContext.tabManager.getActiveContext();
+                if (activeContext?.viewScope?.viewMode === 'attachments') {
+                    // Get the note ID from the image source
+                    const attachmentMatch = img.src.match(/\/api\/attachments\/([A-Za-z0-9_]+)\/image\//);
+                    if (attachmentMatch) {
+                        const currentAttachmentId = activeContext.viewScope.attachmentId;
+                        if (currentAttachmentId === attachmentMatch[1]) {
+                            // Actually reset the viewScope instead of just logging
+                            try {
+                                if (activeContext.note) {
+                                    activeContext.setNote(activeContext.note.noteId, { 
+                                        viewScope: { viewMode: 'default' } 
+                                    });
+                                }
+                            } catch (error) {
+                                console.error('Failed to reset viewScope after PhotoSwipe close:', error);
+                            }
+                        }
+                    }
+                }
+                // Restore focus to the image
+                img.focus();
+            }
+        });
+    }
+    
+    /**
+     * Setup gallery mode for a container
+     */
+    private setupGalleryMode(container: HTMLElement): void {
+        const images = container.querySelectorAll<HTMLImageElement>(`img:not(${this.config.excludeSelector})`);
+        if (images.length <= 1) return;
+        
+        const galleryItems: GalleryItem[] = [];
+        
+        images.forEach((img, index) => {
+            // Skip CKEditor widget elements
+            if (img.closest('.cke_widget_element') || img.closest('.ck-widget')) {
+                return;
+            }
+            
+            const item: GalleryItem = {
+                src: img.src,
+                alt: img.alt || `Image ${index + 1}`,
+                title: img.title || img.alt,
+                element: img,
+                index: index,
+                width: img.naturalWidth || undefined,
+                height: img.naturalHeight || undefined
+            };
+            
+            // Check for caption
+            const figure = img.closest('figure');
+            if (figure) {
+                const caption = figure.querySelector('figcaption');
+                if (caption) {
+                    item.caption = caption.textContent || undefined;
+                }
+            }
+            
+            galleryItems.push(item);
+        });
+        
+        if (galleryItems.length > 0) {
+            this.containerGalleries.set(container, galleryItems);
+        }
+    }
+    
+    /**
+     * Observe container for dynamic changes
+     */
+    private observeContainer(container: HTMLElement): void {
+        // Disconnect existing observer if any
+        const existingObserver = this.observers.get(container);
+        if (existingObserver) {
+            existingObserver.disconnect();
+        }
+        
+        const observer = new MutationObserver((mutations) => {
+            let hasNewImages = false;
+            
+            mutations.forEach(mutation => {
+                if (mutation.type === 'childList') {
+                    mutation.addedNodes.forEach(node => {
+                        if (node.nodeType === Node.ELEMENT_NODE) {
+                            const element = node as HTMLElement;
+                            if (element.tagName === 'IMG') {
+                                hasNewImages = true;
+                            } else if (element.querySelector('img')) {
+                                hasNewImages = true;
+                            }
+                        }
+                    });
+                }
+            });
+            
+            if (hasNewImages) {
+                // Process new images
+                this.processImages(container);
+                
+                // Update gallery if enabled
+                if (this.config.enableGalleryMode) {
+                    this.setupGalleryMode(container);
+                }
+            }
+        });
+        
+        observer.observe(container, {
+            childList: true,
+            subtree: true
+        });
+        
+        this.observers.set(container, observer);
+    }
+    
+    /**
+     * Get or create a hint element from the pool
+     */
+    private getHintFromPool(): HTMLElement {
+        let hint = this.hintPool.pop();
+        if (!hint) {
+            hint = document.createElement('div');
+            hint.className = 'ckeditor-image-hint';
+            hint.textContent = 'Click to view in lightbox';
+            hint.style.cssText = `
+                position: absolute;
+                background: rgba(0, 0, 0, 0.8);
+                color: white;
+                padding: 4px 8px;
+                border-radius: 4px;
+                font-size: 12px;
+                z-index: 1000;
+                pointer-events: none;
+                opacity: 0;
+                transition: opacity 0.3s;
+                display: none;
+            `;
+        }
+        return hint;
+    }
+    
+    /**
+     * Return hint to pool
+     */
+    private returnHintToPool(hint: HTMLElement): void {
+        hint.style.opacity = '0';
+        hint.style.display = 'none';
+        if (this.hintPool.length < 10) { // Keep max 10 hints in pool
+            this.hintPool.push(hint);
+        } else {
+            hint.remove();
+        }
+    }
+    
+    /**
+     * Show hint for an image
+     */
+    private showHint(img: HTMLImageElement): void {
+        // Check if hint already exists
+        const imgId = img.dataset.imgId || `img-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
+        if (!img.dataset.imgId) {
+            img.dataset.imgId = imgId;
+        }
+        
+        // Clear any existing timeout
+        const existingTimeout = this.hintTimeouts.get(imgId);
+        if (existingTimeout) {
+            clearTimeout(existingTimeout);
+            this.hintTimeouts.delete(imgId);
+        }
+        
+        let hint = this.activeHints.get(imgId);
+        if (hint) {
+            hint.style.opacity = '1';
+            return;
+        }
+        
+        // Get hint from pool
+        hint = this.getHintFromPool();
+        this.activeHints.set(imgId, hint);
+        
+        // Position and show hint
+        if (!hint.parentElement) {
+            document.body.appendChild(hint);
+        }
+        
+        const imgRect = img.getBoundingClientRect();
+        hint.style.display = 'block';
+        hint.style.left = `${imgRect.left + (imgRect.width - hint.offsetWidth) / 2}px`;
+        hint.style.top = `${imgRect.top - hint.offsetHeight - 5}px`;
+        
+        // Show hint
+        requestAnimationFrame(() => {
+            hint.style.opacity = '1';
+        });
+        
+        // Auto-hide after delay
+        const timeout = window.setTimeout(() => {
+            this.hideHint(img);
+        }, this.config.hintDelay);
+        this.hintTimeouts.set(imgId, timeout);
+    }
+    
+    /**
+     * Hide hint for an image
+     */
+    private hideHint(img: HTMLImageElement): void {
+        const imgId = img.dataset.imgId;
+        if (!imgId) return;
+        
+        // Clear timeout
+        const timeout = this.hintTimeouts.get(imgId);
+        if (timeout) {
+            clearTimeout(timeout);
+            this.hintTimeouts.delete(imgId);
+        }
+        
+        const hint = this.activeHints.get(imgId);
+        if (hint) {
+            hint.style.opacity = '0';
+            this.activeHints.delete(imgId);
+            
+            setTimeout(() => {
+                this.returnHintToPool(hint);
+            }, 300);
+        }
+    }
+    
+    /**
+     * Cleanup integration for a container
+     */
+    cleanupContainer(container: HTMLElement | JQuery<HTMLElement>): void {
+        const element = container instanceof $ ? container[0] : container;
+        if (!element) return;
+        
+        // Disconnect observer
+        const observer = this.observers.get(element);
+        if (observer) {
+            observer.disconnect();
+            this.observers.delete(element);
+        }
+        
+        // Clear gallery
+        this.containerGalleries.delete(element);
+        
+        // Remove event handlers and hints
+        const images = element.querySelectorAll<HTMLImageElement>('img');
+        images.forEach(img => {
+            this.hideHint(img);
+            
+            // Remove event handlers
+            const handlers = (img as any)._photoswipeHandlers;
+            if (handlers) {
+                img.removeEventListener('mouseenter', handlers.mouseEnterHandler);
+                img.removeEventListener('mouseleave', handlers.mouseLeaveHandler);
+                if (handlers.dblClickHandler) {
+                    img.removeEventListener('dblclick', handlers.dblClickHandler, true);
+                }
+                delete (img as any)._photoswipeHandlers;
+            }
+            
+            // Mark as unprocessed
+            this.processedImages.delete(img);
+        });
+    }
+    
+    /**
+     * Update configuration
+     */
+    updateConfig(config: Partial<CKEditorPhotoSwipeConfig>): void {
+        this.config = { ...this.config, ...config };
+    }
+    
+    /**
+     * Cleanup all integrations
+     */
+    cleanup(): void {
+        // Disconnect all observers
+        this.observers.forEach(observer => observer.disconnect());
+        this.observers.clear();
+        
+        // Clear all galleries
+        this.containerGalleries.clear();
+        
+        // Clear all hints
+        this.activeHints.forEach(hint => hint.remove());
+        this.activeHints.clear();
+        
+        // Clear all timeouts
+        this.hintTimeouts.forEach(timeout => clearTimeout(timeout));
+        this.hintTimeouts.clear();
+        
+        // Clear hint pool
+        this.hintPool.forEach(hint => hint.remove());
+        this.hintPool = [];
+        
+        // Clear processed images
+        this.processedImages = new WeakSet();
+    }
+}
+
+// Export singleton instance
+export default CKEditorPhotoSwipeIntegration.getInstance();

apps/client/src/services/gallery_manager.spec.ts

@@ -0,0 +1,387 @@
+/**
+ * Tests for Gallery Manager
+ */
+
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import galleryManager from './gallery_manager';
+import mediaViewer from './media_viewer';
+import type { GalleryItem, GalleryConfig } from './gallery_manager';
+import type { MediaViewerCallbacks } from './media_viewer';
+
+// Mock media viewer
+vi.mock('./media_viewer', () => ({
+    default: {
+        open: vi.fn(),
+        openSingle: vi.fn(),
+        close: vi.fn(),
+        next: vi.fn(),
+        prev: vi.fn(),
+        goTo: vi.fn(),
+        getCurrentIndex: vi.fn(() => 0),
+        isOpen: vi.fn(() => false),
+        getImageDimensions: vi.fn(() => Promise.resolve({ width: 800, height: 600 }))
+    }
+}));
+
+// Mock froca
+vi.mock('./froca', () => ({
+    default: {
+        getNoteComplement: vi.fn()
+    }
+}));
+
+// Mock utils
+vi.mock('./utils', () => ({
+    default: {
+        createImageSrcUrl: vi.fn((note: any) => `/api/images/${note.noteId}`),
+        randomString: vi.fn(() => 'test123')
+    }
+}));
+
+describe('GalleryManager', () => {
+    let mockItems: GalleryItem[];
+    
+    beforeEach(() => {
+        // Reset mocks
+        vi.clearAllMocks();
+        
+        // Create mock gallery items
+        mockItems = [
+            {
+                src: '/api/images/note1/image1.jpg',
+                alt: 'Image 1',
+                title: 'First Image',
+                noteId: 'note1',
+                index: 0,
+                width: 800,
+                height: 600
+            },
+            {
+                src: '/api/images/note1/image2.jpg',
+                alt: 'Image 2',
+                title: 'Second Image',
+                noteId: 'note1',
+                index: 1,
+                width: 1024,
+                height: 768
+            },
+            {
+                src: '/api/images/note1/image3.jpg',
+                alt: 'Image 3',
+                title: 'Third Image',
+                noteId: 'note1',
+                index: 2,
+                width: 1920,
+                height: 1080
+            }
+        ];
+        
+        // Setup DOM
+        document.body.innerHTML = '';
+    });
+    
+    afterEach(() => {
+        // Cleanup
+        galleryManager.cleanup();
+        document.body.innerHTML = '';
+    });
+    
+    describe('Gallery Creation', () => {
+        it('should create gallery from container with images', async () => {
+            // Create container with images
+            const container = document.createElement('div');
+            container.innerHTML = `
+                <img src="/api/images/note1/image1.jpg" alt="Image 1" />
+                <img src="/api/images/note1/image2.jpg" alt="Image 2" />
+                <img src="/api/images/note1/image3.jpg" alt="Image 3" />
+            `;
+            document.body.appendChild(container);
+            
+            // Create gallery from container
+            const items = await galleryManager.createGalleryFromContainer(container);
+            
+            expect(items).toHaveLength(3);
+            expect(items[0].src).toBe('/api/images/note1/image1.jpg');
+            expect(items[0].alt).toBe('Image 1');
+            expect(items[0].index).toBe(0);
+        });
+        
+        it('should extract captions from figure elements', async () => {
+            const container = document.createElement('div');
+            container.innerHTML = `
+                <figure>
+                    <img src="/api/images/note1/image1.jpg" alt="Image 1" />
+                    <figcaption>This is a caption</figcaption>
+                </figure>
+            `;
+            document.body.appendChild(container);
+            
+            const items = await galleryManager.createGalleryFromContainer(container);
+            
+            expect(items).toHaveLength(1);
+            expect(items[0].caption).toBe('This is a caption');
+        });
+        
+        it('should handle images without dimensions', async () => {
+            const container = document.createElement('div');
+            container.innerHTML = `<img src="/api/images/note1/image1.jpg" alt="Image 1" />`;
+            document.body.appendChild(container);
+            
+            const items = await galleryManager.createGalleryFromContainer(container);
+            
+            expect(items).toHaveLength(1);
+            expect(items[0].width).toBe(800); // From mocked getImageDimensions
+            expect(items[0].height).toBe(600);
+            expect(mediaViewer.getImageDimensions).toHaveBeenCalledWith('/api/images/note1/image1.jpg');
+        });
+    });
+    
+    describe('Gallery Opening', () => {
+        it('should open gallery with multiple items', () => {
+            const callbacks: MediaViewerCallbacks = {
+                onOpen: vi.fn(),
+                onClose: vi.fn(),
+                onChange: vi.fn()
+            };
+            
+            galleryManager.openGallery(mockItems, 0, {}, callbacks);
+            
+            expect(mediaViewer.open).toHaveBeenCalledWith(
+                mockItems,
+                0,
+                expect.objectContaining({
+                    loop: true,
+                    allowPanToNext: true,
+                    preload: [2, 2]
+                }),
+                expect.objectContaining({
+                    onOpen: expect.any(Function),
+                    onClose: expect.any(Function),
+                    onChange: expect.any(Function)
+                })
+            );
+        });
+        
+        it('should handle empty items array', () => {
+            galleryManager.openGallery([], 0);
+            expect(mediaViewer.open).not.toHaveBeenCalled();
+        });
+        
+        it('should apply custom configuration', () => {
+            const config: GalleryConfig = {
+                showThumbnails: false,
+                autoPlay: true,
+                slideInterval: 5000,
+                loop: false
+            };
+            
+            galleryManager.openGallery(mockItems, 0, config);
+            
+            expect(mediaViewer.open).toHaveBeenCalledWith(
+                mockItems,
+                0,
+                expect.objectContaining({
+                    loop: false
+                }),
+                expect.any(Object)
+            );
+        });
+    });
+    
+    describe('Gallery Navigation', () => {
+        beforeEach(() => {
+            // Open a gallery first
+            galleryManager.openGallery(mockItems, 0);
+        });
+        
+        it('should navigate to next slide', () => {
+            galleryManager.nextSlide();
+            expect(mediaViewer.next).toHaveBeenCalled();
+        });
+        
+        it('should navigate to previous slide', () => {
+            galleryManager.previousSlide();
+            expect(mediaViewer.prev).toHaveBeenCalled();
+        });
+        
+        it('should go to specific slide', () => {
+            galleryManager.goToSlide(2);
+            expect(mediaViewer.goTo).toHaveBeenCalledWith(2);
+        });
+        
+        it('should not navigate to invalid slide index', () => {
+            const state = galleryManager.getGalleryState();
+            if (state) {
+                // Try to go to invalid index
+                galleryManager.goToSlide(-1);
+                expect(mediaViewer.goTo).not.toHaveBeenCalled();
+                
+                galleryManager.goToSlide(10);
+                expect(mediaViewer.goTo).not.toHaveBeenCalled();
+            }
+        });
+    });
+    
+    describe('Slideshow Functionality', () => {
+        beforeEach(() => {
+            vi.useFakeTimers();
+            galleryManager.openGallery(mockItems, 0, { autoPlay: false });
+        });
+        
+        afterEach(() => {
+            vi.useRealTimers();
+        });
+        
+        it('should start slideshow', () => {
+            const state = galleryManager.getGalleryState();
+            expect(state?.isPlaying).toBe(false);
+            
+            galleryManager.startSlideshow();
+            
+            const updatedState = galleryManager.getGalleryState();
+            expect(updatedState?.isPlaying).toBe(true);
+        });
+        
+        it('should stop slideshow', () => {
+            galleryManager.startSlideshow();
+            galleryManager.stopSlideshow();
+            
+            const state = galleryManager.getGalleryState();
+            expect(state?.isPlaying).toBe(false);
+        });
+        
+        it('should toggle slideshow', () => {
+            const initialState = galleryManager.getGalleryState();
+            expect(initialState?.isPlaying).toBe(false);
+            
+            galleryManager.toggleSlideshow();
+            expect(galleryManager.getGalleryState()?.isPlaying).toBe(true);
+            
+            galleryManager.toggleSlideshow();
+            expect(galleryManager.getGalleryState()?.isPlaying).toBe(false);
+        });
+        
+        it('should advance slides automatically in slideshow', () => {
+            galleryManager.startSlideshow();
+            
+            // Fast-forward time
+            vi.advanceTimersByTime(4000); // Default interval
+            
+            expect(mediaViewer.goTo).toHaveBeenCalledWith(1);
+        });
+        
+        it('should update slideshow interval', () => {
+            galleryManager.startSlideshow();
+            galleryManager.updateSlideshowInterval(5000);
+            
+            const state = galleryManager.getGalleryState();
+            expect(state?.config.slideInterval).toBe(5000);
+        });
+    });
+    
+    describe('Gallery State', () => {
+        it('should track gallery state', () => {
+            expect(galleryManager.getGalleryState()).toBeNull();
+            
+            galleryManager.openGallery(mockItems, 1);
+            
+            const state = galleryManager.getGalleryState();
+            expect(state).not.toBeNull();
+            expect(state?.items).toEqual(mockItems);
+            expect(state?.currentIndex).toBe(1);
+        });
+        
+        it('should check if gallery is open', () => {
+            expect(galleryManager.isGalleryOpen()).toBe(false);
+            
+            vi.mocked(mediaViewer.isOpen).mockReturnValue(true);
+            galleryManager.openGallery(mockItems, 0);
+            
+            expect(galleryManager.isGalleryOpen()).toBe(true);
+        });
+    });
+    
+    describe('Gallery Cleanup', () => {
+        it('should close gallery on cleanup', () => {
+            galleryManager.openGallery(mockItems, 0);
+            galleryManager.cleanup();
+            
+            expect(mediaViewer.close).toHaveBeenCalled();
+            expect(galleryManager.getGalleryState()).toBeNull();
+        });
+        
+        it('should stop slideshow on close', () => {
+            galleryManager.openGallery(mockItems, 0, { autoPlay: true });
+            
+            const state = galleryManager.getGalleryState();
+            expect(state?.isPlaying).toBe(true);
+            
+            galleryManager.closeGallery();
+            expect(mediaViewer.close).toHaveBeenCalled();
+        });
+    });
+    
+    describe('UI Enhancements', () => {
+        beforeEach(() => {
+            // Create PhotoSwipe container mock
+            const pswpElement = document.createElement('div');
+            pswpElement.className = 'pswp';
+            document.body.appendChild(pswpElement);
+        });
+        
+        it('should add thumbnail strip when enabled', (done) => {
+            galleryManager.openGallery(mockItems, 0, { showThumbnails: true });
+            
+            // Wait for UI setup
+            setTimeout(() => {
+                const thumbnailStrip = document.querySelector('.gallery-thumbnail-strip');
+                expect(thumbnailStrip).toBeTruthy();
+                
+                const thumbnails = document.querySelectorAll('.gallery-thumbnail');
+                expect(thumbnails).toHaveLength(3);
+                
+                done();
+            }, 150);
+        });
+        
+        it('should add slideshow controls', (done) => {
+            galleryManager.openGallery(mockItems, 0);
+            
+            setTimeout(() => {
+                const controls = document.querySelector('.gallery-slideshow-controls');
+                expect(controls).toBeTruthy();
+                
+                const playPauseBtn = document.querySelector('.slideshow-play-pause');
+                expect(playPauseBtn).toBeTruthy();
+                
+                done();
+            }, 150);
+        });
+        
+        it('should add image counter when enabled', (done) => {
+            galleryManager.openGallery(mockItems, 0, { showCounter: true });
+            
+            setTimeout(() => {
+                const counter = document.querySelector('.gallery-counter');
+                expect(counter).toBeTruthy();
+                expect(counter?.textContent).toContain('1');
+                expect(counter?.textContent).toContain('3');
+                
+                done();
+            }, 150);
+        });
+        
+        it('should add keyboard hints', (done) => {
+            galleryManager.openGallery(mockItems, 0);
+            
+            setTimeout(() => {
+                const hints = document.querySelector('.gallery-keyboard-hints');
+                expect(hints).toBeTruthy();
+                expect(hints?.textContent).toContain('Navigate');
+                expect(hints?.textContent).toContain('ESC');
+                
+                done();
+            }, 150);
+        });
+    });
+});

apps/client/src/services/gallery_manager.ts

@@ -0,0 +1,987 @@
+/**
+ * Gallery Manager for PhotoSwipe integration in Trilium Notes
+ * Handles multi-image galleries, slideshow mode, and navigation features
+ */
+
+import mediaViewer, { MediaItem, MediaViewerCallbacks, MediaViewerConfig } from './media_viewer.js';
+import utils from './utils.js';
+import froca from './froca.js';
+import type FNote from '../entities/fnote.js';
+
+/**
+ * Gallery configuration options
+ */
+export interface GalleryConfig {
+    showThumbnails?: boolean;
+    thumbnailHeight?: number;
+    autoPlay?: boolean;
+    slideInterval?: number; // in milliseconds
+    showCounter?: boolean;
+    enableKeyboardNav?: boolean;
+    enableSwipeGestures?: boolean;
+    preloadCount?: number;
+    loop?: boolean;
+}
+
+/**
+ * Gallery item with additional metadata
+ */
+export interface GalleryItem extends MediaItem {
+    noteId?: string;
+    attachmentId?: string;
+    caption?: string;
+    description?: string;
+    index?: number;
+}
+
+/**
+ * Gallery state management
+ */
+interface GalleryState {
+    items: GalleryItem[];
+    currentIndex: number;
+    isPlaying: boolean;
+    slideshowTimer?: number;
+    config: Required<GalleryConfig>;
+}
+
+/**
+ * GalleryManager handles multi-image galleries with slideshow and navigation features
+ */
+class GalleryManager {
+    private static instance: GalleryManager;
+    private currentGallery: GalleryState | null = null;
+    private defaultConfig: Required<GalleryConfig> = {
+        showThumbnails: true,
+        thumbnailHeight: 80,
+        autoPlay: false,
+        slideInterval: 4000,
+        showCounter: true,
+        enableKeyboardNav: true,
+        enableSwipeGestures: true,
+        preloadCount: 2,
+        loop: true
+    };
+    
+    private slideshowCallbacks: Set<() => void> = new Set();
+    private $thumbnailStrip?: JQuery<HTMLElement>;
+    private $slideshowControls?: JQuery<HTMLElement>;
+    
+    // Track all dynamically created elements for proper cleanup
+    private createdElements: Map<string, HTMLElement | JQuery<HTMLElement>> = new Map();
+    private setupTimeout?: number;
+
+    private constructor() {
+        // Cleanup on window unload
+        window.addEventListener('beforeunload', () => this.cleanup());
+    }
+
+    /**
+     * Get singleton instance
+     */
+    static getInstance(): GalleryManager {
+        if (!GalleryManager.instance) {
+            GalleryManager.instance = new GalleryManager();
+        }
+        return GalleryManager.instance;
+    }
+
+    /**
+     * Create gallery from images in a note's content
+     */
+    async createGalleryFromNote(note: FNote, config?: GalleryConfig): Promise<GalleryItem[]> {
+        const items: GalleryItem[] = [];
+        
+        try {
+            // Parse note content to find images
+            const parser = new DOMParser();
+            const content = await note.getContent();
+            const doc = parser.parseFromString(content || '', 'text/html');
+            const images = doc.querySelectorAll('img');
+            
+            for (let i = 0; i < images.length; i++) {
+                const img = images[i];
+                const src = img.getAttribute('src');
+                
+                if (!src) continue;
+                
+                // Convert relative URLs to absolute
+                const absoluteSrc = this.resolveImageSrc(src, note.noteId);
+                
+                const item: GalleryItem = {
+                    src: absoluteSrc,
+                    alt: img.getAttribute('alt') || `Image ${i + 1} from ${note.title}`,
+                    title: img.getAttribute('title') || img.getAttribute('alt') || undefined,
+                    caption: img.getAttribute('data-caption') || undefined,
+                    noteId: note.noteId,
+                    index: i,
+                    width: parseInt(img.getAttribute('width') || '0') || undefined,
+                    height: parseInt(img.getAttribute('height') || '0') || undefined
+                };
+                
+                // Try to get thumbnail from data attribute or create one
+                const thumbnailSrc = img.getAttribute('data-thumbnail');
+                if (thumbnailSrc) {
+                    item.msrc = this.resolveImageSrc(thumbnailSrc, note.noteId);
+                }
+                
+                items.push(item);
+            }
+            
+            // Also check for image attachments
+            const attachmentItems = await this.getAttachmentImages(note);
+            items.push(...attachmentItems);
+            
+        } catch (error) {
+            console.error('Failed to create gallery from note:', error);
+        }
+        
+        return items;
+    }
+
+    /**
+     * Get image attachments from a note
+     */
+    private async getAttachmentImages(note: FNote): Promise<GalleryItem[]> {
+        const items: GalleryItem[] = [];
+        
+        try {
+            // Get child notes that are images
+            const childNotes = await note.getChildNotes();
+            
+            for (const childNote of childNotes) {
+                if (childNote.type === 'image') {
+                    const item: GalleryItem = {
+                        src: utils.createImageSrcUrl(childNote),
+                        alt: childNote.title,
+                        title: childNote.title,
+                        noteId: childNote.noteId,
+                        index: items.length
+                    };
+                    
+                    items.push(item);
+                }
+            }
+        } catch (error) {
+            console.error('Failed to get attachment images:', error);
+        }
+        
+        return items;
+    }
+
+    /**
+     * Create gallery from a container element with images
+     */
+    async createGalleryFromContainer(
+        container: HTMLElement | JQuery<HTMLElement>, 
+        selector: string = 'img',
+        config?: GalleryConfig
+    ): Promise<GalleryItem[]> {
+        const $container = $(container);
+        const images = $container.find(selector);
+        const items: GalleryItem[] = [];
+        
+        for (let i = 0; i < images.length; i++) {
+            const img = images[i] as HTMLImageElement;
+            
+            const item: GalleryItem = {
+                src: img.src,
+                alt: img.alt || `Image ${i + 1}`,
+                title: img.title || img.alt || undefined,
+                element: img,
+                index: i,
+                width: img.naturalWidth || undefined,
+                height: img.naturalHeight || undefined
+            };
+            
+            // Try to extract caption from nearby elements
+            const $img = $(img);
+            const $figure = $img.closest('figure');
+            if ($figure.length) {
+                const $caption = $figure.find('figcaption');
+                if ($caption.length) {
+                    item.caption = $caption.text();
+                }
+            }
+            
+            // Check for data attributes
+            item.noteId = $img.data('note-id');
+            item.attachmentId = $img.data('attachment-id');
+            
+            items.push(item);
+        }
+        
+        return items;
+    }
+
+    /**
+     * Open gallery with specified items
+     */
+    openGallery(
+        items: GalleryItem[], 
+        startIndex: number = 0, 
+        config?: GalleryConfig,
+        callbacks?: MediaViewerCallbacks
+    ): void {
+        if (!items || items.length === 0) {
+            console.warn('No items provided to gallery');
+            return;
+        }
+        
+        // Close any existing gallery
+        this.closeGallery();
+        
+        // Merge configuration
+        const finalConfig = { ...this.defaultConfig, ...config };
+        
+        // Initialize gallery state
+        this.currentGallery = {
+            items,
+            currentIndex: startIndex,
+            isPlaying: finalConfig.autoPlay,
+            config: finalConfig
+        };
+        
+        // Enhanced PhotoSwipe configuration for gallery
+        const photoSwipeConfig: Partial<MediaViewerConfig> = {
+            bgOpacity: 0.95,
+            showHideOpacity: true,
+            allowPanToNext: true,
+            spacing: 0.12,
+            loop: finalConfig.loop,
+            arrowKeys: finalConfig.enableKeyboardNav,
+            pinchToClose: finalConfig.enableSwipeGestures,
+            closeOnVerticalDrag: finalConfig.enableSwipeGestures,
+            preload: [finalConfig.preloadCount, finalConfig.preloadCount],
+            wheelToZoom: true,
+            // Enable mobile and accessibility enhancements
+            mobileA11y: {
+                touch: {
+                    hapticFeedback: true,
+                    multiTouchEnabled: true
+                },
+                a11y: {
+                    enableKeyboardNav: finalConfig.enableKeyboardNav,
+                    enableScreenReaderAnnouncements: true,
+                    keyboardShortcutsEnabled: true
+                },
+                mobileUI: {
+                    bottomSheetEnabled: true,
+                    adaptiveToolbar: true,
+                    swipeIndicators: true,
+                    gestureHints: true
+                },
+                performance: {
+                    adaptiveQuality: true,
+                    batteryOptimization: true
+                }
+            }
+        };
+        
+        // Enhanced callbacks
+        const enhancedCallbacks: MediaViewerCallbacks = {
+            onOpen: () => {
+                this.onGalleryOpen();
+                callbacks?.onOpen?.();
+            },
+            onClose: () => {
+                this.onGalleryClose();
+                callbacks?.onClose?.();
+            },
+            onChange: (index) => {
+                this.onSlideChange(index);
+                callbacks?.onChange?.(index);
+            },
+            onImageLoad: callbacks?.onImageLoad,
+            onImageError: callbacks?.onImageError
+        };
+        
+        // Open with media viewer
+        mediaViewer.open(items, startIndex, photoSwipeConfig, enhancedCallbacks);
+        
+        // Setup gallery UI enhancements
+        this.setupGalleryUI();
+        
+        // Start slideshow if configured
+        if (finalConfig.autoPlay) {
+            this.startSlideshow();
+        }
+    }
+
+    /**
+     * Setup gallery UI enhancements
+     */
+    private setupGalleryUI(): void {
+        if (!this.currentGallery) return;
+        
+        // Clear any existing timeout
+        if (this.setupTimeout) {
+            clearTimeout(this.setupTimeout);
+        }
+        
+        // Add gallery-specific UI elements to PhotoSwipe
+        this.setupTimeout = window.setTimeout(() => {
+            // Validate gallery is still open before manipulating DOM
+            if (!this.currentGallery || !this.isGalleryOpen()) {
+                return;
+            }
+            
+            // PhotoSwipe needs a moment to initialize
+            const pswpElement = document.querySelector('.pswp');
+            if (!pswpElement) return;
+            
+            // Add thumbnail strip if enabled
+            if (this.currentGallery.config.showThumbnails) {
+                this.addThumbnailStrip(pswpElement);
+            }
+            
+            // Add slideshow controls
+            this.addSlideshowControls(pswpElement);
+            
+            // Add image counter if enabled
+            if (this.currentGallery.config.showCounter) {
+                this.addImageCounter(pswpElement);
+            }
+            
+            // Add keyboard hints
+            this.addKeyboardHints(pswpElement);
+        }, 100);
+    }
+
+    /**
+     * Add thumbnail strip navigation
+     */
+    private addThumbnailStrip(container: Element): void {
+        if (!this.currentGallery) return;
+        
+        // Create thumbnail strip container safely using DOM APIs
+        const stripDiv = document.createElement('div');
+        stripDiv.className = 'gallery-thumbnail-strip';
+        stripDiv.setAttribute('style', `
+            position: absolute;
+            bottom: 60px;
+            left: 50%;
+            transform: translateX(-50%);
+            display: flex;
+            gap: 8px;
+            padding: 10px;
+            background: rgba(0, 0, 0, 0.7);
+            border-radius: 8px;
+            max-width: 90%;
+            overflow-x: auto;
+            z-index: 100;
+        `);
+        
+        // Create thumbnails safely
+        this.currentGallery.items.forEach((item, index) => {
+            const thumbDiv = document.createElement('div');
+            thumbDiv.className = 'gallery-thumbnail';
+            thumbDiv.dataset.index = index.toString();
+            thumbDiv.setAttribute('style', `
+                width: ${this.currentGallery!.config.thumbnailHeight}px;
+                height: ${this.currentGallery!.config.thumbnailHeight}px;
+                cursor: pointer;
+                border: 2px solid ${index === this.currentGallery!.currentIndex ? '#fff' : 'transparent'};
+                border-radius: 4px;
+                overflow: hidden;
+                flex-shrink: 0;
+                opacity: ${index === this.currentGallery!.currentIndex ? '1' : '0.6'};
+                transition: all 0.2s;
+            `);
+            
+            const img = document.createElement('img');
+            // Sanitize src URLs
+            const src = this.sanitizeUrl(item.msrc || item.src);
+            img.src = src;
+            // Use textContent for safe text insertion
+            img.alt = this.sanitizeText(item.alt || '');
+            img.setAttribute('style', `
+                width: 100%;
+                height: 100%;
+                object-fit: cover;
+            `);
+            
+            thumbDiv.appendChild(img);
+            stripDiv.appendChild(thumbDiv);
+        });
+        
+        this.$thumbnailStrip = $(stripDiv);
+        $(container).append(this.$thumbnailStrip);
+        this.createdElements.set('thumbnailStrip', this.$thumbnailStrip);
+        
+        // Handle thumbnail clicks
+        this.$thumbnailStrip.on('click', '.gallery-thumbnail', (e) => {
+            const index = parseInt($(e.currentTarget).data('index'));
+            this.goToSlide(index);
+        });
+        
+        // Handle hover effect
+        this.$thumbnailStrip.on('mouseenter', '.gallery-thumbnail', (e) => {
+            if (!$(e.currentTarget).hasClass('active')) {
+                $(e.currentTarget).css('opacity', '0.8');
+            }
+        });
+        
+        this.$thumbnailStrip.on('mouseleave', '.gallery-thumbnail', (e) => {
+            if (!$(e.currentTarget).hasClass('active')) {
+                $(e.currentTarget).css('opacity', '0.6');
+            }
+        });
+    }
+
+    /**
+     * Sanitize text content to prevent XSS
+     */
+    private sanitizeText(text: string): string {
+        // Remove any HTML tags and entities
+        const div = document.createElement('div');
+        div.textContent = text;
+        return div.innerHTML;
+    }
+    
+    /**
+     * Sanitize URL to prevent XSS
+     */
+    private sanitizeUrl(url: string): string {
+        // Only allow safe protocols
+        const allowedProtocols = ['http:', 'https:', 'data:'];
+        try {
+            const urlObj = new URL(url, window.location.href);
+            
+            // Special validation for data URLs
+            if (urlObj.protocol === 'data:') {
+                // Only allow image MIME types for data URLs
+                const allowedImageTypes = [
+                    'data:image/jpeg',
+                    'data:image/jpg',
+                    'data:image/png',
+                    'data:image/gif',
+                    'data:image/webp',
+                    'data:image/svg+xml',
+                    'data:image/bmp'
+                ];
+                
+                // Check if data URL starts with an allowed image type
+                const isAllowedImage = allowedImageTypes.some(type => 
+                    url.toLowerCase().startsWith(type)
+                );
+                
+                if (!isAllowedImage) {
+                    console.warn('Rejected non-image data URL:', url.substring(0, 50));
+                    return '';
+                }
+                
+                // Additional check for base64 encoding
+                if (!url.includes(';base64,') && !url.includes(';charset=')) {
+                    console.warn('Rejected data URL with invalid encoding');
+                    return '';
+                }
+            } else if (!allowedProtocols.includes(urlObj.protocol)) {
+                return '';
+            }
+            
+            return urlObj.href;
+        } catch {
+            // If URL parsing fails, check if it's a relative path
+            if (url.startsWith('/') || url.startsWith('api/')) {
+                return url;
+            }
+            return '';
+        }
+    }
+    
+    /**
+     * Add slideshow controls
+     */
+    private addSlideshowControls(container: Element): void {
+        if (!this.currentGallery) return;
+        
+        const controlsHtml = `
+            <div class="gallery-slideshow-controls" style="
+                position: absolute;
+                top: 20px;
+                right: 20px;
+                display: flex;
+                gap: 10px;
+                z-index: 100;
+            ">
+                <button class="slideshow-play-pause" style="
+                    background: rgba(255, 255, 255, 0.9);
+                    border: none;
+                    border-radius: 4px;
+                    width: 44px;
+                    height: 44px;
+                    cursor: pointer;
+                    display: flex;
+                    align-items: center;
+                    justify-content: center;
+                    font-size: 20px;
+                " aria-label="${this.currentGallery.isPlaying ? 'Pause slideshow' : 'Play slideshow'}">
+                    <i class="bx ${this.currentGallery.isPlaying ? 'bx-pause' : 'bx-play'}"></i>
+                </button>
+                
+                <button class="slideshow-settings" style="
+                    background: rgba(255, 255, 255, 0.9);
+                    border: none;
+                    border-radius: 4px;
+                    width: 44px;
+                    height: 44px;
+                    cursor: pointer;
+                    display: flex;
+                    align-items: center;
+                    justify-content: center;
+                    font-size: 20px;
+                " aria-label="Slideshow settings">
+                    <i class="bx bx-cog"></i>
+                </button>
+            </div>
+            
+            <div class="slideshow-interval-selector" style="
+                position: absolute;
+                top: 80px;
+                right: 20px;
+                background: rgba(0, 0, 0, 0.8);
+                color: white;
+                padding: 10px;
+                border-radius: 4px;
+                display: none;
+                z-index: 101;
+            ">
+                <label style="display: block; margin-bottom: 5px;">Slide interval:</label>
+                <select class="interval-select" style="
+                    background: rgba(255, 255, 255, 0.1);
+                    color: white;
+                    border: 1px solid rgba(255, 255, 255, 0.3);
+                    padding: 4px;
+                    border-radius: 3px;
+                ">
+                    <option value="3000">3 seconds</option>
+                    <option value="4000" selected>4 seconds</option>
+                    <option value="5000">5 seconds</option>
+                    <option value="7000">7 seconds</option>
+                    <option value="10000">10 seconds</option>
+                </select>
+            </div>
+        `;
+        
+        this.$slideshowControls = $(controlsHtml);
+        $(container).append(this.$slideshowControls);
+        this.createdElements.set('slideshowControls', this.$slideshowControls);
+        
+        // Handle play/pause button
+        this.$slideshowControls.find('.slideshow-play-pause').on('click', () => {
+            this.toggleSlideshow();
+        });
+        
+        // Handle settings button
+        this.$slideshowControls.find('.slideshow-settings').on('click', () => {
+            const $selector = this.$slideshowControls?.find('.slideshow-interval-selector');
+            $selector?.toggle();
+        });
+        
+        // Handle interval change
+        this.$slideshowControls.find('.interval-select').on('change', (e) => {
+            const interval = parseInt($(e.target).val() as string);
+            this.updateSlideshowInterval(interval);
+        });
+    }
+
+    /**
+     * Add image counter
+     */
+    private addImageCounter(container: Element): void {
+        if (!this.currentGallery) return;
+        
+        // Create counter element safely
+        const counterDiv = document.createElement('div');
+        counterDiv.className = 'gallery-counter';
+        counterDiv.setAttribute('style', `
+            position: absolute;
+            top: 20px;
+            left: 20px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 8px 12px;
+            border-radius: 4px;
+            font-size: 14px;
+            z-index: 100;
+        `);
+        
+        const currentSpan = document.createElement('span');
+        currentSpan.className = 'current-index';
+        currentSpan.textContent = String(this.currentGallery.currentIndex + 1);
+        
+        const separatorSpan = document.createElement('span');
+        separatorSpan.textContent = ' / ';
+        
+        const totalSpan = document.createElement('span');
+        totalSpan.className = 'total-count';
+        totalSpan.textContent = String(this.currentGallery.items.length);
+        
+        counterDiv.appendChild(currentSpan);
+        counterDiv.appendChild(separatorSpan);
+        counterDiv.appendChild(totalSpan);
+        
+        container.appendChild(counterDiv);
+        this.createdElements.set('counter', counterDiv);
+    }
+
+    /**
+     * Add keyboard hints overlay
+     */
+    private addKeyboardHints(container: Element): void {
+        // Create hints element safely
+        const hintsDiv = document.createElement('div');
+        hintsDiv.className = 'gallery-keyboard-hints';
+        hintsDiv.setAttribute('style', `
+            position: absolute;
+            bottom: 20px;
+            left: 20px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 8px 12px;
+            border-radius: 4px;
+            font-size: 12px;
+            opacity: 0;
+            transition: opacity 0.3s;
+            z-index: 100;
+        `);
+        
+        // Create hint items
+        const hints = [
+            { key: '←/→', action: 'Navigate' },
+            { key: 'Space', action: 'Play/Pause' },
+            { key: 'ESC', action: 'Close' }
+        ];
+        
+        hints.forEach(hint => {
+            const hintItem = document.createElement('div');
+            const kbd = document.createElement('kbd');
+            kbd.style.cssText = 'background: rgba(255,255,255,0.2); padding: 2px 4px; border-radius: 2px;';
+            kbd.textContent = hint.key;
+            hintItem.appendChild(kbd);
+            hintItem.appendChild(document.createTextNode(' ' + hint.action));
+            hintsDiv.appendChild(hintItem);
+        });
+        
+        container.appendChild(hintsDiv);
+        this.createdElements.set('keyboardHints', hintsDiv);
+        
+        const $hints = $(hintsDiv);
+        
+        // Show hints on hover with scoped selector
+        const handleMouseEnter = () => {
+            if (this.currentGallery) {
+                $hints.css('opacity', '0.6');
+            }
+        };
+        
+        const handleMouseLeave = () => {
+            $hints.css('opacity', '0');
+        };
+        
+        $(container).on('mouseenter.galleryHints', handleMouseEnter);
+        $(container).on('mouseleave.galleryHints', handleMouseLeave);
+        
+        // Track cleanup callback
+        this.slideshowCallbacks.add(() => {
+            $(container).off('.galleryHints');
+        });
+    }
+
+    /**
+     * Handle gallery open event
+     */
+    private onGalleryOpen(): void {
+        // Add keyboard listener for slideshow control
+        const handleKeyDown = (e: KeyboardEvent) => {
+            if (e.key === ' ') {
+                e.preventDefault();
+                this.toggleSlideshow();
+            }
+        };
+        
+        document.addEventListener('keydown', handleKeyDown);
+        this.slideshowCallbacks.add(() => {
+            document.removeEventListener('keydown', handleKeyDown);
+        });
+    }
+
+    /**
+     * Handle gallery close event
+     */
+    private onGalleryClose(): void {
+        this.stopSlideshow();
+        
+        // Clear setup timeout if exists
+        if (this.setupTimeout) {
+            clearTimeout(this.setupTimeout);
+            this.setupTimeout = undefined;
+        }
+        
+        // Cleanup event listeners
+        this.slideshowCallbacks.forEach(callback => callback());
+        this.slideshowCallbacks.clear();
+        
+        // Remove all tracked UI elements
+        this.createdElements.forEach((element, key) => {
+            if (element instanceof HTMLElement) {
+                element.remove();
+            } else if (element instanceof $) {
+                element.remove();
+            }
+        });
+        this.createdElements.clear();
+        
+        // Clear jQuery references
+        this.$thumbnailStrip = undefined;
+        this.$slideshowControls = undefined;
+        
+        // Clear state
+        this.currentGallery = null;
+    }
+
+    /**
+     * Handle slide change event
+     */
+    private onSlideChange(index: number): void {
+        if (!this.currentGallery) return;
+        
+        this.currentGallery.currentIndex = index;
+        
+        // Update thumbnail highlighting
+        if (this.$thumbnailStrip) {
+            this.$thumbnailStrip.find('.gallery-thumbnail').each((i, el) => {
+                const $thumb = $(el);
+                if (i === index) {
+                    $thumb.css({
+                        'border-color': '#fff',
+                        'opacity': '1'
+                    });
+                    
+                    // Scroll thumbnail into view
+                    const thumbLeft = $thumb.position().left;
+                    const thumbWidth = $thumb.outerWidth() || 0;
+                    const stripWidth = this.$thumbnailStrip!.width() || 0;
+                    const scrollLeft = this.$thumbnailStrip!.scrollLeft() || 0;
+                    
+                    if (thumbLeft < 0) {
+                        this.$thumbnailStrip!.scrollLeft(scrollLeft + thumbLeft - 10);
+                    } else if (thumbLeft + thumbWidth > stripWidth) {
+                        this.$thumbnailStrip!.scrollLeft(scrollLeft + (thumbLeft + thumbWidth - stripWidth) + 10);
+                    }
+                } else {
+                    $thumb.css({
+                        'border-color': 'transparent',
+                        'opacity': '0.6'
+                    });
+                }
+            });
+        }
+        
+        // Update counter using tracked element
+        const counterElement = this.createdElements.get('counter');
+        if (counterElement instanceof HTMLElement) {
+            const currentIndexElement = counterElement.querySelector('.current-index');
+            if (currentIndexElement) {
+                currentIndexElement.textContent = String(index + 1);
+            }
+        }
+    }
+
+    /**
+     * Start slideshow
+     */
+    startSlideshow(): void {
+        if (!this.currentGallery || this.currentGallery.isPlaying) return;
+        
+        // Validate gallery state before starting slideshow
+        if (!this.isGalleryOpen() || this.currentGallery.items.length === 0) {
+            console.warn('Cannot start slideshow: gallery not ready');
+            return;
+        }
+        
+        // Ensure PhotoSwipe is ready
+        if (!mediaViewer.isOpen()) {
+            console.warn('Cannot start slideshow: PhotoSwipe not ready');
+            return;
+        }
+        
+        this.currentGallery.isPlaying = true;
+        
+        // Update button icon
+        this.$slideshowControls?.find('.slideshow-play-pause i')
+            .removeClass('bx-play')
+            .addClass('bx-pause');
+        
+        // Start timer
+        this.scheduleNextSlide();
+    }
+
+    /**
+     * Stop slideshow
+     */
+    stopSlideshow(): void {
+        if (!this.currentGallery) return;
+        
+        this.currentGallery.isPlaying = false;
+        
+        // Clear timer
+        if (this.currentGallery.slideshowTimer) {
+            clearTimeout(this.currentGallery.slideshowTimer);
+            this.currentGallery.slideshowTimer = undefined;
+        }
+        
+        // Update button icon
+        this.$slideshowControls?.find('.slideshow-play-pause i')
+            .removeClass('bx-pause')
+            .addClass('bx-play');
+    }
+
+    /**
+     * Toggle slideshow play/pause
+     */
+    toggleSlideshow(): void {
+        if (!this.currentGallery) return;
+        
+        if (this.currentGallery.isPlaying) {
+            this.stopSlideshow();
+        } else {
+            this.startSlideshow();
+        }
+    }
+
+    /**
+     * Schedule next slide in slideshow
+     */
+    private scheduleNextSlide(): void {
+        if (!this.currentGallery || !this.currentGallery.isPlaying) return;
+        
+        // Clear any existing timer
+        if (this.currentGallery.slideshowTimer) {
+            clearTimeout(this.currentGallery.slideshowTimer);
+        }
+        
+        this.currentGallery.slideshowTimer = window.setTimeout(() => {
+            if (!this.currentGallery || !this.currentGallery.isPlaying) return;
+            
+            // Go to next slide
+            const nextIndex = (this.currentGallery.currentIndex + 1) % this.currentGallery.items.length;
+            this.goToSlide(nextIndex);
+            
+            // Schedule next transition
+            this.scheduleNextSlide();
+        }, this.currentGallery.config.slideInterval);
+    }
+
+    /**
+     * Update slideshow interval
+     */
+    updateSlideshowInterval(interval: number): void {
+        if (!this.currentGallery) return;
+        
+        this.currentGallery.config.slideInterval = interval;
+        
+        // Restart slideshow with new interval if playing
+        if (this.currentGallery.isPlaying) {
+            this.stopSlideshow();
+            this.startSlideshow();
+        }
+    }
+
+    /**
+     * Go to specific slide
+     */
+    goToSlide(index: number): void {
+        if (!this.currentGallery) return;
+        
+        if (index >= 0 && index < this.currentGallery.items.length) {
+            mediaViewer.goTo(index);
+        }
+    }
+
+    /**
+     * Navigate to next slide
+     */
+    nextSlide(): void {
+        mediaViewer.next();
+    }
+
+    /**
+     * Navigate to previous slide
+     */
+    previousSlide(): void {
+        mediaViewer.prev();
+    }
+
+    /**
+     * Close gallery
+     */
+    closeGallery(): void {
+        mediaViewer.close();
+    }
+
+    /**
+     * Check if gallery is open
+     */
+    isGalleryOpen(): boolean {
+        return this.currentGallery !== null && mediaViewer.isOpen();
+    }
+
+    /**
+     * Get current gallery state
+     */
+    getGalleryState(): GalleryState | null {
+        return this.currentGallery;
+    }
+
+    /**
+     * Resolve image source URL
+     */
+    private resolveImageSrc(src: string, noteId: string): string {
+        // Handle different image source formats
+        if (src.startsWith('http://') || src.startsWith('https://')) {
+            return src;
+        }
+        
+        if (src.startsWith('api/images/')) {
+            return `/${src}`;
+        }
+        
+        if (src.startsWith('/')) {
+            return src;
+        }
+        
+        // Assume it's a note ID or attachment reference
+        return `/api/images/${noteId}/${src}`;
+    }
+
+    /**
+     * Cleanup resources
+     */
+    cleanup(): void {
+        // Clear any pending timeouts
+        if (this.setupTimeout) {
+            clearTimeout(this.setupTimeout);
+            this.setupTimeout = undefined;
+        }
+        
+        this.closeGallery();
+        
+        // Ensure all elements are removed
+        this.createdElements.forEach((element) => {
+            if (element instanceof HTMLElement) {
+                element.remove();
+            } else if (element instanceof $) {
+                element.remove();
+            }
+        });
+        this.createdElements.clear();
+        
+        this.slideshowCallbacks.clear();
+        this.currentGallery = null;
+    }
+}
+
+// Export singleton instance
+export default GalleryManager.getInstance();

apps/client/src/services/image_annotations.ts

@@ -0,0 +1,597 @@
+/**
+ * Image Annotations Module for PhotoSwipe
+ * Provides ability to add, display, and manage annotations on images
+ */
+
+import froca from './froca.js';
+import server from './server.js';
+import type FNote from '../entities/fnote.js';
+import type FAttribute from '../entities/fattribute.js';
+import { ImageValidator, withErrorBoundary, ImageError, ImageErrorType } from './image_error_handler.js';
+
+/**
+ * Annotation position and data
+ */
+export interface ImageAnnotation {
+    id: string;
+    noteId: string;
+    x: number; // Percentage from left (0-100)
+    y: number; // Percentage from top (0-100)
+    text: string;
+    author?: string;
+    created: Date;
+    modified?: Date;
+    color?: string;
+    icon?: string;
+    type?: 'comment' | 'marker' | 'region';
+    width?: number; // For region type
+    height?: number; // For region type
+}
+
+/**
+ * Annotation configuration
+ */
+export interface AnnotationConfig {
+    enableAnnotations: boolean;
+    showByDefault: boolean;
+    allowEditing: boolean;
+    defaultColor: string;
+    defaultIcon: string;
+}
+
+/**
+ * ImageAnnotationsService manages image annotations using Trilium's attribute system
+ */
+class ImageAnnotationsService {
+    private static instance: ImageAnnotationsService;
+    private activeAnnotations: Map<string, ImageAnnotation[]> = new Map();
+    private annotationElements: Map<string, HTMLElement> = new Map();
+    private isEditMode: boolean = false;
+    private selectedAnnotation: ImageAnnotation | null = null;
+    
+    private config: AnnotationConfig = {
+        enableAnnotations: true,
+        showByDefault: true,
+        allowEditing: true,
+        defaultColor: '#ffeb3b',
+        defaultIcon: 'bx-comment'
+    };
+    
+    // Annotation attribute prefix in Trilium
+    private readonly ANNOTATION_PREFIX = 'imageAnnotation';
+
+    private constructor() {}
+
+    static getInstance(): ImageAnnotationsService {
+        if (!ImageAnnotationsService.instance) {
+            ImageAnnotationsService.instance = new ImageAnnotationsService();
+        }
+        return ImageAnnotationsService.instance;
+    }
+
+    /**
+     * Load annotations for an image note
+     */
+    async loadAnnotations(noteId: string): Promise<ImageAnnotation[]> {
+        return await withErrorBoundary(async () => {
+            // Validate note ID
+            if (!noteId || typeof noteId !== 'string') {
+                throw new ImageError(
+                    ImageErrorType.INVALID_INPUT,
+                    'Invalid note ID provided'
+                );
+            }
+            const note = await froca.getNote(noteId);
+            if (!note) return [];
+
+            const attributes = note.getAttributes();
+            const annotations: ImageAnnotation[] = [];
+
+            // Parse annotation attributes
+            for (const attr of attributes) {
+                if (attr.name.startsWith(this.ANNOTATION_PREFIX)) {
+                    try {
+                        const annotationData = JSON.parse(attr.value);
+                        annotations.push({
+                            ...annotationData,
+                            id: attr.attributeId,
+                            noteId: noteId,
+                            created: new Date(annotationData.created),
+                            modified: annotationData.modified ? new Date(annotationData.modified) : undefined
+                        });
+                    } catch (error) {
+                        console.error('Failed to parse annotation:', error);
+                    }
+                }
+            }
+
+            // Sort by creation date
+            annotations.sort((a, b) => a.created.getTime() - b.created.getTime());
+            
+            this.activeAnnotations.set(noteId, annotations);
+            return annotations;
+        }) || [];
+    }
+
+    /**
+     * Save a new annotation
+     */
+    async saveAnnotation(annotation: Omit<ImageAnnotation, 'id' | 'created'>): Promise<ImageAnnotation> {
+        return await withErrorBoundary(async () => {
+            // Validate annotation data
+            if (!annotation.text || !annotation.noteId) {
+                throw new ImageError(
+                    ImageErrorType.INVALID_INPUT,
+                    'Invalid annotation data'
+                );
+            }
+            
+            // Sanitize text
+            annotation.text = this.sanitizeText(annotation.text);
+            const note = await froca.getNote(annotation.noteId);
+            if (!note) {
+                throw new Error('Note not found');
+            }
+
+            const newAnnotation: ImageAnnotation = {
+                ...annotation,
+                id: this.generateId(),
+                created: new Date()
+            };
+
+            // Save as note attribute
+            const attributeName = `${this.ANNOTATION_PREFIX}_${newAnnotation.id}`;
+            const attributeValue = JSON.stringify({
+                x: newAnnotation.x,
+                y: newAnnotation.y,
+                text: newAnnotation.text,
+                author: newAnnotation.author,
+                created: newAnnotation.created.toISOString(),
+                color: newAnnotation.color,
+                icon: newAnnotation.icon,
+                type: newAnnotation.type,
+                width: newAnnotation.width,
+                height: newAnnotation.height
+            });
+
+            await server.put(`notes/${annotation.noteId}/attributes`, {
+                attributes: [{
+                    type: 'label',
+                    name: attributeName,
+                    value: attributeValue
+                }]
+            });
+
+            // Update cache
+            const annotations = this.activeAnnotations.get(annotation.noteId) || [];
+            annotations.push(newAnnotation);
+            this.activeAnnotations.set(annotation.noteId, annotations);
+
+            return newAnnotation;
+        }) as Promise<ImageAnnotation>;
+    }
+
+    /**
+     * Update an existing annotation
+     */
+    async updateAnnotation(annotation: ImageAnnotation): Promise<void> {
+        try {
+            const note = await froca.getNote(annotation.noteId);
+            if (!note) {
+                throw new Error('Note not found');
+            }
+
+            annotation.modified = new Date();
+
+            // Update attribute
+            const attributeName = `${this.ANNOTATION_PREFIX}_${annotation.id}`;
+            const attributeValue = JSON.stringify({
+                x: annotation.x,
+                y: annotation.y,
+                text: annotation.text,
+                author: annotation.author,
+                created: annotation.created.toISOString(),
+                modified: annotation.modified.toISOString(),
+                color: annotation.color,
+                icon: annotation.icon,
+                type: annotation.type,
+                width: annotation.width,
+                height: annotation.height
+            });
+
+            // Find and update the attribute
+            const attributes = note.getAttributes();
+            const attr = attributes.find(a => a.name === attributeName);
+            
+            if (attr) {
+                await server.put(`notes/${annotation.noteId}/attributes/${attr.attributeId}`, {
+                    value: attributeValue
+                });
+            }
+
+            // Update cache
+            const annotations = this.activeAnnotations.get(annotation.noteId) || [];
+            const index = annotations.findIndex(a => a.id === annotation.id);
+            if (index !== -1) {
+                annotations[index] = annotation;
+                this.activeAnnotations.set(annotation.noteId, annotations);
+            }
+        } catch (error) {
+            console.error('Failed to update annotation:', error);
+            throw error;
+        }
+    }
+
+    /**
+     * Delete an annotation
+     */
+    async deleteAnnotation(noteId: string, annotationId: string): Promise<void> {
+        try {
+            const note = await froca.getNote(noteId);
+            if (!note) return;
+
+            const attributeName = `${this.ANNOTATION_PREFIX}_${annotationId}`;
+            const attributes = note.getAttributes();
+            const attr = attributes.find(a => a.name === attributeName);
+            
+            if (attr) {
+                await server.remove(`notes/${noteId}/attributes/${attr.attributeId}`);
+            }
+
+            // Update cache
+            const annotations = this.activeAnnotations.get(noteId) || [];
+            const filtered = annotations.filter(a => a.id !== annotationId);
+            this.activeAnnotations.set(noteId, filtered);
+
+            // Remove element if exists
+            const element = this.annotationElements.get(annotationId);
+            if (element) {
+                element.remove();
+                this.annotationElements.delete(annotationId);
+            }
+        } catch (error) {
+            console.error('Failed to delete annotation:', error);
+            throw error;
+        }
+    }
+
+    /**
+     * Render annotations on an image container
+     */
+    renderAnnotations(container: HTMLElement, noteId: string, imageElement: HTMLImageElement): void {
+        const annotations = this.activeAnnotations.get(noteId) || [];
+        
+        // Clear existing annotation elements
+        this.clearAnnotationElements();
+
+        // Create annotation overlay container
+        const overlay = this.createOverlayContainer(container, imageElement);
+
+        // Render each annotation
+        annotations.forEach(annotation => {
+            const element = this.createAnnotationElement(annotation, overlay);
+            this.annotationElements.set(annotation.id, element);
+        });
+
+        // Add click handler for creating new annotations
+        if (this.config.allowEditing && this.isEditMode) {
+            this.setupAnnotationCreation(overlay, noteId);
+        }
+        
+        // Add ARIA attributes for accessibility
+        overlay.setAttribute('role', 'img');
+        overlay.setAttribute('aria-label', 'Image with annotations');
+    }
+
+    /**
+     * Create overlay container for annotations
+     */
+    private createOverlayContainer(container: HTMLElement, imageElement: HTMLImageElement): HTMLElement {
+        let overlay = container.querySelector('.annotation-overlay') as HTMLElement;
+        
+        if (!overlay) {
+            overlay = document.createElement('div');
+            overlay.className = 'annotation-overlay';
+            overlay.style.cssText = `
+                position: absolute;
+                top: 0;
+                left: 0;
+                width: 100%;
+                height: 100%;
+                pointer-events: ${this.isEditMode ? 'auto' : 'none'};
+                z-index: 10;
+            `;
+            
+            // Position overlay over the image
+            const rect = imageElement.getBoundingClientRect();
+            const containerRect = container.getBoundingClientRect();
+            overlay.style.top = `${rect.top - containerRect.top}px`;
+            overlay.style.left = `${rect.left - containerRect.left}px`;
+            overlay.style.width = `${rect.width}px`;
+            overlay.style.height = `${rect.height}px`;
+            
+            container.appendChild(overlay);
+        }
+
+        return overlay;
+    }
+
+    /**
+     * Create annotation element
+     */
+    private createAnnotationElement(annotation: ImageAnnotation, container: HTMLElement): HTMLElement {
+        const element = document.createElement('div');
+        element.className = `annotation-marker annotation-${annotation.type || 'comment'}`;
+        element.dataset.annotationId = annotation.id;
+        
+        // Position based on percentage
+        element.style.cssText = `
+            position: absolute;
+            left: ${annotation.x}%;
+            top: ${annotation.y}%;
+            transform: translate(-50%, -50%);
+            cursor: pointer;
+            z-index: 20;
+            pointer-events: auto;
+        `;
+
+        // Create marker based on type
+        if (annotation.type === 'region') {
+            // Region annotation
+            element.style.cssText += `
+                width: ${annotation.width || 20}%;
+                height: ${annotation.height || 20}%;
+                border: 2px solid ${annotation.color || this.config.defaultColor};
+                background: ${annotation.color || this.config.defaultColor}33;
+                border-radius: 4px;
+            `;
+        } else {
+            // Point annotation
+            const marker = document.createElement('div');
+            marker.style.cssText = `
+                width: 24px;
+                height: 24px;
+                background: ${annotation.color || this.config.defaultColor};
+                border-radius: 50%;
+                display: flex;
+                align-items: center;
+                justify-content: center;
+                box-shadow: 0 2px 4px rgba(0,0,0,0.2);
+            `;
+            
+            const icon = document.createElement('i');
+            icon.className = `bx ${annotation.icon || this.config.defaultIcon}`;
+            icon.style.cssText = `
+                color: #333;
+                font-size: 14px;
+            `;
+            
+            marker.appendChild(icon);
+            element.appendChild(marker);
+            
+            // Add ARIA attributes for accessibility
+            element.setAttribute('role', 'button');
+            element.setAttribute('aria-label', `Annotation: ${this.sanitizeText(annotation.text)}`);
+            element.setAttribute('tabindex', '0');
+        }
+
+        // Add tooltip
+        const tooltip = document.createElement('div');
+        tooltip.className = 'annotation-tooltip';
+        tooltip.style.cssText = `
+            position: absolute;
+            bottom: 100%;
+            left: 50%;
+            transform: translateX(-50%);
+            background: rgba(0,0,0,0.9);
+            color: white;
+            padding: 8px 12px;
+            border-radius: 4px;
+            font-size: 12px;
+            white-space: nowrap;
+            max-width: 200px;
+            pointer-events: none;
+            opacity: 0;
+            transition: opacity 0.2s;
+            margin-bottom: 8px;
+        `;
+        // Use textContent to prevent XSS
+        tooltip.textContent = this.sanitizeText(annotation.text);
+        element.appendChild(tooltip);
+
+        // Show tooltip on hover
+        element.addEventListener('mouseenter', () => {
+            tooltip.style.opacity = '1';
+        });
+        
+        element.addEventListener('mouseleave', () => {
+            tooltip.style.opacity = '0';
+        });
+
+        // Handle click for editing
+        element.addEventListener('click', (e) => {
+            e.stopPropagation();
+            this.selectAnnotation(annotation);
+        });
+
+        container.appendChild(element);
+        return element;
+    }
+
+    /**
+     * Setup annotation creation on click
+     */
+    private setupAnnotationCreation(overlay: HTMLElement, noteId: string): void {
+        overlay.addEventListener('click', async (e) => {
+            if (!this.isEditMode) return;
+            
+            const rect = overlay.getBoundingClientRect();
+            const x = ((e.clientX - rect.left) / rect.width) * 100;
+            const y = ((e.clientY - rect.top) / rect.height) * 100;
+            
+            // Show annotation creation dialog
+            const text = prompt('Enter annotation text:');
+            if (text) {
+                await this.saveAnnotation({
+                    noteId,
+                    x,
+                    y,
+                    text,
+                    author: 'current_user', // TODO: Get from session
+                    type: 'comment'
+                });
+                
+                // Reload annotations
+                await this.loadAnnotations(noteId);
+                
+                // Re-render
+                const imageElement = overlay.parentElement?.querySelector('img') as HTMLImageElement;
+                if (imageElement && overlay.parentElement) {
+                    this.renderAnnotations(overlay.parentElement, noteId, imageElement);
+                }
+            }
+        });
+    }
+
+    /**
+     * Select an annotation for editing
+     */
+    private selectAnnotation(annotation: ImageAnnotation): void {
+        this.selectedAnnotation = annotation;
+        
+        // Highlight selected annotation
+        this.annotationElements.forEach((element, id) => {
+            if (id === annotation.id) {
+                element.classList.add('selected');
+                element.style.outline = '2px solid #2196F3';
+            } else {
+                element.classList.remove('selected');
+                element.style.outline = 'none';
+            }
+        });
+        
+        // Show edit options
+        if (this.isEditMode) {
+            this.showEditDialog(annotation);
+        }
+    }
+
+    /**
+     * Show edit dialog for annotation
+     */
+    private showEditDialog(annotation: ImageAnnotation): void {
+        // Simple implementation - could be replaced with a proper modal
+        const newText = prompt('Edit annotation:', annotation.text);
+        if (newText !== null) {
+            annotation.text = newText;
+            this.updateAnnotation(annotation);
+            
+            // Update tooltip with sanitized text
+            const element = this.annotationElements.get(annotation.id);
+            if (element) {
+                const tooltip = element.querySelector('.annotation-tooltip');
+                if (tooltip) {
+                    // Use textContent to prevent XSS
+                    tooltip.textContent = this.sanitizeText(newText);
+                }
+            }
+        }
+    }
+
+    /**
+     * Toggle edit mode
+     */
+    toggleEditMode(): void {
+        this.isEditMode = !this.isEditMode;
+        
+        // Update overlay pointer events
+        document.querySelectorAll('.annotation-overlay').forEach(overlay => {
+            (overlay as HTMLElement).style.pointerEvents = this.isEditMode ? 'auto' : 'none';
+        });
+    }
+
+    /**
+     * Clear all annotation elements
+     */
+    private clearAnnotationElements(): void {
+        this.annotationElements.forEach(element => element.remove());
+        this.annotationElements.clear();
+    }
+
+    /**
+     * Generate unique ID
+     */
+    private generateId(): string {
+        return `ann_${Date.now()}_${Math.random().toString(36).substr(2, 9)}`;
+    }
+
+    /**
+     * Export annotations as JSON
+     */
+    exportAnnotations(noteId: string): string {
+        const annotations = this.activeAnnotations.get(noteId) || [];
+        return JSON.stringify(annotations, null, 2);
+    }
+
+    /**
+     * Import annotations from JSON
+     */
+    async importAnnotations(noteId: string, json: string): Promise<void> {
+        try {
+            const annotations = JSON.parse(json) as ImageAnnotation[];
+            
+            for (const annotation of annotations) {
+                await this.saveAnnotation({
+                    noteId,
+                    x: annotation.x,
+                    y: annotation.y,
+                    text: annotation.text,
+                    author: annotation.author,
+                    color: annotation.color,
+                    icon: annotation.icon,
+                    type: annotation.type,
+                    width: annotation.width,
+                    height: annotation.height
+                });
+            }
+            
+            await this.loadAnnotations(noteId);
+        } catch (error) {
+            console.error('Failed to import annotations:', error);
+            throw error;
+        }
+    }
+
+    /**
+     * Sanitize text to prevent XSS
+     */
+    private sanitizeText(text: string): string {
+        if (!text) return '';
+        
+        // Remove any HTML tags and dangerous characters
+        const div = document.createElement('div');
+        div.textContent = text;
+        
+        // Additional validation
+        const sanitized = div.textContent || '';
+        
+        // Remove any remaining special characters that could be dangerous
+        return sanitized
+            .replace(/<script[^>]*>.*?<\/script>/gi, '')
+            .replace(/<iframe[^>]*>.*?<\/iframe>/gi, '')
+            .replace(/javascript:/gi, '')
+            .replace(/on\w+\s*=/gi, '');
+    }
+    
+    /**
+     * Cleanup resources
+     */
+    cleanup(): void {
+        this.clearAnnotationElements();
+        this.activeAnnotations.clear();
+        this.selectedAnnotation = null;
+        this.isEditMode = false;
+    }
+}
+
+export default ImageAnnotationsService.getInstance();

apps/client/src/services/image_comparison.ts

@@ -0,0 +1,877 @@
+/**
+ * Image Comparison Module for Trilium Notes
+ * Provides side-by-side and overlay comparison modes for images
+ */
+
+import mediaViewer from './media_viewer.js';
+import utils from './utils.js';
+
+/**
+ * Comparison mode types
+ */
+export type ComparisonMode = 'side-by-side' | 'overlay' | 'swipe' | 'difference';
+
+/**
+ * Image comparison configuration
+ */
+export interface ComparisonConfig {
+    mode: ComparisonMode;
+    syncZoom: boolean;
+    syncPan: boolean;
+    showLabels: boolean;
+    swipePosition?: number; // For swipe mode (0-100)
+    opacity?: number; // For overlay mode (0-1)
+    highlightDifferences?: boolean; // For difference mode
+}
+
+/**
+ * Comparison state
+ */
+interface ComparisonState {
+    leftImage: ComparisonImage;
+    rightImage: ComparisonImage;
+    config: ComparisonConfig;
+    container?: HTMLElement;
+    isActive: boolean;
+}
+
+/**
+ * Image data for comparison
+ */
+export interface ComparisonImage {
+    src: string;
+    title?: string;
+    noteId?: string;
+    width?: number;
+    height?: number;
+}
+
+/**
+ * ImageComparisonService provides various comparison modes for images
+ */
+class ImageComparisonService {
+    private static instance: ImageComparisonService;
+    private currentComparison: ComparisonState | null = null;
+    private comparisonContainer?: HTMLElement;
+    private leftCanvas?: HTMLCanvasElement;
+    private rightCanvas?: HTMLCanvasElement;
+    private leftContext?: CanvasRenderingContext2D;
+    private rightContext?: CanvasRenderingContext2D;
+    private swipeHandle?: HTMLElement;
+    private isDraggingSwipe: boolean = false;
+    private currentZoom: number = 1;
+    private panX: number = 0;
+    private panY: number = 0;
+    
+    private defaultConfig: ComparisonConfig = {
+        mode: 'side-by-side',
+        syncZoom: true,
+        syncPan: true,
+        showLabels: true,
+        swipePosition: 50,
+        opacity: 0.5,
+        highlightDifferences: false
+    };
+
+    private constructor() {}
+
+    static getInstance(): ImageComparisonService {
+        if (!ImageComparisonService.instance) {
+            ImageComparisonService.instance = new ImageComparisonService();
+        }
+        return ImageComparisonService.instance;
+    }
+
+    /**
+     * Start image comparison
+     */
+    async startComparison(
+        leftImage: ComparisonImage,
+        rightImage: ComparisonImage,
+        container: HTMLElement,
+        config?: Partial<ComparisonConfig>
+    ): Promise<void> {
+        try {
+            // Close any existing comparison
+            this.closeComparison();
+
+            // Merge configuration
+            const finalConfig = { ...this.defaultConfig, ...config };
+
+            // Initialize state
+            this.currentComparison = {
+                leftImage,
+                rightImage,
+                config: finalConfig,
+                container,
+                isActive: true
+            };
+
+            // Load images
+            await this.loadImages(leftImage, rightImage);
+
+            // Create comparison UI based on mode
+            switch (finalConfig.mode) {
+                case 'side-by-side':
+                    await this.createSideBySideComparison(container);
+                    break;
+                case 'overlay':
+                    await this.createOverlayComparison(container);
+                    break;
+                case 'swipe':
+                    await this.createSwipeComparison(container);
+                    break;
+                case 'difference':
+                    await this.createDifferenceComparison(container);
+                    break;
+            }
+
+            // Add controls
+            this.addComparisonControls(container);
+        } catch (error) {
+            console.error('Failed to start image comparison:', error);
+            this.closeComparison();
+            throw error;
+        }
+    }
+
+    /**
+     * Load images and get dimensions
+     */
+    private async loadImages(leftImage: ComparisonImage, rightImage: ComparisonImage): Promise<void> {
+        const loadImage = (src: string): Promise<HTMLImageElement> => {
+            return new Promise((resolve, reject) => {
+                const img = new Image();
+                img.onload = () => resolve(img);
+                img.onerror = () => reject(new Error(`Failed to load image: ${src}`));
+                img.src = src;
+            });
+        };
+
+        const [leftImg, rightImg] = await Promise.all([
+            loadImage(leftImage.src),
+            loadImage(rightImage.src)
+        ]);
+
+        // Update dimensions
+        leftImage.width = leftImg.naturalWidth;
+        leftImage.height = leftImg.naturalHeight;
+        rightImage.width = rightImg.naturalWidth;
+        rightImage.height = rightImg.naturalHeight;
+    }
+
+    /**
+     * Create side-by-side comparison
+     */
+    private async createSideBySideComparison(container: HTMLElement): Promise<void> {
+        if (!this.currentComparison) return;
+
+        // Clear container
+        container.innerHTML = '';
+        container.style.cssText = `
+            display: flex;
+            width: 100%;
+            height: 100%;
+            position: relative;
+            background: #1a1a1a;
+        `;
+
+        // Create left panel
+        const leftPanel = document.createElement('div');
+        leftPanel.className = 'comparison-panel comparison-left';
+        leftPanel.style.cssText = `
+            flex: 1;
+            position: relative;
+            overflow: hidden;
+            border-right: 2px solid #333;
+        `;
+
+        // Create right panel
+        const rightPanel = document.createElement('div');
+        rightPanel.className = 'comparison-panel comparison-right';
+        rightPanel.style.cssText = `
+            flex: 1;
+            position: relative;
+            overflow: hidden;
+        `;
+
+        // Add images
+        const leftImg = await this.createImageElement(this.currentComparison.leftImage);
+        const rightImg = await this.createImageElement(this.currentComparison.rightImage);
+        
+        leftPanel.appendChild(leftImg);
+        rightPanel.appendChild(rightImg);
+
+        // Add labels if enabled
+        if (this.currentComparison.config.showLabels) {
+            this.addImageLabel(leftPanel, this.currentComparison.leftImage.title || 'Image 1');
+            this.addImageLabel(rightPanel, this.currentComparison.rightImage.title || 'Image 2');
+        }
+
+        container.appendChild(leftPanel);
+        container.appendChild(rightPanel);
+
+        // Setup synchronized zoom and pan if enabled
+        if (this.currentComparison.config.syncZoom || this.currentComparison.config.syncPan) {
+            this.setupSynchronizedControls(leftPanel, rightPanel);
+        }
+    }
+
+    /**
+     * Create overlay comparison
+     */
+    private async createOverlayComparison(container: HTMLElement): Promise<void> {
+        if (!this.currentComparison) return;
+
+        container.innerHTML = '';
+        container.style.cssText = `
+            position: relative;
+            width: 100%;
+            height: 100%;
+            background: #1a1a1a;
+            overflow: hidden;
+        `;
+
+        // Create base image
+        const baseImg = await this.createImageElement(this.currentComparison.leftImage);
+        baseImg.style.position = 'absolute';
+        baseImg.style.zIndex = '1';
+        
+        // Create overlay image
+        const overlayImg = await this.createImageElement(this.currentComparison.rightImage);
+        overlayImg.style.position = 'absolute';
+        overlayImg.style.zIndex = '2';
+        overlayImg.style.opacity = String(this.currentComparison.config.opacity || 0.5);
+        
+        container.appendChild(baseImg);
+        container.appendChild(overlayImg);
+
+        // Add opacity slider
+        this.addOpacityControl(container, overlayImg);
+
+        // Add labels
+        if (this.currentComparison.config.showLabels) {
+            const labelContainer = document.createElement('div');
+            labelContainer.style.cssText = `
+                position: absolute;
+                top: 10px;
+                left: 10px;
+                z-index: 10;
+                display: flex;
+                gap: 10px;
+            `;
+            
+            const baseLabel = this.createLabel(this.currentComparison.leftImage.title || 'Base', '#4CAF50');
+            const overlayLabel = this.createLabel(this.currentComparison.rightImage.title || 'Overlay', '#2196F3');
+            
+            labelContainer.appendChild(baseLabel);
+            labelContainer.appendChild(overlayLabel);
+            container.appendChild(labelContainer);
+        }
+    }
+
+    /**
+     * Create swipe comparison
+     */
+    private async createSwipeComparison(container: HTMLElement): Promise<void> {
+        if (!this.currentComparison) return;
+
+        container.innerHTML = '';
+        container.style.cssText = `
+            position: relative;
+            width: 100%;
+            height: 100%;
+            background: #1a1a1a;
+            overflow: hidden;
+            cursor: ew-resize;
+        `;
+
+        // Create images
+        const leftImg = await this.createImageElement(this.currentComparison.leftImage);
+        const rightImg = await this.createImageElement(this.currentComparison.rightImage);
+        
+        leftImg.style.position = 'absolute';
+        leftImg.style.zIndex = '1';
+        
+        // Create clipping container for right image
+        const clipContainer = document.createElement('div');
+        clipContainer.className = 'swipe-clip-container';
+        clipContainer.style.cssText = `
+            position: absolute;
+            top: 0;
+            left: 0;
+            width: ${this.currentComparison.config.swipePosition}%;
+            height: 100%;
+            overflow: hidden;
+            z-index: 2;
+        `;
+        
+        rightImg.style.position = 'absolute';
+        clipContainer.appendChild(rightImg);
+        
+        // Create swipe handle
+        this.swipeHandle = document.createElement('div');
+        this.swipeHandle.className = 'swipe-handle';
+        this.swipeHandle.style.cssText = `
+            position: absolute;
+            top: 0;
+            left: ${this.currentComparison.config.swipePosition}%;
+            width: 4px;
+            height: 100%;
+            background: white;
+            cursor: ew-resize;
+            z-index: 3;
+            transform: translateX(-50%);
+            box-shadow: 0 0 10px rgba(0,0,0,0.5);
+        `;
+
+        // Add handle icon
+        const handleIcon = document.createElement('div');
+        handleIcon.style.cssText = `
+            position: absolute;
+            top: 50%;
+            left: 50%;
+            transform: translate(-50%, -50%);
+            width: 40px;
+            height: 40px;
+            background: white;
+            border-radius: 50%;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            box-shadow: 0 2px 10px rgba(0,0,0,0.3);
+        `;
+        handleIcon.innerHTML = '<i class="bx bx-move-horizontal" style="font-size: 24px; color: #333;"></i>';
+        this.swipeHandle.appendChild(handleIcon);
+
+        container.appendChild(leftImg);
+        container.appendChild(clipContainer);
+        container.appendChild(this.swipeHandle);
+
+        // Setup swipe interaction
+        this.setupSwipeInteraction(container, clipContainer);
+
+        // Add labels
+        if (this.currentComparison.config.showLabels) {
+            this.addSwipeLabels(container);
+        }
+    }
+
+    /**
+     * Create difference comparison using canvas
+     */
+    private async createDifferenceComparison(container: HTMLElement): Promise<void> {
+        if (!this.currentComparison) return;
+
+        container.innerHTML = '';
+        container.style.cssText = `
+            position: relative;
+            width: 100%;
+            height: 100%;
+            background: #1a1a1a;
+            overflow: hidden;
+        `;
+
+        // Create canvas for difference visualization
+        const canvas = document.createElement('canvas');
+        canvas.className = 'difference-canvas';
+        const ctx = canvas.getContext('2d');
+        
+        if (!ctx) {
+            throw new Error('Failed to get canvas context');
+        }
+
+        // Load images
+        const leftImg = new Image();
+        const rightImg = new Image();
+        
+        await Promise.all([
+            new Promise((resolve) => {
+                leftImg.onload = resolve;
+                leftImg.src = this.currentComparison!.leftImage.src;
+            }),
+            new Promise((resolve) => {
+                rightImg.onload = resolve;
+                rightImg.src = this.currentComparison!.rightImage.src;
+            })
+        ]);
+
+        // Set canvas size
+        const maxWidth = Math.max(leftImg.width, rightImg.width);
+        const maxHeight = Math.max(leftImg.height, rightImg.height);
+        canvas.width = maxWidth;
+        canvas.height = maxHeight;
+
+        // Calculate difference
+        this.calculateImageDifference(ctx, leftImg, rightImg, maxWidth, maxHeight);
+
+        // Style canvas
+        canvas.style.cssText = `
+            max-width: 100%;
+            max-height: 100%;
+            object-fit: contain;
+        `;
+
+        container.appendChild(canvas);
+
+        // Add difference statistics
+        this.addDifferenceStatistics(container, ctx, maxWidth, maxHeight);
+    }
+
+    /**
+     * Calculate and visualize image difference
+     */
+    private calculateImageDifference(
+        ctx: CanvasRenderingContext2D,
+        leftImg: HTMLImageElement,
+        rightImg: HTMLImageElement,
+        width: number,
+        height: number
+    ): void {
+        // Draw left image
+        ctx.drawImage(leftImg, 0, 0, width, height);
+        const leftData = ctx.getImageData(0, 0, width, height);
+
+        // Draw right image
+        ctx.clearRect(0, 0, width, height);
+        ctx.drawImage(rightImg, 0, 0, width, height);
+        const rightData = ctx.getImageData(0, 0, width, height);
+
+        // Calculate difference
+        const diffData = ctx.createImageData(width, height);
+        let totalDiff = 0;
+
+        for (let i = 0; i < leftData.data.length; i += 4) {
+            const rDiff = Math.abs(leftData.data[i] - rightData.data[i]);
+            const gDiff = Math.abs(leftData.data[i + 1] - rightData.data[i + 1]);
+            const bDiff = Math.abs(leftData.data[i + 2] - rightData.data[i + 2]);
+            
+            const avgDiff = (rDiff + gDiff + bDiff) / 3;
+            totalDiff += avgDiff;
+
+            if (this.currentComparison?.config.highlightDifferences && avgDiff > 30) {
+                // Highlight differences in red
+                diffData.data[i] = 255; // Red
+                diffData.data[i + 1] = 0; // Green
+                diffData.data[i + 2] = 0; // Blue
+                diffData.data[i + 3] = Math.min(255, avgDiff * 2); // Alpha based on difference
+            } else {
+                // Show original image with reduced opacity for non-different areas
+                diffData.data[i] = leftData.data[i];
+                diffData.data[i + 1] = leftData.data[i + 1];
+                diffData.data[i + 2] = leftData.data[i + 2];
+                diffData.data[i + 3] = avgDiff > 10 ? 255 : 128;
+            }
+        }
+
+        ctx.putImageData(diffData, 0, 0);
+    }
+
+    /**
+     * Add difference statistics overlay
+     */
+    private addDifferenceStatistics(
+        container: HTMLElement,
+        ctx: CanvasRenderingContext2D,
+        width: number,
+        height: number
+    ): void {
+        const imageData = ctx.getImageData(0, 0, width, height);
+        let changedPixels = 0;
+        const threshold = 30;
+
+        for (let i = 0; i < imageData.data.length; i += 4) {
+            const r = imageData.data[i];
+            const g = imageData.data[i + 1];
+            const b = imageData.data[i + 2];
+            
+            if (r > threshold || g > threshold || b > threshold) {
+                changedPixels++;
+            }
+        }
+
+        const totalPixels = width * height;
+        const changePercentage = ((changedPixels / totalPixels) * 100).toFixed(2);
+
+        const statsDiv = document.createElement('div');
+        statsDiv.className = 'difference-stats';
+        statsDiv.style.cssText = `
+            position: absolute;
+            top: 10px;
+            right: 10px;
+            background: rgba(0, 0, 0, 0.8);
+            color: white;
+            padding: 10px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+        `;
+        
+        statsDiv.innerHTML = `
+            <div><strong>Difference Analysis</strong></div>
+            <div>Changed pixels: ${changedPixels.toLocaleString()}</div>
+            <div>Total pixels: ${totalPixels.toLocaleString()}</div>
+            <div>Difference: ${changePercentage}%</div>
+        `;
+        
+        container.appendChild(statsDiv);
+    }
+
+    /**
+     * Create image element
+     */
+    private async createImageElement(image: ComparisonImage): Promise<HTMLImageElement> {
+        const img = document.createElement('img');
+        img.src = image.src;
+        img.alt = image.title || 'Comparison image';
+        img.style.cssText = `
+            width: 100%;
+            height: 100%;
+            object-fit: contain;
+        `;
+        
+        await new Promise((resolve, reject) => {
+            img.onload = resolve;
+            img.onerror = reject;
+        });
+        
+        return img;
+    }
+
+    /**
+     * Add image label
+     */
+    private addImageLabel(container: HTMLElement, text: string): void {
+        const label = document.createElement('div');
+        label.className = 'image-label';
+        label.style.cssText = `
+            position: absolute;
+            top: 10px;
+            left: 10px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 6px 10px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+        `;
+        label.textContent = text;
+        container.appendChild(label);
+    }
+
+    /**
+     * Create label element
+     */
+    private createLabel(text: string, color: string): HTMLElement {
+        const label = document.createElement('div');
+        label.style.cssText = `
+            background: ${color};
+            color: white;
+            padding: 4px 8px;
+            border-radius: 3px;
+            font-size: 12px;
+        `;
+        label.textContent = text;
+        return label;
+    }
+
+    /**
+     * Add swipe labels
+     */
+    private addSwipeLabels(container: HTMLElement): void {
+        if (!this.currentComparison) return;
+
+        const leftLabel = document.createElement('div');
+        leftLabel.style.cssText = `
+            position: absolute;
+            top: 10px;
+            left: 10px;
+            background: rgba(76, 175, 80, 0.9);
+            color: white;
+            padding: 6px 10px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+        `;
+        leftLabel.textContent = this.currentComparison.leftImage.title || 'Left';
+
+        const rightLabel = document.createElement('div');
+        rightLabel.style.cssText = `
+            position: absolute;
+            top: 10px;
+            right: 10px;
+            background: rgba(33, 150, 243, 0.9);
+            color: white;
+            padding: 6px 10px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+        `;
+        rightLabel.textContent = this.currentComparison.rightImage.title || 'Right';
+
+        container.appendChild(leftLabel);
+        container.appendChild(rightLabel);
+    }
+
+    /**
+     * Setup swipe interaction
+     */
+    private setupSwipeInteraction(container: HTMLElement, clipContainer: HTMLElement): void {
+        if (!this.swipeHandle) return;
+
+        let startX = 0;
+        let startPosition = this.currentComparison?.config.swipePosition || 50;
+
+        const handleMouseMove = (e: MouseEvent) => {
+            if (!this.isDraggingSwipe) return;
+            
+            const rect = container.getBoundingClientRect();
+            const x = e.clientX - rect.left;
+            const percentage = Math.max(0, Math.min(100, (x / rect.width) * 100));
+            
+            clipContainer.style.width = `${percentage}%`;
+            if (this.swipeHandle) {
+                this.swipeHandle.style.left = `${percentage}%`;
+            }
+            
+            if (this.currentComparison) {
+                this.currentComparison.config.swipePosition = percentage;
+            }
+        };
+
+        const handleMouseUp = () => {
+            this.isDraggingSwipe = false;
+            document.removeEventListener('mousemove', handleMouseMove);
+            document.removeEventListener('mouseup', handleMouseUp);
+            container.style.cursor = 'default';
+        };
+
+        this.swipeHandle.addEventListener('mousedown', (e) => {
+            this.isDraggingSwipe = true;
+            startX = e.clientX;
+            startPosition = this.currentComparison?.config.swipePosition || 50;
+            container.style.cursor = 'ew-resize';
+            
+            document.addEventListener('mousemove', handleMouseMove);
+            document.addEventListener('mouseup', handleMouseUp);
+        });
+
+        // Also allow dragging anywhere in the container
+        container.addEventListener('mousedown', (e) => {
+            if (e.target === this.swipeHandle || (e.target as HTMLElement).parentElement === this.swipeHandle) {
+                return;
+            }
+            
+            const rect = container.getBoundingClientRect();
+            const x = e.clientX - rect.left;
+            const percentage = (x / rect.width) * 100;
+            
+            clipContainer.style.width = `${percentage}%`;
+            if (this.swipeHandle) {
+                this.swipeHandle.style.left = `${percentage}%`;
+            }
+            
+            if (this.currentComparison) {
+                this.currentComparison.config.swipePosition = percentage;
+            }
+        });
+    }
+
+    /**
+     * Add opacity control for overlay mode
+     */
+    private addOpacityControl(container: HTMLElement, overlayImg: HTMLImageElement): void {
+        const control = document.createElement('div');
+        control.className = 'opacity-control';
+        control.style.cssText = `
+            position: absolute;
+            bottom: 20px;
+            left: 50%;
+            transform: translateX(-50%);
+            background: rgba(0, 0, 0, 0.8);
+            padding: 10px 20px;
+            border-radius: 4px;
+            z-index: 10;
+            display: flex;
+            align-items: center;
+            gap: 10px;
+        `;
+
+        const label = document.createElement('label');
+        label.textContent = 'Opacity:';
+        label.style.color = 'white';
+        label.style.fontSize = '12px';
+
+        const slider = document.createElement('input');
+        slider.type = 'range';
+        slider.min = '0';
+        slider.max = '100';
+        slider.value = String((this.currentComparison?.config.opacity || 0.5) * 100);
+        slider.style.width = '150px';
+
+        const value = document.createElement('span');
+        value.textContent = `${slider.value}%`;
+        value.style.color = 'white';
+        value.style.fontSize = '12px';
+        value.style.minWidth = '35px';
+
+        slider.addEventListener('input', () => {
+            const opacity = parseInt(slider.value) / 100;
+            overlayImg.style.opacity = String(opacity);
+            value.textContent = `${slider.value}%`;
+            
+            if (this.currentComparison) {
+                this.currentComparison.config.opacity = opacity;
+            }
+        });
+
+        control.appendChild(label);
+        control.appendChild(slider);
+        control.appendChild(value);
+        container.appendChild(control);
+    }
+
+    /**
+     * Setup synchronized controls for side-by-side mode
+     */
+    private setupSynchronizedControls(leftPanel: HTMLElement, rightPanel: HTMLElement): void {
+        const leftImg = leftPanel.querySelector('img') as HTMLImageElement;
+        const rightImg = rightPanel.querySelector('img') as HTMLImageElement;
+        
+        if (!leftImg || !rightImg) return;
+
+        // Synchronize scroll
+        if (this.currentComparison?.config.syncPan) {
+            leftPanel.addEventListener('scroll', () => {
+                rightPanel.scrollLeft = leftPanel.scrollLeft;
+                rightPanel.scrollTop = leftPanel.scrollTop;
+            });
+            
+            rightPanel.addEventListener('scroll', () => {
+                leftPanel.scrollLeft = rightPanel.scrollLeft;
+                leftPanel.scrollTop = rightPanel.scrollTop;
+            });
+        }
+
+        // Synchronize zoom with wheel events
+        if (this.currentComparison?.config.syncZoom) {
+            const handleWheel = (e: WheelEvent) => {
+                e.preventDefault();
+                
+                const delta = e.deltaY < 0 ? 1.1 : 0.9;
+                this.currentZoom = Math.max(0.5, Math.min(5, this.currentZoom * delta));
+                
+                leftImg.style.transform = `scale(${this.currentZoom})`;
+                rightImg.style.transform = `scale(${this.currentZoom})`;
+            };
+            
+            leftPanel.addEventListener('wheel', handleWheel);
+            rightPanel.addEventListener('wheel', handleWheel);
+        }
+    }
+
+    /**
+     * Add comparison controls toolbar
+     */
+    private addComparisonControls(container: HTMLElement): void {
+        const toolbar = document.createElement('div');
+        toolbar.className = 'comparison-toolbar';
+        toolbar.style.cssText = `
+            position: absolute;
+            top: 10px;
+            right: 10px;
+            background: rgba(0, 0, 0, 0.8);
+            border-radius: 4px;
+            padding: 8px;
+            display: flex;
+            gap: 8px;
+            z-index: 100;
+        `;
+
+        // Mode switcher
+        const modes: ComparisonMode[] = ['side-by-side', 'overlay', 'swipe', 'difference'];
+        modes.forEach(mode => {
+            const btn = document.createElement('button');
+            btn.className = `mode-btn mode-${mode}`;
+            btn.style.cssText = `
+                background: ${this.currentComparison?.config.mode === mode ? '#2196F3' : 'rgba(255,255,255,0.1)'};
+                color: white;
+                border: none;
+                padding: 6px 10px;
+                border-radius: 3px;
+                cursor: pointer;
+                font-size: 12px;
+            `;
+            btn.textContent = mode.replace('-', ' ').replace(/\b\w/g, l => l.toUpperCase());
+            
+            btn.addEventListener('click', async () => {
+                if (this.currentComparison && this.currentComparison.container) {
+                    this.currentComparison.config.mode = mode;
+                    await this.startComparison(
+                        this.currentComparison.leftImage,
+                        this.currentComparison.rightImage,
+                        this.currentComparison.container,
+                        this.currentComparison.config
+                    );
+                }
+            });
+            
+            toolbar.appendChild(btn);
+        });
+
+        // Close button
+        const closeBtn = document.createElement('button');
+        closeBtn.style.cssText = `
+            background: rgba(255,0,0,0.5);
+            color: white;
+            border: none;
+            padding: 6px 10px;
+            border-radius: 3px;
+            cursor: pointer;
+            font-size: 12px;
+            margin-left: 10px;
+        `;
+        closeBtn.textContent = 'Close';
+        closeBtn.addEventListener('click', () => this.closeComparison());
+        
+        toolbar.appendChild(closeBtn);
+        container.appendChild(toolbar);
+    }
+
+    /**
+     * Close comparison
+     */
+    closeComparison(): void {
+        if (this.currentComparison?.container) {
+            this.currentComparison.container.innerHTML = '';
+        }
+        
+        this.currentComparison = null;
+        this.comparisonContainer = undefined;
+        this.leftCanvas = undefined;
+        this.rightCanvas = undefined;
+        this.leftContext = undefined;
+        this.rightContext = undefined;
+        this.swipeHandle = undefined;
+        this.isDraggingSwipe = false;
+        this.currentZoom = 1;
+        this.panX = 0;
+        this.panY = 0;
+    }
+
+    /**
+     * Check if comparison is active
+     */
+    isComparisonActive(): boolean {
+        return this.currentComparison?.isActive || false;
+    }
+
+    /**
+     * Get current comparison state
+     */
+    getComparisonState(): ComparisonState | null {
+        return this.currentComparison;
+    }
+}
+
+export default ImageComparisonService.getInstance();

apps/client/src/services/image_editor.ts

@@ -0,0 +1,874 @@
+/**
+ * Basic Image Editor Module for Trilium Notes
+ * Provides non-destructive image editing capabilities
+ */
+
+import server from './server.js';
+import toastService from './toast.js';
+import { ImageValidator, withErrorBoundary, MemoryMonitor, ImageError, ImageErrorType } from './image_error_handler.js';
+
+/**
+ * Edit operation types
+ */
+export type EditOperation = 
+    | 'rotate'
+    | 'crop'
+    | 'brightness'
+    | 'contrast'
+    | 'saturation'
+    | 'blur'
+    | 'sharpen';
+
+/**
+ * Edit history entry
+ */
+export interface EditHistoryEntry {
+    operation: EditOperation;
+    params: any;
+    timestamp: Date;
+}
+
+/**
+ * Crop area definition
+ */
+export interface CropArea {
+    x: number;
+    y: number;
+    width: number;
+    height: number;
+}
+
+/**
+ * Editor state
+ */
+interface EditorState {
+    originalImage: HTMLImageElement | null;
+    currentImage: HTMLImageElement | null;
+    canvas: HTMLCanvasElement;
+    context: CanvasRenderingContext2D;
+    history: EditHistoryEntry[];
+    historyIndex: number;
+    isEditing: boolean;
+}
+
+/**
+ * Filter parameters
+ */
+export interface FilterParams {
+    brightness?: number; // -100 to 100
+    contrast?: number; // -100 to 100
+    saturation?: number; // -100 to 100
+    blur?: number; // 0 to 20
+    sharpen?: number; // 0 to 100
+}
+
+/**
+ * ImageEditorService provides basic image editing capabilities
+ */
+class ImageEditorService {
+    private static instance: ImageEditorService;
+    private editorState: EditorState;
+    private tempCanvas: HTMLCanvasElement;
+    private tempContext: CanvasRenderingContext2D;
+    private cropOverlay?: HTMLElement;
+    private cropHandles?: HTMLElement[];
+    private cropArea: CropArea | null = null;
+    private isDraggingCrop: boolean = false;
+    private dragStartX: number = 0;
+    private dragStartY: number = 0;
+    private currentFilters: FilterParams = {};
+    
+    // Canvas size limits for security and memory management
+    private readonly MAX_CANVAS_SIZE = 8192; // Maximum width/height
+    private readonly MAX_CANVAS_AREA = 50000000; // 50 megapixels
+
+    private constructor() {
+        // Initialize canvases
+        this.editorState = {
+            originalImage: null,
+            currentImage: null,
+            canvas: document.createElement('canvas'),
+            context: null as any,
+            history: [],
+            historyIndex: -1,
+            isEditing: false
+        };
+        
+        const ctx = this.editorState.canvas.getContext('2d');
+        if (!ctx) {
+            throw new Error('Failed to get canvas context');
+        }
+        this.editorState.context = ctx;
+        
+        this.tempCanvas = document.createElement('canvas');
+        const tempCtx = this.tempCanvas.getContext('2d');
+        if (!tempCtx) {
+            throw new Error('Failed to get temp canvas context');
+        }
+        this.tempContext = tempCtx;
+    }
+
+    static getInstance(): ImageEditorService {
+        if (!ImageEditorService.instance) {
+            ImageEditorService.instance = new ImageEditorService();
+        }
+        return ImageEditorService.instance;
+    }
+
+    /**
+     * Start editing an image
+     */
+    async startEditing(src: string | HTMLImageElement): Promise<HTMLCanvasElement> {
+        return await withErrorBoundary(async () => {
+            // Validate input
+            if (typeof src === 'string') {
+                ImageValidator.validateUrl(src);
+            }
+            // Load image
+            let img: HTMLImageElement;
+            if (typeof src === 'string') {
+                img = await this.loadImage(src);
+            } else {
+                img = src;
+            }
+            
+            // Validate image dimensions
+            ImageValidator.validateDimensions(img.naturalWidth, img.naturalHeight);
+            
+            // Check memory availability
+            const estimatedMemory = MemoryMonitor.estimateImageMemory(img.naturalWidth, img.naturalHeight);
+            if (!MemoryMonitor.checkMemoryAvailable(estimatedMemory)) {
+                throw new ImageError(
+                    ImageErrorType.MEMORY_ERROR,
+                    'Insufficient memory to process image',
+                    { estimatedMemory }
+                );
+            }
+            
+            if (img.naturalWidth > this.MAX_CANVAS_SIZE || 
+                img.naturalHeight > this.MAX_CANVAS_SIZE ||
+                img.naturalWidth * img.naturalHeight > this.MAX_CANVAS_AREA) {
+                
+                // Scale down if too large
+                const scale = Math.min(
+                    this.MAX_CANVAS_SIZE / Math.max(img.naturalWidth, img.naturalHeight),
+                    Math.sqrt(this.MAX_CANVAS_AREA / (img.naturalWidth * img.naturalHeight))
+                );
+                
+                const scaledWidth = Math.floor(img.naturalWidth * scale);
+                const scaledHeight = Math.floor(img.naturalHeight * scale);
+                
+                console.warn(`Image too large (${img.naturalWidth}x${img.naturalHeight}), scaling to ${scaledWidth}x${scaledHeight}`);
+                
+                // Create scaled image
+                const scaledCanvas = document.createElement('canvas');
+                scaledCanvas.width = scaledWidth;
+                scaledCanvas.height = scaledHeight;
+                const scaledCtx = scaledCanvas.getContext('2d');
+                if (!scaledCtx) throw new Error('Failed to get scaled canvas context');
+                
+                scaledCtx.drawImage(img, 0, 0, scaledWidth, scaledHeight);
+                
+                // Create new image from scaled canvas
+                const scaledImg = new Image();
+                scaledImg.src = scaledCanvas.toDataURL();
+                await new Promise(resolve => scaledImg.onload = resolve);
+                img = scaledImg;
+                
+                // Clean up scaled canvas
+                scaledCanvas.width = 0;
+                scaledCanvas.height = 0;
+            }
+            
+            // Store original
+            this.editorState.originalImage = img;
+            this.editorState.currentImage = img;
+            this.editorState.isEditing = true;
+            this.editorState.history = [];
+            this.editorState.historyIndex = -1;
+            this.currentFilters = {};
+            
+            // Setup canvas with validated dimensions
+            this.editorState.canvas.width = img.naturalWidth;
+            this.editorState.canvas.height = img.naturalHeight;
+            this.editorState.context.drawImage(img, 0, 0);
+            
+            return this.editorState.canvas;
+        }, (error) => {
+            this.stopEditing();
+            throw error;
+        }) || this.editorState.canvas;
+    }
+
+    /**
+     * Rotate image by degrees (90, 180, 270)
+     */
+    rotate(degrees: 90 | 180 | 270 | -90): void {
+        if (!this.editorState.isEditing) return;
+        
+        const { canvas, context } = this.editorState;
+        const { width, height } = canvas;
+        
+        // Setup temp canvas
+        if (degrees === 90 || degrees === -90 || degrees === 270) {
+            this.tempCanvas.width = height;
+            this.tempCanvas.height = width;
+        } else {
+            this.tempCanvas.width = width;
+            this.tempCanvas.height = height;
+        }
+        
+        // Clear temp canvas
+        this.tempContext.clearRect(0, 0, this.tempCanvas.width, this.tempCanvas.height);
+        
+        // Rotate
+        this.tempContext.save();
+        
+        if (degrees === 90) {
+            this.tempContext.translate(height, 0);
+            this.tempContext.rotate(Math.PI / 2);
+        } else if (degrees === 180) {
+            this.tempContext.translate(width, height);
+            this.tempContext.rotate(Math.PI);
+        } else if (degrees === 270 || degrees === -90) {
+            this.tempContext.translate(0, width);
+            this.tempContext.rotate(-Math.PI / 2);
+        }
+        
+        this.tempContext.drawImage(canvas, 0, 0);
+        this.tempContext.restore();
+        
+        // Copy back to main canvas
+        canvas.width = this.tempCanvas.width;
+        canvas.height = this.tempCanvas.height;
+        context.drawImage(this.tempCanvas, 0, 0);
+        
+        // Add to history
+        this.addToHistory('rotate', { degrees });
+    }
+
+    /**
+     * Start crop selection
+     */
+    startCrop(container: HTMLElement): void {
+        if (!this.editorState.isEditing) return;
+        
+        // Create crop overlay
+        this.cropOverlay = document.createElement('div');
+        this.cropOverlay.className = 'crop-overlay';
+        this.cropOverlay.style.cssText = `
+            position: absolute;
+            border: 2px dashed #fff;
+            background: rgba(0, 0, 0, 0.3);
+            cursor: move;
+            z-index: 1000;
+        `;
+        
+        // Create resize handles
+        this.cropHandles = [];
+        const handlePositions = ['nw', 'n', 'ne', 'e', 'se', 's', 'sw', 'w'];
+        
+        handlePositions.forEach(pos => {
+            const handle = document.createElement('div');
+            handle.className = `crop-handle crop-handle-${pos}`;
+            handle.dataset.position = pos;
+            handle.style.cssText = `
+                position: absolute;
+                width: 10px;
+                height: 10px;
+                background: white;
+                border: 1px solid #333;
+                z-index: 1001;
+            `;
+            
+            // Position handles
+            switch (pos) {
+                case 'nw':
+                    handle.style.top = '-5px';
+                    handle.style.left = '-5px';
+                    handle.style.cursor = 'nw-resize';
+                    break;
+                case 'n':
+                    handle.style.top = '-5px';
+                    handle.style.left = '50%';
+                    handle.style.transform = 'translateX(-50%)';
+                    handle.style.cursor = 'n-resize';
+                    break;
+                case 'ne':
+                    handle.style.top = '-5px';
+                    handle.style.right = '-5px';
+                    handle.style.cursor = 'ne-resize';
+                    break;
+                case 'e':
+                    handle.style.top = '50%';
+                    handle.style.right = '-5px';
+                    handle.style.transform = 'translateY(-50%)';
+                    handle.style.cursor = 'e-resize';
+                    break;
+                case 'se':
+                    handle.style.bottom = '-5px';
+                    handle.style.right = '-5px';
+                    handle.style.cursor = 'se-resize';
+                    break;
+                case 's':
+                    handle.style.bottom = '-5px';
+                    handle.style.left = '50%';
+                    handle.style.transform = 'translateX(-50%)';
+                    handle.style.cursor = 's-resize';
+                    break;
+                case 'sw':
+                    handle.style.bottom = '-5px';
+                    handle.style.left = '-5px';
+                    handle.style.cursor = 'sw-resize';
+                    break;
+                case 'w':
+                    handle.style.top = '50%';
+                    handle.style.left = '-5px';
+                    handle.style.transform = 'translateY(-50%)';
+                    handle.style.cursor = 'w-resize';
+                    break;
+            }
+            
+            this.cropOverlay.appendChild(handle);
+            this.cropHandles!.push(handle);
+        });
+        
+        // Set initial crop area (80% of image)
+        const canvasRect = this.editorState.canvas.getBoundingClientRect();
+        const initialSize = Math.min(canvasRect.width, canvasRect.height) * 0.8;
+        const initialX = (canvasRect.width - initialSize) / 2;
+        const initialY = (canvasRect.height - initialSize) / 2;
+        
+        this.cropArea = {
+            x: initialX,
+            y: initialY,
+            width: initialSize,
+            height: initialSize
+        };
+        
+        this.updateCropOverlay();
+        container.appendChild(this.cropOverlay);
+        
+        // Setup drag handlers
+        this.setupCropHandlers();
+    }
+
+    /**
+     * Setup crop interaction handlers
+     */
+    private setupCropHandlers(): void {
+        if (!this.cropOverlay) return;
+        
+        // Drag to move
+        this.cropOverlay.addEventListener('mousedown', (e) => {
+            if ((e.target as HTMLElement).classList.contains('crop-handle')) return;
+            
+            this.isDraggingCrop = true;
+            this.dragStartX = e.clientX;
+            this.dragStartY = e.clientY;
+            
+            const handleMove = (e: MouseEvent) => {
+                if (!this.isDraggingCrop || !this.cropArea) return;
+                
+                const deltaX = e.clientX - this.dragStartX;
+                const deltaY = e.clientY - this.dragStartY;
+                
+                this.cropArea.x += deltaX;
+                this.cropArea.y += deltaY;
+                
+                this.dragStartX = e.clientX;
+                this.dragStartY = e.clientY;
+                
+                this.updateCropOverlay();
+            };
+            
+            const handleUp = () => {
+                this.isDraggingCrop = false;
+                document.removeEventListener('mousemove', handleMove);
+                document.removeEventListener('mouseup', handleUp);
+            };
+            
+            document.addEventListener('mousemove', handleMove);
+            document.addEventListener('mouseup', handleUp);
+        });
+        
+        // Resize handles
+        this.cropHandles?.forEach(handle => {
+            handle.addEventListener('mousedown', (e) => {
+                e.stopPropagation();
+                
+                const position = handle.dataset.position!;
+                const startX = e.clientX;
+                const startY = e.clientY;
+                const startCrop = { ...this.cropArea! };
+                
+                const handleResize = (e: MouseEvent) => {
+                    if (!this.cropArea) return;
+                    
+                    const deltaX = e.clientX - startX;
+                    const deltaY = e.clientY - startY;
+                    
+                    switch (position) {
+                        case 'nw':
+                            this.cropArea.x = startCrop.x + deltaX;
+                            this.cropArea.y = startCrop.y + deltaY;
+                            this.cropArea.width = startCrop.width - deltaX;
+                            this.cropArea.height = startCrop.height - deltaY;
+                            break;
+                        case 'n':
+                            this.cropArea.y = startCrop.y + deltaY;
+                            this.cropArea.height = startCrop.height - deltaY;
+                            break;
+                        case 'ne':
+                            this.cropArea.y = startCrop.y + deltaY;
+                            this.cropArea.width = startCrop.width + deltaX;
+                            this.cropArea.height = startCrop.height - deltaY;
+                            break;
+                        case 'e':
+                            this.cropArea.width = startCrop.width + deltaX;
+                            break;
+                        case 'se':
+                            this.cropArea.width = startCrop.width + deltaX;
+                            this.cropArea.height = startCrop.height + deltaY;
+                            break;
+                        case 's':
+                            this.cropArea.height = startCrop.height + deltaY;
+                            break;
+                        case 'sw':
+                            this.cropArea.x = startCrop.x + deltaX;
+                            this.cropArea.width = startCrop.width - deltaX;
+                            this.cropArea.height = startCrop.height + deltaY;
+                            break;
+                        case 'w':
+                            this.cropArea.x = startCrop.x + deltaX;
+                            this.cropArea.width = startCrop.width - deltaX;
+                            break;
+                    }
+                    
+                    // Ensure minimum size
+                    this.cropArea.width = Math.max(50, this.cropArea.width);
+                    this.cropArea.height = Math.max(50, this.cropArea.height);
+                    
+                    this.updateCropOverlay();
+                };
+                
+                const handleUp = () => {
+                    document.removeEventListener('mousemove', handleResize);
+                    document.removeEventListener('mouseup', handleUp);
+                };
+                
+                document.addEventListener('mousemove', handleResize);
+                document.addEventListener('mouseup', handleUp);
+            });
+        });
+    }
+
+    /**
+     * Update crop overlay position
+     */
+    private updateCropOverlay(): void {
+        if (!this.cropOverlay || !this.cropArea) return;
+        
+        this.cropOverlay.style.left = `${this.cropArea.x}px`;
+        this.cropOverlay.style.top = `${this.cropArea.y}px`;
+        this.cropOverlay.style.width = `${this.cropArea.width}px`;
+        this.cropOverlay.style.height = `${this.cropArea.height}px`;
+    }
+
+    /**
+     * Apply crop
+     */
+    applyCrop(): void {
+        if (!this.editorState.isEditing || !this.cropArea) return;
+        
+        const { canvas, context } = this.editorState;
+        const canvasRect = canvas.getBoundingClientRect();
+        
+        // Convert crop area from screen to canvas coordinates
+        const scaleX = canvas.width / canvasRect.width;
+        const scaleY = canvas.height / canvasRect.height;
+        
+        const cropX = this.cropArea.x * scaleX;
+        const cropY = this.cropArea.y * scaleY;
+        const cropWidth = this.cropArea.width * scaleX;
+        const cropHeight = this.cropArea.height * scaleY;
+        
+        // Get cropped image data
+        const imageData = context.getImageData(cropX, cropY, cropWidth, cropHeight);
+        
+        // Resize canvas and put cropped image
+        canvas.width = cropWidth;
+        canvas.height = cropHeight;
+        context.putImageData(imageData, 0, 0);
+        
+        // Clean up crop overlay
+        this.cancelCrop();
+        
+        // Add to history
+        this.addToHistory('crop', {
+            x: cropX,
+            y: cropY,
+            width: cropWidth,
+            height: cropHeight
+        });
+    }
+
+    /**
+     * Cancel crop
+     */
+    cancelCrop(): void {
+        if (this.cropOverlay) {
+            this.cropOverlay.remove();
+            this.cropOverlay = undefined;
+        }
+        this.cropHandles = undefined;
+        this.cropArea = null;
+    }
+
+    /**
+     * Apply brightness adjustment
+     */
+    applyBrightness(value: number): void {
+        if (!this.editorState.isEditing) return;
+        
+        this.currentFilters.brightness = value;
+        this.applyFilters();
+    }
+
+    /**
+     * Apply contrast adjustment
+     */
+    applyContrast(value: number): void {
+        if (!this.editorState.isEditing) return;
+        
+        this.currentFilters.contrast = value;
+        this.applyFilters();
+    }
+
+    /**
+     * Apply saturation adjustment
+     */
+    applySaturation(value: number): void {
+        if (!this.editorState.isEditing) return;
+        
+        this.currentFilters.saturation = value;
+        this.applyFilters();
+    }
+
+    /**
+     * Apply all filters
+     */
+    private applyFilters(): void {
+        const { canvas, context, originalImage } = this.editorState;
+        
+        if (!originalImage) return;
+        
+        // Clear canvas and redraw original
+        context.clearRect(0, 0, canvas.width, canvas.height);
+        context.drawImage(originalImage, 0, 0, canvas.width, canvas.height);
+        
+        // Get image data
+        const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
+        const data = imageData.data;
+        
+        // Apply brightness
+        if (this.currentFilters.brightness) {
+            const brightness = this.currentFilters.brightness * 2.55; // Convert to 0-255 range
+            for (let i = 0; i < data.length; i += 4) {
+                data[i] = Math.min(255, Math.max(0, data[i] + brightness));
+                data[i + 1] = Math.min(255, Math.max(0, data[i + 1] + brightness));
+                data[i + 2] = Math.min(255, Math.max(0, data[i + 2] + brightness));
+            }
+        }
+        
+        // Apply contrast
+        if (this.currentFilters.contrast) {
+            const factor = (259 * (this.currentFilters.contrast + 255)) / (255 * (259 - this.currentFilters.contrast));
+            for (let i = 0; i < data.length; i += 4) {
+                data[i] = Math.min(255, Math.max(0, factor * (data[i] - 128) + 128));
+                data[i + 1] = Math.min(255, Math.max(0, factor * (data[i + 1] - 128) + 128));
+                data[i + 2] = Math.min(255, Math.max(0, factor * (data[i + 2] - 128) + 128));
+            }
+        }
+        
+        // Apply saturation
+        if (this.currentFilters.saturation) {
+            const saturation = this.currentFilters.saturation / 100;
+            for (let i = 0; i < data.length; i += 4) {
+                const gray = 0.2989 * data[i] + 0.5870 * data[i + 1] + 0.1140 * data[i + 2];
+                data[i] = Math.min(255, Math.max(0, gray + saturation * (data[i] - gray)));
+                data[i + 1] = Math.min(255, Math.max(0, gray + saturation * (data[i + 1] - gray)));
+                data[i + 2] = Math.min(255, Math.max(0, gray + saturation * (data[i + 2] - gray)));
+            }
+        }
+        
+        // Put modified image data back
+        context.putImageData(imageData, 0, 0);
+    }
+
+    /**
+     * Apply blur effect
+     */
+    applyBlur(radius: number): void {
+        if (!this.editorState.isEditing) return;
+        
+        const { canvas, context } = this.editorState;
+        
+        // Use CSS filter for performance
+        context.filter = `blur(${radius}px)`;
+        context.drawImage(canvas, 0, 0);
+        context.filter = 'none';
+        
+        this.addToHistory('blur', { radius });
+    }
+
+    /**
+     * Apply sharpen effect
+     */
+    applySharpen(amount: number): void {
+        if (!this.editorState.isEditing) return;
+        
+        const { canvas, context } = this.editorState;
+        const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
+        const data = imageData.data;
+        const width = canvas.width;
+        const height = canvas.height;
+        
+        // Create copy of original data
+        const original = new Uint8ClampedArray(data);
+        
+        // Sharpen kernel
+        const kernel = [
+            0, -1, 0,
+            -1, 5 + amount / 25, -1,
+            0, -1, 0
+        ];
+        
+        // Apply convolution
+        for (let y = 1; y < height - 1; y++) {
+            for (let x = 1; x < width - 1; x++) {
+                const idx = (y * width + x) * 4;
+                
+                for (let c = 0; c < 3; c++) {
+                    let sum = 0;
+                    for (let ky = -1; ky <= 1; ky++) {
+                        for (let kx = -1; kx <= 1; kx++) {
+                            const kidx = ((y + ky) * width + (x + kx)) * 4;
+                            sum += original[kidx + c] * kernel[(ky + 1) * 3 + (kx + 1)];
+                        }
+                    }
+                    data[idx + c] = Math.min(255, Math.max(0, sum));
+                }
+            }
+        }
+        
+        context.putImageData(imageData, 0, 0);
+        this.addToHistory('sharpen', { amount });
+    }
+
+    /**
+     * Undo last operation
+     */
+    undo(): void {
+        if (!this.editorState.isEditing || this.editorState.historyIndex <= 0) return;
+        
+        this.editorState.historyIndex--;
+        this.replayHistory();
+    }
+
+    /**
+     * Redo operation
+     */
+    redo(): void {
+        if (!this.editorState.isEditing || 
+            this.editorState.historyIndex >= this.editorState.history.length - 1) return;
+        
+        this.editorState.historyIndex++;
+        this.replayHistory();
+    }
+
+    /**
+     * Replay history up to current index
+     */
+    private replayHistory(): void {
+        const { canvas, context, originalImage, history, historyIndex } = this.editorState;
+        
+        if (!originalImage) return;
+        
+        // Reset to original
+        canvas.width = originalImage.naturalWidth;
+        canvas.height = originalImage.naturalHeight;
+        context.drawImage(originalImage, 0, 0);
+        
+        // Replay operations
+        for (let i = 0; i <= historyIndex; i++) {
+            const entry = history[i];
+            // Apply operation based on entry
+            // Note: This is simplified - actual implementation would need to store and replay exact operations
+        }
+    }
+
+    /**
+     * Add operation to history
+     */
+    private addToHistory(operation: EditOperation, params: any): void {
+        // Remove any operations after current index
+        this.editorState.history = this.editorState.history.slice(0, this.editorState.historyIndex + 1);
+        
+        // Add new operation
+        this.editorState.history.push({
+            operation,
+            params,
+            timestamp: new Date()
+        });
+        
+        this.editorState.historyIndex++;
+        
+        // Limit history size
+        if (this.editorState.history.length > 50) {
+            this.editorState.history.shift();
+            this.editorState.historyIndex--;
+        }
+    }
+
+    /**
+     * Save edited image
+     */
+    async saveImage(noteId?: string): Promise<Blob> {
+        if (!this.editorState.isEditing) {
+            throw new ImageError(
+                ImageErrorType.INVALID_INPUT,
+                'No image being edited'
+            );
+        }
+        
+        return new Promise((resolve, reject) => {
+            this.editorState.canvas.toBlob((blob) => {
+                if (blob) {
+                    resolve(blob);
+                    
+                    if (noteId) {
+                        // Optionally save to server
+                        this.saveToServer(noteId, blob);
+                    }
+                } else {
+                    reject(new Error('Failed to create blob'));
+                }
+            }, 'image/png');
+        });
+    }
+
+    /**
+     * Save edited image to server
+     */
+    private async saveToServer(noteId: string, blob: Blob): Promise<void> {
+        try {
+            const formData = new FormData();
+            formData.append('image', blob, 'edited.png');
+            
+            await server.upload(`notes/${noteId}/image`, formData);
+            toastService.showMessage('Image saved successfully');
+        } catch (error) {
+            console.error('Failed to save image:', error);
+            toastService.showError('Failed to save image');
+        }
+    }
+
+    /**
+     * Reset to original image
+     */
+    reset(): void {
+        if (!this.editorState.isEditing || !this.editorState.originalImage) return;
+        
+        const { canvas, context, originalImage } = this.editorState;
+        
+        canvas.width = originalImage.naturalWidth;
+        canvas.height = originalImage.naturalHeight;
+        context.drawImage(originalImage, 0, 0);
+        
+        this.currentFilters = {};
+        this.editorState.history = [];
+        this.editorState.historyIndex = -1;
+    }
+
+    /**
+     * Stop editing and clean up resources
+     */
+    stopEditing(): void {
+        this.cancelCrop();
+        
+        // Request garbage collection after cleanup
+        MemoryMonitor.requestGarbageCollection();
+        
+        // Clean up canvas memory
+        if (this.editorState.canvas) {
+            this.editorState.context.clearRect(0, 0, this.editorState.canvas.width, this.editorState.canvas.height);
+            this.editorState.canvas.width = 0;
+            this.editorState.canvas.height = 0;
+        }
+        
+        if (this.tempCanvas) {
+            this.tempContext.clearRect(0, 0, this.tempCanvas.width, this.tempCanvas.height);
+            this.tempCanvas.width = 0;
+            this.tempCanvas.height = 0;
+        }
+        
+        // Release image references
+        if (this.editorState.originalImage) {
+            this.editorState.originalImage.src = '';
+        }
+        if (this.editorState.currentImage) {
+            this.editorState.currentImage.src = '';
+        }
+        
+        this.editorState.isEditing = false;
+        this.editorState.originalImage = null;
+        this.editorState.currentImage = null;
+        this.editorState.history = [];
+        this.editorState.historyIndex = -1;
+        this.currentFilters = {};
+    }
+
+    /**
+     * Load image from URL
+     */
+    private loadImage(src: string): Promise<HTMLImageElement> {
+        return new Promise((resolve, reject) => {
+            const img = new Image();
+            img.crossOrigin = 'anonymous';
+            img.onload = () => resolve(img);
+            img.onerror = () => reject(new Error(`Failed to load image: ${src}`));
+            img.src = src;
+        });
+    }
+
+    /**
+     * Check if can undo
+     */
+    canUndo(): boolean {
+        return this.editorState.historyIndex > 0;
+    }
+
+    /**
+     * Check if can redo
+     */
+    canRedo(): boolean {
+        return this.editorState.historyIndex < this.editorState.history.length - 1;
+    }
+
+    /**
+     * Get current canvas
+     */
+    getCanvas(): HTMLCanvasElement {
+        return this.editorState.canvas;
+    }
+
+    /**
+     * Check if editing
+     */
+    isEditing(): boolean {
+        return this.editorState.isEditing;
+    }
+}
+
+export default ImageEditorService.getInstance();

apps/client/src/services/image_error_handler.ts

@@ -0,0 +1,369 @@
+/**
+ * Error Handler for Image Processing Operations
+ * Provides error boundaries and validation for image-related operations
+ */
+
+import toastService from './toast.js';
+
+/**
+ * Error types for image operations
+ */
+export enum ImageErrorType {
+    INVALID_INPUT = 'INVALID_INPUT',
+    SIZE_LIMIT_EXCEEDED = 'SIZE_LIMIT_EXCEEDED',
+    MEMORY_ERROR = 'MEMORY_ERROR',
+    PROCESSING_ERROR = 'PROCESSING_ERROR',
+    NETWORK_ERROR = 'NETWORK_ERROR',
+    SECURITY_ERROR = 'SECURITY_ERROR'
+}
+
+/**
+ * Custom error class for image operations
+ */
+export class ImageError extends Error {
+    constructor(
+        public type: ImageErrorType,
+        message: string,
+        public details?: any
+    ) {
+        super(message);
+        this.name = 'ImageError';
+    }
+}
+
+/**
+ * Input validation utilities
+ */
+export class ImageValidator {
+    private static readonly MAX_FILE_SIZE = 100 * 1024 * 1024; // 100MB
+    private static readonly ALLOWED_MIME_TYPES = [
+        'image/jpeg',
+        'image/jpg',
+        'image/png',
+        'image/gif',
+        'image/webp',
+        'image/svg+xml',
+        'image/bmp'
+    ];
+    private static readonly MAX_DIMENSION = 16384;
+    private static readonly MAX_AREA = 100000000; // 100 megapixels
+
+    /**
+     * Validate file input
+     */
+    static validateFile(file: File): void {
+        // Check file size
+        if (file.size > this.MAX_FILE_SIZE) {
+            throw new ImageError(
+                ImageErrorType.SIZE_LIMIT_EXCEEDED,
+                `File size exceeds maximum allowed size of ${this.MAX_FILE_SIZE / 1024 / 1024}MB`,
+                { fileSize: file.size, maxSize: this.MAX_FILE_SIZE }
+            );
+        }
+
+        // Check MIME type
+        if (!this.ALLOWED_MIME_TYPES.includes(file.type)) {
+            throw new ImageError(
+                ImageErrorType.INVALID_INPUT,
+                `File type ${file.type} is not supported`,
+                { fileType: file.type, allowedTypes: this.ALLOWED_MIME_TYPES }
+            );
+        }
+    }
+
+    /**
+     * Validate image dimensions
+     */
+    static validateDimensions(width: number, height: number): void {
+        if (width <= 0 || height <= 0) {
+            throw new ImageError(
+                ImageErrorType.INVALID_INPUT,
+                'Invalid image dimensions',
+                { width, height }
+            );
+        }
+
+        if (width > this.MAX_DIMENSION || height > this.MAX_DIMENSION) {
+            throw new ImageError(
+                ImageErrorType.SIZE_LIMIT_EXCEEDED,
+                `Image dimensions exceed maximum allowed size of ${this.MAX_DIMENSION}px`,
+                { width, height, maxDimension: this.MAX_DIMENSION }
+            );
+        }
+
+        if (width * height > this.MAX_AREA) {
+            throw new ImageError(
+                ImageErrorType.SIZE_LIMIT_EXCEEDED,
+                `Image area exceeds maximum allowed area of ${this.MAX_AREA / 1000000} megapixels`,
+                { area: width * height, maxArea: this.MAX_AREA }
+            );
+        }
+    }
+
+    /**
+     * Validate URL
+     */
+    static validateUrl(url: string): void {
+        try {
+            const parsedUrl = new URL(url);
+            
+            // Check protocol
+            if (!['http:', 'https:', 'data:', 'blob:'].includes(parsedUrl.protocol)) {
+                throw new ImageError(
+                    ImageErrorType.SECURITY_ERROR,
+                    `Unsupported protocol: ${parsedUrl.protocol}`,
+                    { url, protocol: parsedUrl.protocol }
+                );
+            }
+
+            // Additional security checks for data URLs
+            if (parsedUrl.protocol === 'data:') {
+                const [header] = url.split(',');
+                if (!header.includes('image/')) {
+                    throw new ImageError(
+                        ImageErrorType.INVALID_INPUT,
+                        'Data URL does not contain image data',
+                        { url: url.substring(0, 100) }
+                    );
+                }
+            }
+        } catch (error) {
+            if (error instanceof ImageError) {
+                throw error;
+            }
+            throw new ImageError(
+                ImageErrorType.INVALID_INPUT,
+                'Invalid URL format',
+                { url, originalError: error }
+            );
+        }
+    }
+
+    /**
+     * Sanitize filename
+     */
+    static sanitizeFilename(filename: string): string {
+        // Remove path traversal attempts
+        filename = filename.replace(/\.\./g, '');
+        filename = filename.replace(/[\/\\]/g, '_');
+        
+        // Remove special characters except dots and dashes
+        filename = filename.replace(/[^a-zA-Z0-9._-]/g, '_');
+        
+        // Limit length
+        if (filename.length > 255) {
+            const ext = filename.split('.').pop();
+            filename = filename.substring(0, 250) + '.' + ext;
+        }
+        
+        return filename;
+    }
+}
+
+/**
+ * Error boundary wrapper for async operations
+ */
+export async function withErrorBoundary<T>(
+    operation: () => Promise<T>,
+    errorHandler?: (error: Error) => void
+): Promise<T | null> {
+    try {
+        return await operation();
+    } catch (error) {
+        const imageError = error instanceof ImageError 
+            ? error 
+            : new ImageError(
+                ImageErrorType.PROCESSING_ERROR,
+                error instanceof Error ? error.message : 'Unknown error occurred',
+                { originalError: error }
+            );
+
+        // Log error
+        console.error('[Image Error]', imageError.type, imageError.message, imageError.details);
+
+        // Show user-friendly message
+        switch (imageError.type) {
+            case ImageErrorType.SIZE_LIMIT_EXCEEDED:
+                toastService.showError('Image is too large to process');
+                break;
+            case ImageErrorType.INVALID_INPUT:
+                toastService.showError('Invalid image or input provided');
+                break;
+            case ImageErrorType.MEMORY_ERROR:
+                toastService.showError('Not enough memory to process image');
+                break;
+            case ImageErrorType.SECURITY_ERROR:
+                toastService.showError('Security violation detected');
+                break;
+            case ImageErrorType.NETWORK_ERROR:
+                toastService.showError('Network error occurred');
+                break;
+            default:
+                toastService.showError('Failed to process image');
+        }
+
+        // Call custom error handler if provided
+        if (errorHandler) {
+            errorHandler(imageError);
+        }
+
+        return null;
+    }
+}
+
+/**
+ * Memory monitoring utilities
+ */
+export class MemoryMonitor {
+    private static readonly WARNING_THRESHOLD = 0.8; // 80% of available memory
+    
+    /**
+     * Check if memory is available for operation
+     */
+    static checkMemoryAvailable(estimatedBytes: number): boolean {
+        if ('memory' in performance && (performance as any).memory) {
+            const memory = (performance as any).memory;
+            const used = memory.usedJSHeapSize;
+            const limit = memory.jsHeapSizeLimit;
+            const available = limit - used;
+            
+            if (estimatedBytes > available * this.WARNING_THRESHOLD) {
+                console.warn(`Memory warning: Estimated ${estimatedBytes} bytes needed, ${available} bytes available`);
+                return false;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Estimate memory needed for image
+     */
+    static estimateImageMemory(width: number, height: number, channels: number = 4): number {
+        // Each pixel uses 4 bytes (RGBA) or specified channels
+        return width * height * channels;
+    }
+
+    /**
+     * Force garbage collection if available
+     */
+    static requestGarbageCollection(): void {
+        if (typeof (globalThis as any).gc === 'function') {
+            (globalThis as any).gc();
+        }
+    }
+}
+
+/**
+ * Web Worker support for heavy operations
+ */
+export class ImageWorkerPool {
+    private workers: Worker[] = [];
+    private taskQueue: Array<{
+        data: any;
+        resolve: (value: any) => void;
+        reject: (error: any) => void;
+    }> = [];
+    private busyWorkers = new Set<Worker>();
+
+    constructor(
+        private workerScript: string,
+        private poolSize: number = navigator.hardwareConcurrency || 4
+    ) {
+        this.initializeWorkers();
+    }
+
+    private initializeWorkers(): void {
+        for (let i = 0; i < this.poolSize; i++) {
+            try {
+                const worker = new Worker(this.workerScript);
+                worker.addEventListener('message', (e) => this.handleWorkerMessage(worker, e));
+                worker.addEventListener('error', (e) => this.handleWorkerError(worker, e));
+                this.workers.push(worker);
+            } catch (error) {
+                console.error('Failed to create worker:', error);
+            }
+        }
+    }
+
+    private handleWorkerMessage(worker: Worker, event: MessageEvent): void {
+        this.busyWorkers.delete(worker);
+        
+        // Process next task if available
+        if (this.taskQueue.length > 0) {
+            const task = this.taskQueue.shift()!;
+            this.executeTask(worker, task);
+        }
+    }
+
+    private handleWorkerError(worker: Worker, event: ErrorEvent): void {
+        this.busyWorkers.delete(worker);
+        console.error('Worker error:', event);
+    }
+
+    private executeTask(
+        worker: Worker,
+        task: { data: any; resolve: (value: any) => void; reject: (error: any) => void }
+    ): void {
+        this.busyWorkers.add(worker);
+        
+        const messageHandler = (e: MessageEvent) => {
+            worker.removeEventListener('message', messageHandler);
+            worker.removeEventListener('error', errorHandler);
+            this.busyWorkers.delete(worker);
+            task.resolve(e.data);
+            
+            // Process next task
+            if (this.taskQueue.length > 0) {
+                const nextTask = this.taskQueue.shift()!;
+                this.executeTask(worker, nextTask);
+            }
+        };
+        
+        const errorHandler = (e: ErrorEvent) => {
+            worker.removeEventListener('message', messageHandler);
+            worker.removeEventListener('error', errorHandler);
+            this.busyWorkers.delete(worker);
+            task.reject(e);
+            
+            // Process next task
+            if (this.taskQueue.length > 0) {
+                const nextTask = this.taskQueue.shift()!;
+                this.executeTask(worker, nextTask);
+            }
+        };
+        
+        worker.addEventListener('message', messageHandler);
+        worker.addEventListener('error', errorHandler);
+        worker.postMessage(task.data);
+    }
+
+    async process(data: any): Promise<any> {
+        return new Promise((resolve, reject) => {
+            // Find available worker
+            const availableWorker = this.workers.find(w => !this.busyWorkers.has(w));
+            
+            if (availableWorker) {
+                this.executeTask(availableWorker, { data, resolve, reject });
+            } else {
+                // Queue task
+                this.taskQueue.push({ data, resolve, reject });
+            }
+        });
+    }
+
+    terminate(): void {
+        this.workers.forEach(worker => worker.terminate());
+        this.workers = [];
+        this.taskQueue = [];
+        this.busyWorkers.clear();
+    }
+}
+
+export default {
+    ImageError,
+    ImageErrorType,
+    ImageValidator,
+    MemoryMonitor,
+    ImageWorkerPool,
+    withErrorBoundary
+};

apps/client/src/services/image_exif.ts

@@ -0,0 +1,839 @@
+/**
+ * EXIF Data Viewer Module for Trilium Notes
+ * Extracts and displays EXIF metadata from images
+ */
+
+/**
+ * EXIF data structure
+ */
+export interface ExifData {
+    // Image information
+    make?: string;
+    model?: string;
+    software?: string;
+    dateTime?: Date;
+    dateTimeOriginal?: Date;
+    dateTimeDigitized?: Date;
+    
+    // Camera settings
+    exposureTime?: string;
+    fNumber?: number;
+    exposureProgram?: string;
+    iso?: number;
+    shutterSpeedValue?: string;
+    apertureValue?: number;
+    brightnessValue?: number;
+    exposureBiasValue?: number;
+    maxApertureValue?: number;
+    meteringMode?: string;
+    flash?: string;
+    focalLength?: number;
+    focalLengthIn35mm?: number;
+    
+    // Image properties
+    imageWidth?: number;
+    imageHeight?: number;
+    orientation?: number;
+    xResolution?: number;
+    yResolution?: number;
+    resolutionUnit?: string;
+    colorSpace?: string;
+    whiteBalance?: string;
+    
+    // GPS information
+    gpsLatitude?: number;
+    gpsLongitude?: number;
+    gpsAltitude?: number;
+    gpsTimestamp?: Date;
+    gpsSpeed?: number;
+    gpsDirection?: number;
+    
+    // Other metadata
+    artist?: string;
+    copyright?: string;
+    userComment?: string;
+    imageDescription?: string;
+    lensModel?: string;
+    lensMake?: string;
+    
+    // Raw data
+    raw?: Record<string, any>;
+}
+
+/**
+ * EXIF tag definitions
+ */
+const EXIF_TAGS: Record<number, string> = {
+    0x010F: 'make',
+    0x0110: 'model',
+    0x0131: 'software',
+    0x0132: 'dateTime',
+    0x829A: 'exposureTime',
+    0x829D: 'fNumber',
+    0x8822: 'exposureProgram',
+    0x8827: 'iso',
+    0x9003: 'dateTimeOriginal',
+    0x9004: 'dateTimeDigitized',
+    0x9201: 'shutterSpeedValue',
+    0x9202: 'apertureValue',
+    0x9203: 'brightnessValue',
+    0x9204: 'exposureBiasValue',
+    0x9205: 'maxApertureValue',
+    0x9207: 'meteringMode',
+    0x9209: 'flash',
+    0x920A: 'focalLength',
+    0xA002: 'imageWidth',
+    0xA003: 'imageHeight',
+    0x0112: 'orientation',
+    0x011A: 'xResolution',
+    0x011B: 'yResolution',
+    0x0128: 'resolutionUnit',
+    0xA001: 'colorSpace',
+    0xA403: 'whiteBalance',
+    0x8298: 'copyright',
+    0x013B: 'artist',
+    0x9286: 'userComment',
+    0x010E: 'imageDescription',
+    0xA434: 'lensModel',
+    0xA433: 'lensMake',
+    0xA432: 'focalLengthIn35mm'
+};
+
+/**
+ * GPS tag definitions
+ */
+const GPS_TAGS: Record<number, string> = {
+    0x0001: 'gpsLatitudeRef',
+    0x0002: 'gpsLatitude',
+    0x0003: 'gpsLongitudeRef',
+    0x0004: 'gpsLongitude',
+    0x0005: 'gpsAltitudeRef',
+    0x0006: 'gpsAltitude',
+    0x0007: 'gpsTimestamp',
+    0x000D: 'gpsSpeed',
+    0x0010: 'gpsDirection'
+};
+
+/**
+ * ImageExifService extracts and manages EXIF metadata from images
+ */
+class ImageExifService {
+    private static instance: ImageExifService;
+    private exifCache: Map<string, ExifData> = new Map();
+    private cacheOrder: string[] = []; // Track cache insertion order for LRU
+    private readonly MAX_CACHE_SIZE = 50; // Maximum number of cached entries
+    private readonly MAX_BUFFER_SIZE = 100 * 1024 * 1024; // 100MB max buffer size
+
+    private constructor() {}
+
+    static getInstance(): ImageExifService {
+        if (!ImageExifService.instance) {
+            ImageExifService.instance = new ImageExifService();
+        }
+        return ImageExifService.instance;
+    }
+
+    /**
+     * Extract EXIF data from image URL or file
+     */
+    async extractExifData(source: string | File | Blob): Promise<ExifData | null> {
+        try {
+            // Check cache if URL
+            if (typeof source === 'string' && this.exifCache.has(source)) {
+                // Move to end for LRU
+                this.updateCacheOrder(source);
+                return this.exifCache.get(source)!;
+            }
+
+            // Get array buffer with size validation
+            const buffer = await this.getArrayBuffer(source);
+            
+            // Validate buffer size
+            if (buffer.byteLength > this.MAX_BUFFER_SIZE) {
+                console.error('Buffer size exceeds maximum allowed size');
+                return null;
+            }
+            
+            // Parse EXIF data
+            const exifData = this.parseExifData(buffer);
+            
+            // Cache if URL with LRU eviction
+            if (typeof source === 'string' && exifData) {
+                this.addToCache(source, exifData);
+            }
+            
+            return exifData;
+        } catch (error) {
+            console.error('Failed to extract EXIF data:', error);
+            return null;
+        }
+    }
+
+    /**
+     * Get array buffer from various sources
+     */
+    private async getArrayBuffer(source: string | File | Blob): Promise<ArrayBuffer> {
+        if (source instanceof File || source instanceof Blob) {
+            return source.arrayBuffer();
+        } else {
+            const response = await fetch(source);
+            return response.arrayBuffer();
+        }
+    }
+
+    /**
+     * Parse EXIF data from array buffer
+     */
+    private parseExifData(buffer: ArrayBuffer): ExifData | null {
+        const dataView = new DataView(buffer);
+        
+        // Check for JPEG SOI marker
+        if (dataView.getUint16(0) !== 0xFFD8) {
+            return null; // Not a JPEG
+        }
+
+        // Find APP1 marker (EXIF)
+        let offset = 2;
+        let marker;
+        
+        while (offset < dataView.byteLength) {
+            marker = dataView.getUint16(offset);
+            
+            if (marker === 0xFFE1) {
+                // Found EXIF marker
+                return this.parseExifSegment(dataView, offset + 2);
+            }
+            
+            if ((marker & 0xFF00) !== 0xFF00) {
+                break; // Invalid marker
+            }
+            
+            offset += 2 + dataView.getUint16(offset + 2);
+        }
+        
+        return null;
+    }
+
+    /**
+     * Parse EXIF segment with bounds checking
+     */
+    private parseExifSegment(dataView: DataView, offset: number): ExifData | null {
+        // Bounds check
+        if (offset + 2 > dataView.byteLength) {
+            console.error('Invalid offset for EXIF segment');
+            return null;
+        }
+        
+        const length = dataView.getUint16(offset);
+        
+        // Validate segment length
+        if (offset + length > dataView.byteLength) {
+            console.error('EXIF segment length exceeds buffer size');
+            return null;
+        }
+        
+        // Check for "Exif\0\0" identifier with bounds check
+        if (offset + 6 > dataView.byteLength) {
+            console.error('Invalid EXIF header offset');
+            return null;
+        }
+        
+        const exifHeader = String.fromCharCode(
+            dataView.getUint8(offset + 2),
+            dataView.getUint8(offset + 3),
+            dataView.getUint8(offset + 4),
+            dataView.getUint8(offset + 5)
+        );
+        
+        if (exifHeader !== 'Exif') {
+            return null;
+        }
+        
+        // TIFF header offset
+        const tiffOffset = offset + 8;
+        
+        // Check byte order
+        const byteOrder = dataView.getUint16(tiffOffset);
+        const littleEndian = byteOrder === 0x4949; // 'II' for Intel
+        
+        if (byteOrder !== 0x4949 && byteOrder !== 0x4D4D) {
+            return null; // Invalid byte order
+        }
+        
+        // Parse IFD
+        const ifdOffset = this.getUint32(dataView, tiffOffset + 4, littleEndian);
+        const exifData = this.parseIFD(dataView, tiffOffset, tiffOffset + ifdOffset, littleEndian);
+        
+        // Parse GPS data if available
+        if (exifData.raw?.gpsIFDPointer) {
+            const gpsData = this.parseGPSIFD(
+                dataView,
+                tiffOffset,
+                tiffOffset + exifData.raw.gpsIFDPointer,
+                littleEndian
+            );
+            Object.assign(exifData, gpsData);
+        }
+        
+        return this.formatExifData(exifData);
+    }
+
+    /**
+     * Parse IFD (Image File Directory) with bounds checking
+     */
+    private parseIFD(
+        dataView: DataView,
+        tiffOffset: number,
+        ifdOffset: number,
+        littleEndian: boolean
+    ): ExifData {
+        // Bounds check for IFD offset
+        if (ifdOffset + 2 > dataView.byteLength) {
+            console.error('Invalid IFD offset');
+            return { raw: {} };
+        }
+        
+        const numEntries = this.getUint16(dataView, ifdOffset, littleEndian);
+        
+        // Validate number of entries
+        if (numEntries > 1000) { // Reasonable limit
+            console.error('Too many IFD entries');
+            return { raw: {} };
+        }
+        
+        const data: ExifData = { raw: {} };
+        
+        for (let i = 0; i < numEntries; i++) {
+            const entryOffset = ifdOffset + 2 + (i * 12);
+            
+            // Bounds check for entry
+            if (entryOffset + 12 > dataView.byteLength) {
+                console.warn('IFD entry exceeds buffer bounds');
+                break;
+            }
+            
+            const tag = this.getUint16(dataView, entryOffset, littleEndian);
+            const type = this.getUint16(dataView, entryOffset + 2, littleEndian);
+            const count = this.getUint32(dataView, entryOffset + 4, littleEndian);
+            const valueOffset = entryOffset + 8;
+            
+            const value = this.getTagValue(
+                dataView,
+                tiffOffset,
+                type,
+                count,
+                valueOffset,
+                littleEndian
+            );
+            
+            const tagName = EXIF_TAGS[tag];
+            if (tagName) {
+                (data as any)[tagName] = value;
+            }
+            
+            // Store raw value
+            data.raw![tag] = value;
+            
+            // Check for EXIF IFD pointer
+            if (tag === 0x8769) {
+                const exifIFDOffset = tiffOffset + value;
+                const exifData = this.parseIFD(dataView, tiffOffset, exifIFDOffset, littleEndian);
+                Object.assign(data, exifData);
+            }
+            
+            // Store GPS IFD pointer
+            if (tag === 0x8825) {
+                data.raw!.gpsIFDPointer = value;
+            }
+        }
+        
+        return data;
+    }
+
+    /**
+     * Parse GPS IFD
+     */
+    private parseGPSIFD(
+        dataView: DataView,
+        tiffOffset: number,
+        ifdOffset: number,
+        littleEndian: boolean
+    ): Partial<ExifData> {
+        const numEntries = this.getUint16(dataView, ifdOffset, littleEndian);
+        const gpsData: any = {};
+        
+        for (let i = 0; i < numEntries; i++) {
+            const entryOffset = ifdOffset + 2 + (i * 12);
+            
+            // Bounds check for entry
+            if (entryOffset + 12 > dataView.byteLength) {
+                console.warn('IFD entry exceeds buffer bounds');
+                break;
+            }
+            
+            const tag = this.getUint16(dataView, entryOffset, littleEndian);
+            const type = this.getUint16(dataView, entryOffset + 2, littleEndian);
+            const count = this.getUint32(dataView, entryOffset + 4, littleEndian);
+            const valueOffset = entryOffset + 8;
+            
+            const value = this.getTagValue(
+                dataView,
+                tiffOffset,
+                type,
+                count,
+                valueOffset,
+                littleEndian
+            );
+            
+            const tagName = GPS_TAGS[tag];
+            if (tagName) {
+                gpsData[tagName] = value;
+            }
+        }
+        
+        // Convert GPS coordinates
+        const result: Partial<ExifData> = {};
+        
+        if (gpsData.gpsLatitude && gpsData.gpsLatitudeRef) {
+            result.gpsLatitude = this.convertGPSCoordinate(
+                gpsData.gpsLatitude,
+                gpsData.gpsLatitudeRef
+            );
+        }
+        
+        if (gpsData.gpsLongitude && gpsData.gpsLongitudeRef) {
+            result.gpsLongitude = this.convertGPSCoordinate(
+                gpsData.gpsLongitude,
+                gpsData.gpsLongitudeRef
+            );
+        }
+        
+        if (gpsData.gpsAltitude) {
+            result.gpsAltitude = gpsData.gpsAltitude;
+        }
+        
+        return result;
+    }
+
+    /**
+     * Get tag value based on type
+     */
+    private getTagValue(
+        dataView: DataView,
+        tiffOffset: number,
+        type: number,
+        count: number,
+        offset: number,
+        littleEndian: boolean
+    ): any {
+        switch (type) {
+            case 1: // BYTE
+            case 7: // UNDEFINED
+                if (count === 1) {
+                    return dataView.getUint8(offset);
+                }
+                const bytes = [];
+                for (let i = 0; i < count; i++) {
+                    bytes.push(dataView.getUint8(offset + i));
+                }
+                return bytes;
+                
+            case 2: // ASCII
+                const stringOffset = count > 4 
+                    ? tiffOffset + this.getUint32(dataView, offset, littleEndian)
+                    : offset;
+                let str = '';
+                for (let i = 0; i < count - 1; i++) {
+                    const char = dataView.getUint8(stringOffset + i);
+                    if (char === 0) break;
+                    str += String.fromCharCode(char);
+                }
+                return str;
+                
+            case 3: // SHORT
+                if (count === 1) {
+                    return this.getUint16(dataView, offset, littleEndian);
+                }
+                const shorts = [];
+                const shortOffset = count > 2
+                    ? tiffOffset + this.getUint32(dataView, offset, littleEndian)
+                    : offset;
+                for (let i = 0; i < count; i++) {
+                    shorts.push(this.getUint16(dataView, shortOffset + i * 2, littleEndian));
+                }
+                return shorts;
+                
+            case 4: // LONG
+                if (count === 1) {
+                    return this.getUint32(dataView, offset, littleEndian);
+                }
+                const longs = [];
+                const longOffset = tiffOffset + this.getUint32(dataView, offset, littleEndian);
+                for (let i = 0; i < count; i++) {
+                    longs.push(this.getUint32(dataView, longOffset + i * 4, littleEndian));
+                }
+                return longs;
+                
+            case 5: // RATIONAL
+                const ratOffset = tiffOffset + this.getUint32(dataView, offset, littleEndian);
+                if (count === 1) {
+                    const num = this.getUint32(dataView, ratOffset, littleEndian);
+                    const den = this.getUint32(dataView, ratOffset + 4, littleEndian);
+                    return den === 0 ? 0 : num / den;
+                }
+                const rationals = [];
+                for (let i = 0; i < count; i++) {
+                    const num = this.getUint32(dataView, ratOffset + i * 8, littleEndian);
+                    const den = this.getUint32(dataView, ratOffset + i * 8 + 4, littleEndian);
+                    rationals.push(den === 0 ? 0 : num / den);
+                }
+                return rationals;
+                
+            default:
+                return null;
+        }
+    }
+
+    /**
+     * Convert GPS coordinate to decimal degrees
+     */
+    private convertGPSCoordinate(coord: number[], ref: string): number {
+        if (!coord || coord.length !== 3) return 0;
+        
+        const degrees = coord[0];
+        const minutes = coord[1];
+        const seconds = coord[2];
+        
+        let decimal = degrees + minutes / 60 + seconds / 3600;
+        
+        if (ref === 'S' || ref === 'W') {
+            decimal = -decimal;
+        }
+        
+        return decimal;
+    }
+
+    /**
+     * Format EXIF data for display
+     */
+    private formatExifData(data: ExifData): ExifData {
+        const formatted: ExifData = { ...data };
+        
+        // Format dates
+        if (formatted.dateTime) {
+            formatted.dateTime = this.parseExifDate(formatted.dateTime as any);
+        }
+        if (formatted.dateTimeOriginal) {
+            formatted.dateTimeOriginal = this.parseExifDate(formatted.dateTimeOriginal as any);
+        }
+        if (formatted.dateTimeDigitized) {
+            formatted.dateTimeDigitized = this.parseExifDate(formatted.dateTimeDigitized as any);
+        }
+        
+        // Format exposure time
+        if (formatted.exposureTime) {
+            const time = formatted.exposureTime as any;
+            if (typeof time === 'number') {
+                if (time < 1) {
+                    formatted.exposureTime = `1/${Math.round(1 / time)}`;
+                } else {
+                    formatted.exposureTime = `${time}s`;
+                }
+            }
+        }
+        
+        // Format exposure program
+        if (formatted.exposureProgram) {
+            const programs = [
+                'Not defined',
+                'Manual',
+                'Normal program',
+                'Aperture priority',
+                'Shutter priority',
+                'Creative program',
+                'Action program',
+                'Portrait mode',
+                'Landscape mode'
+            ];
+            const index = formatted.exposureProgram as any;
+            formatted.exposureProgram = programs[index] || 'Unknown';
+        }
+        
+        // Format metering mode
+        if (formatted.meteringMode) {
+            const modes = [
+                'Unknown',
+                'Average',
+                'Center-weighted average',
+                'Spot',
+                'Multi-spot',
+                'Pattern',
+                'Partial'
+            ];
+            const index = formatted.meteringMode as any;
+            formatted.meteringMode = modes[index] || 'Unknown';
+        }
+        
+        // Format flash
+        if (formatted.flash !== undefined) {
+            const flash = formatted.flash as any;
+            formatted.flash = (flash & 1) ? 'Flash fired' : 'Flash did not fire';
+        }
+        
+        return formatted;
+    }
+
+    /**
+     * Parse EXIF date string
+     */
+    private parseExifDate(dateStr: string): Date {
+        // EXIF date format: "YYYY:MM:DD HH:MM:SS"
+        const parts = dateStr.split(' ');
+        if (parts.length !== 2) return new Date(dateStr);
+        
+        const dateParts = parts[0].split(':');
+        const timeParts = parts[1].split(':');
+        
+        if (dateParts.length !== 3 || timeParts.length !== 3) {
+            return new Date(dateStr);
+        }
+        
+        return new Date(
+            parseInt(dateParts[0]),
+            parseInt(dateParts[1]) - 1,
+            parseInt(dateParts[2]),
+            parseInt(timeParts[0]),
+            parseInt(timeParts[1]),
+            parseInt(timeParts[2])
+        );
+    }
+
+    /**
+     * Get uint16 with endianness and bounds checking
+     */
+    private getUint16(dataView: DataView, offset: number, littleEndian: boolean): number {
+        if (offset + 2 > dataView.byteLength) {
+            console.error('Uint16 read exceeds buffer bounds');
+            return 0;
+        }
+        return dataView.getUint16(offset, littleEndian);
+    }
+
+    /**
+     * Get uint32 with endianness and bounds checking
+     */
+    private getUint32(dataView: DataView, offset: number, littleEndian: boolean): number {
+        if (offset + 4 > dataView.byteLength) {
+            console.error('Uint32 read exceeds buffer bounds');
+            return 0;
+        }
+        return dataView.getUint32(offset, littleEndian);
+    }
+
+    /**
+     * Create EXIF display panel
+     */
+    createExifPanel(exifData: ExifData): HTMLElement {
+        const panel = document.createElement('div');
+        panel.className = 'exif-panel';
+        panel.style.cssText = `
+            background: rgba(0, 0, 0, 0.9);
+            color: white;
+            padding: 15px;
+            border-radius: 8px;
+            max-width: 400px;
+            max-height: 500px;
+            overflow-y: auto;
+            font-size: 12px;
+        `;
+
+        const sections = [
+            {
+                title: 'Camera',
+                fields: ['make', 'model', 'lensModel']
+            },
+            {
+                title: 'Settings',
+                fields: ['exposureTime', 'fNumber', 'iso', 'focalLength', 'exposureProgram', 'meteringMode', 'flash']
+            },
+            {
+                title: 'Image',
+                fields: ['imageWidth', 'imageHeight', 'orientation', 'colorSpace', 'whiteBalance']
+            },
+            {
+                title: 'Date/Time',
+                fields: ['dateTimeOriginal', 'dateTime']
+            },
+            {
+                title: 'Location',
+                fields: ['gpsLatitude', 'gpsLongitude', 'gpsAltitude']
+            },
+            {
+                title: 'Other',
+                fields: ['software', 'artist', 'copyright', 'imageDescription']
+            }
+        ];
+
+        sections.forEach(section => {
+            const hasData = section.fields.some(field => (exifData as any)[field]);
+            if (!hasData) return;
+
+            const sectionDiv = document.createElement('div');
+            sectionDiv.style.marginBottom = '15px';
+            
+            const title = document.createElement('h4');
+            // Use textContent for safe title insertion
+            title.textContent = section.title;
+            title.style.cssText = 'margin: 0 0 8px 0; color: #4CAF50;';
+            title.setAttribute('aria-label', `Section: ${section.title}`);
+            sectionDiv.appendChild(title);
+
+            section.fields.forEach(field => {
+                const value = (exifData as any)[field];
+                if (!value) return;
+
+                const row = document.createElement('div');
+                row.style.cssText = 'display: flex; justify-content: space-between; margin: 4px 0;';
+                
+                const label = document.createElement('span');
+                // Use textContent for safe text insertion
+                label.textContent = this.formatFieldName(field) + ':';
+                label.style.color = '#aaa';
+                
+                const val = document.createElement('span');
+                // Use textContent for safe value insertion  
+                val.textContent = this.formatFieldValue(field, value);
+                val.style.textAlign = 'right';
+                
+                row.appendChild(label);
+                row.appendChild(val);
+                sectionDiv.appendChild(row);
+            });
+
+            panel.appendChild(sectionDiv);
+        });
+
+        // Add GPS map link if coordinates available
+        if (exifData.gpsLatitude && exifData.gpsLongitude) {
+            const mapLink = document.createElement('a');
+            mapLink.href = `https://www.google.com/maps?q=${exifData.gpsLatitude},${exifData.gpsLongitude}`;
+            mapLink.target = '_blank';
+            mapLink.textContent = 'View on Map';
+            mapLink.style.cssText = `
+                display: inline-block;
+                margin-top: 10px;
+                padding: 8px 12px;
+                background: #4CAF50;
+                color: white;
+                text-decoration: none;
+                border-radius: 4px;
+            `;
+            panel.appendChild(mapLink);
+        }
+
+        return panel;
+    }
+
+    /**
+     * Format field name for display
+     */
+    private formatFieldName(field: string): string {
+        const names: Record<string, string> = {
+            make: 'Camera Make',
+            model: 'Camera Model',
+            lensModel: 'Lens',
+            exposureTime: 'Shutter Speed',
+            fNumber: 'Aperture',
+            iso: 'ISO',
+            focalLength: 'Focal Length',
+            exposureProgram: 'Mode',
+            meteringMode: 'Metering',
+            flash: 'Flash',
+            imageWidth: 'Width',
+            imageHeight: 'Height',
+            orientation: 'Orientation',
+            colorSpace: 'Color Space',
+            whiteBalance: 'White Balance',
+            dateTimeOriginal: 'Date Taken',
+            dateTime: 'Date Modified',
+            gpsLatitude: 'Latitude',
+            gpsLongitude: 'Longitude',
+            gpsAltitude: 'Altitude',
+            software: 'Software',
+            artist: 'Artist',
+            copyright: 'Copyright',
+            imageDescription: 'Description'
+        };
+        return names[field] || field;
+    }
+
+    /**
+     * Format field value for display
+     */
+    private formatFieldValue(field: string, value: any): string {
+        if (value instanceof Date) {
+            return value.toLocaleString();
+        }
+        
+        switch (field) {
+            case 'fNumber':
+                return `f/${value}`;
+            case 'focalLength':
+                return `${value}mm`;
+            case 'gpsLatitude':
+            case 'gpsLongitude':
+                return value.toFixed(6) + '°';
+            case 'gpsAltitude':
+                return `${value.toFixed(1)}m`;
+            case 'imageWidth':
+            case 'imageHeight':
+                return `${value}px`;
+            default:
+                return String(value);
+        }
+    }
+
+    /**
+     * Add to cache with LRU eviction
+     */
+    private addToCache(key: string, data: ExifData): void {
+        // Remove from order if exists
+        const existingIndex = this.cacheOrder.indexOf(key);
+        if (existingIndex !== -1) {
+            this.cacheOrder.splice(existingIndex, 1);
+        }
+        
+        // Add to end
+        this.cacheOrder.push(key);
+        this.exifCache.set(key, data);
+        
+        // Evict oldest if over limit
+        while (this.cacheOrder.length > this.MAX_CACHE_SIZE) {
+            const oldestKey = this.cacheOrder.shift();
+            if (oldestKey) {
+                this.exifCache.delete(oldestKey);
+            }
+        }
+    }
+    
+    /**
+     * Update cache order for LRU
+     */
+    private updateCacheOrder(key: string): void {
+        const index = this.cacheOrder.indexOf(key);
+        if (index !== -1) {
+            this.cacheOrder.splice(index, 1);
+            this.cacheOrder.push(key);
+        }
+    }
+    
+    /**
+     * Clear EXIF cache
+     */
+    clearCache(): void {
+        this.exifCache.clear();
+        this.cacheOrder = [];
+    }
+}
+
+export default ImageExifService.getInstance();

apps/client/src/services/image_sharing.ts

@@ -0,0 +1,681 @@
+/**
+ * Image Sharing and Export Module for Trilium Notes
+ * Provides functionality for sharing, downloading, and exporting images
+ */
+
+import server from './server.js';
+import utils from './utils.js';
+import toastService from './toast.js';
+import type FNote from '../entities/fnote.js';
+import { ImageValidator, withErrorBoundary, MemoryMonitor, ImageError, ImageErrorType } from './image_error_handler.js';
+
+/**
+ * Export format options
+ */
+export type ExportFormat = 'original' | 'jpeg' | 'png' | 'webp';
+
+/**
+ * Export size presets
+ */
+export type SizePreset = 'original' | 'thumbnail' | 'small' | 'medium' | 'large' | 'custom';
+
+/**
+ * Export configuration
+ */
+export interface ExportConfig {
+    format: ExportFormat;
+    quality: number; // 0-100 for JPEG/WebP
+    size: SizePreset;
+    customWidth?: number;
+    customHeight?: number;
+    maintainAspectRatio: boolean;
+    addWatermark: boolean;
+    watermarkText?: string;
+    watermarkPosition?: 'top-left' | 'top-right' | 'bottom-left' | 'bottom-right' | 'center';
+    watermarkOpacity?: number;
+}
+
+/**
+ * Share options
+ */
+export interface ShareOptions {
+    method: 'link' | 'email' | 'social';
+    expiresIn?: number; // Hours
+    password?: string;
+    allowDownload: boolean;
+    trackViews: boolean;
+}
+
+/**
+ * Share link data
+ */
+export interface ShareLink {
+    url: string;
+    shortUrl?: string;
+    expiresAt?: Date;
+    password?: string;
+    views: number;
+    maxViews?: number;
+    created: Date;
+}
+
+/**
+ * Size presets in pixels
+ */
+const SIZE_PRESETS = {
+    thumbnail: { width: 150, height: 150 },
+    small: { width: 400, height: 400 },
+    medium: { width: 800, height: 800 },
+    large: { width: 1600, height: 1600 }
+};
+
+/**
+ * ImageSharingService handles image sharing, downloading, and exporting
+ */
+class ImageSharingService {
+    private static instance: ImageSharingService;
+    private activeShares: Map<string, ShareLink> = new Map();
+    private downloadCanvas?: HTMLCanvasElement;
+    private downloadContext?: CanvasRenderingContext2D;
+    
+    // Canvas size limits for security and memory management
+    private readonly MAX_CANVAS_SIZE = 8192; // Maximum width/height
+    private readonly MAX_CANVAS_AREA = 50000000; // 50 megapixels
+
+    private defaultExportConfig: ExportConfig = {
+        format: 'original',
+        quality: 90,
+        size: 'original',
+        maintainAspectRatio: true,
+        addWatermark: false,
+        watermarkPosition: 'bottom-right',
+        watermarkOpacity: 0.5
+    };
+
+    private constructor() {
+        // Initialize download canvas
+        this.downloadCanvas = document.createElement('canvas');
+        this.downloadContext = this.downloadCanvas.getContext('2d') || undefined;
+    }
+
+    static getInstance(): ImageSharingService {
+        if (!ImageSharingService.instance) {
+            ImageSharingService.instance = new ImageSharingService();
+        }
+        return ImageSharingService.instance;
+    }
+
+    /**
+     * Download image with options
+     */
+    async downloadImage(
+        src: string,
+        filename: string,
+        config?: Partial<ExportConfig>
+    ): Promise<void> {
+        await withErrorBoundary(async () => {
+            // Validate inputs
+            ImageValidator.validateUrl(src);
+            const sanitizedFilename = ImageValidator.sanitizeFilename(filename);
+            const finalConfig = { ...this.defaultExportConfig, ...config };
+            
+            // Load image
+            const img = await this.loadImage(src);
+            
+            // Process image based on config
+            const processedBlob = await this.processImage(img, finalConfig);
+            
+            // Create download link
+            const url = URL.createObjectURL(processedBlob);
+            const link = document.createElement('a');
+            link.href = url;
+            
+            // Determine filename with extension
+            const extension = finalConfig.format === 'original' 
+                ? this.getOriginalExtension(sanitizedFilename) 
+                : finalConfig.format;
+            const finalFilename = this.ensureExtension(sanitizedFilename, extension);
+            
+            link.download = finalFilename;
+            document.body.appendChild(link);
+            link.click();
+            document.body.removeChild(link);
+            
+            // Cleanup
+            URL.revokeObjectURL(url);
+            
+            toastService.showMessage(`Downloaded ${finalFilename}`);
+        });
+    }
+
+    /**
+     * Process image according to export configuration
+     */
+    private async processImage(img: HTMLImageElement, config: ExportConfig): Promise<Blob> {
+        if (!this.downloadCanvas || !this.downloadContext) {
+            throw new Error('Canvas not initialized');
+        }
+
+        // Calculate dimensions
+        const { width, height } = this.calculateDimensions(
+            img.naturalWidth,
+            img.naturalHeight,
+            config
+        );
+
+        // Validate canvas dimensions
+        ImageValidator.validateDimensions(width, height);
+        
+        // Check memory availability
+        const estimatedMemory = MemoryMonitor.estimateImageMemory(width, height);
+        if (!MemoryMonitor.checkMemoryAvailable(estimatedMemory)) {
+            throw new ImageError(
+                ImageErrorType.MEMORY_ERROR,
+                'Insufficient memory to process image',
+                { width, height, estimatedMemory }
+            );
+        }
+        
+        // Set canvas size
+        this.downloadCanvas.width = width;
+        this.downloadCanvas.height = height;
+
+        // Clear canvas
+        this.downloadContext.fillStyle = 'white';
+        this.downloadContext.fillRect(0, 0, width, height);
+
+        // Draw image
+        this.downloadContext.drawImage(img, 0, 0, width, height);
+
+        // Add watermark if enabled
+        if (config.addWatermark && config.watermarkText) {
+            this.addWatermark(this.downloadContext, width, height, config);
+        }
+
+        // Convert to blob
+        return new Promise((resolve, reject) => {
+            const mimeType = this.getMimeType(config.format);
+            const quality = config.quality / 100;
+            
+            this.downloadCanvas!.toBlob(
+                (blob) => {
+                    if (blob) {
+                        resolve(blob);
+                    } else {
+                        reject(new Error('Failed to create blob'));
+                    }
+                },
+                mimeType,
+                quality
+            );
+        });
+    }
+
+    /**
+     * Calculate dimensions based on size preset
+     */
+    private calculateDimensions(
+        originalWidth: number,
+        originalHeight: number,
+        config: ExportConfig
+    ): { width: number; height: number } {
+        if (config.size === 'original') {
+            return { width: originalWidth, height: originalHeight };
+        }
+
+        if (config.size === 'custom' && config.customWidth && config.customHeight) {
+            if (config.maintainAspectRatio) {
+                const aspectRatio = originalWidth / originalHeight;
+                const targetRatio = config.customWidth / config.customHeight;
+                
+                if (aspectRatio > targetRatio) {
+                    return {
+                        width: config.customWidth,
+                        height: Math.round(config.customWidth / aspectRatio)
+                    };
+                } else {
+                    return {
+                        width: Math.round(config.customHeight * aspectRatio),
+                        height: config.customHeight
+                    };
+                }
+            }
+            return { width: config.customWidth, height: config.customHeight };
+        }
+
+        // Use preset
+        const preset = SIZE_PRESETS[config.size as keyof typeof SIZE_PRESETS];
+        if (!preset) {
+            return { width: originalWidth, height: originalHeight };
+        }
+
+        if (config.maintainAspectRatio) {
+            const aspectRatio = originalWidth / originalHeight;
+            const maxWidth = preset.width;
+            const maxHeight = preset.height;
+            
+            let width = originalWidth;
+            let height = originalHeight;
+            
+            if (width > maxWidth) {
+                width = maxWidth;
+                height = Math.round(width / aspectRatio);
+            }
+            
+            if (height > maxHeight) {
+                height = maxHeight;
+                width = Math.round(height * aspectRatio);
+            }
+            
+            return { width, height };
+        }
+
+        return preset;
+    }
+
+    /**
+     * Add watermark to canvas
+     */
+    private addWatermark(
+        ctx: CanvasRenderingContext2D,
+        width: number,
+        height: number,
+        config: ExportConfig
+    ): void {
+        if (!config.watermarkText) return;
+
+        ctx.save();
+        
+        // Set watermark style
+        ctx.globalAlpha = config.watermarkOpacity || 0.5;
+        ctx.fillStyle = 'white';
+        ctx.strokeStyle = 'black';
+        ctx.lineWidth = 2;
+        ctx.font = `${Math.min(width, height) * 0.05}px Arial`;
+        ctx.textAlign = 'center';
+        ctx.textBaseline = 'middle';
+
+        // Calculate position
+        let x = width / 2;
+        let y = height / 2;
+        
+        switch (config.watermarkPosition) {
+            case 'top-left':
+                x = width * 0.1;
+                y = height * 0.1;
+                ctx.textAlign = 'left';
+                break;
+            case 'top-right':
+                x = width * 0.9;
+                y = height * 0.1;
+                ctx.textAlign = 'right';
+                break;
+            case 'bottom-left':
+                x = width * 0.1;
+                y = height * 0.9;
+                ctx.textAlign = 'left';
+                break;
+            case 'bottom-right':
+                x = width * 0.9;
+                y = height * 0.9;
+                ctx.textAlign = 'right';
+                break;
+        }
+
+        // Draw watermark with outline
+        ctx.strokeText(config.watermarkText, x, y);
+        ctx.fillText(config.watermarkText, x, y);
+        
+        ctx.restore();
+    }
+
+    /**
+     * Generate shareable link for image
+     */
+    async generateShareLink(
+        noteId: string,
+        options?: Partial<ShareOptions>
+    ): Promise<ShareLink> {
+        try {
+            const finalOptions = {
+                method: 'link' as const,
+                allowDownload: true,
+                trackViews: false,
+                ...options
+            };
+
+            // Create share token on server
+            const response = await server.post(`notes/${noteId}/share`, {
+                type: 'image',
+                expiresIn: finalOptions.expiresIn,
+                password: finalOptions.password,
+                allowDownload: finalOptions.allowDownload,
+                trackViews: finalOptions.trackViews
+            });
+
+            const shareLink: ShareLink = {
+                url: `${window.location.origin}/share/${response.token}`,
+                shortUrl: response.shortUrl,
+                expiresAt: response.expiresAt ? new Date(response.expiresAt) : undefined,
+                password: finalOptions.password,
+                views: 0,
+                maxViews: response.maxViews,
+                created: new Date()
+            };
+
+            // Store in active shares
+            this.activeShares.set(response.token, shareLink);
+
+            return shareLink;
+        } catch (error) {
+            console.error('Failed to generate share link:', error);
+            throw error;
+        }
+    }
+
+    /**
+     * Copy image or link to clipboard
+     */
+    async copyToClipboard(
+        src: string,
+        type: 'image' | 'link' = 'link'
+    ): Promise<void> {
+        await withErrorBoundary(async () => {
+            // Validate URL
+            ImageValidator.validateUrl(src);
+            if (type === 'link') {
+                // Copy URL to clipboard
+                await navigator.clipboard.writeText(src);
+                toastService.showMessage('Link copied to clipboard');
+            } else {
+                // Copy image data to clipboard
+                const img = await this.loadImage(src);
+                
+                if (!this.downloadCanvas || !this.downloadContext) {
+                    throw new Error('Canvas not initialized');
+                }
+                
+                // Validate dimensions before setting
+                ImageValidator.validateDimensions(img.naturalWidth, img.naturalHeight);
+                
+                this.downloadCanvas.width = img.naturalWidth;
+                this.downloadCanvas.height = img.naturalHeight;
+                this.downloadContext.drawImage(img, 0, 0);
+                
+                this.downloadCanvas.toBlob(async (blob) => {
+                    if (blob) {
+                        try {
+                            const item = new ClipboardItem({ 'image/png': blob });
+                            await navigator.clipboard.write([item]);
+                            toastService.showMessage('Image copied to clipboard');
+                        } catch (error) {
+                            console.error('Failed to copy image to clipboard:', error);
+                            // Fallback to copying link
+                            await navigator.clipboard.writeText(src);
+                            toastService.showMessage('Image link copied to clipboard');
+                        }
+                    }
+                });
+            }
+        });
+    }
+
+    /**
+     * Share via native share API (mobile)
+     */
+    async shareNative(
+        src: string,
+        title: string,
+        text?: string
+    ): Promise<void> {
+        if (!navigator.share) {
+            throw new Error('Native share not supported');
+        }
+
+        try {
+            // Try to share with file
+            const img = await this.loadImage(src);
+            const blob = await this.processImage(img, this.defaultExportConfig);
+            const file = new File([blob], `${title}.${this.defaultExportConfig.format}`, {
+                type: this.getMimeType(this.defaultExportConfig.format)
+            });
+
+            await navigator.share({
+                title,
+                text: text || `Check out this image: ${title}`,
+                files: [file]
+            });
+        } catch (error) {
+            // Fallback to sharing URL
+            try {
+                await navigator.share({
+                    title,
+                    text: text || `Check out this image: ${title}`,
+                    url: src
+                });
+            } catch (shareError) {
+                console.error('Failed to share:', shareError);
+                throw shareError;
+            }
+        }
+    }
+
+    /**
+     * Export multiple images as ZIP
+     */
+    async exportBatch(
+        images: Array<{ src: string; filename: string }>,
+        config?: Partial<ExportConfig>
+    ): Promise<void> {
+        try {
+            // Dynamic import of JSZip
+            const JSZip = (await import('jszip')).default;
+            const zip = new JSZip();
+            
+            const finalConfig = { ...this.defaultExportConfig, ...config };
+            
+            // Process each image
+            for (const { src, filename } of images) {
+                try {
+                    const img = await this.loadImage(src);
+                    const blob = await this.processImage(img, finalConfig);
+                    const extension = finalConfig.format === 'original' 
+                        ? this.getOriginalExtension(filename) 
+                        : finalConfig.format;
+                    const finalFilename = this.ensureExtension(filename, extension);
+                    
+                    zip.file(finalFilename, blob);
+                } catch (error) {
+                    console.error(`Failed to process image ${filename}:`, error);
+                }
+            }
+            
+            // Generate and download ZIP
+            const zipBlob = await zip.generateAsync({ type: 'blob' });
+            const url = URL.createObjectURL(zipBlob);
+            const link = document.createElement('a');
+            link.href = url;
+            link.download = `images_${Date.now()}.zip`;
+            document.body.appendChild(link);
+            link.click();
+            document.body.removeChild(link);
+            URL.revokeObjectURL(url);
+            
+            toastService.showMessage(`Exported ${images.length} images`);
+        } catch (error) {
+            console.error('Failed to export images:', error);
+            toastService.showError('Failed to export images');
+            throw error;
+        }
+    }
+
+    /**
+     * Open share dialog
+     */
+    openShareDialog(
+        src: string,
+        title: string,
+        noteId?: string
+    ): void {
+        // Create modal dialog
+        const dialog = document.createElement('div');
+        dialog.className = 'share-dialog-overlay';
+        dialog.style.cssText = `
+            position: fixed;
+            top: 0;
+            left: 0;
+            right: 0;
+            bottom: 0;
+            background: rgba(0, 0, 0, 0.5);
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            z-index: 10000;
+        `;
+
+        const content = document.createElement('div');
+        content.className = 'share-dialog';
+        content.style.cssText = `
+            background: white;
+            border-radius: 8px;
+            padding: 20px;
+            width: 400px;
+            max-width: 90%;
+        `;
+
+        content.innerHTML = `
+            <h3 style="margin: 0 0 15px 0;">Share Image</h3>
+            <div class="share-options" style="display: flex; flex-direction: column; gap: 10px;">
+                <button class="share-copy-link" style="padding: 10px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;">
+                    <i class="bx bx-link"></i> Copy Link
+                </button>
+                <button class="share-copy-image" style="padding: 10px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;">
+                    <i class="bx bx-copy"></i> Copy Image
+                </button>
+                <button class="share-download" style="padding: 10px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;">
+                    <i class="bx bx-download"></i> Download
+                </button>
+                ${navigator.share ? `
+                    <button class="share-native" style="padding: 10px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;">
+                        <i class="bx bx-share"></i> Share...
+                    </button>
+                ` : ''}
+                ${noteId ? `
+                    <button class="share-generate-link" style="padding: 10px; border: 1px solid #ddd; border-radius: 4px; cursor: pointer;">
+                        <i class="bx bx-link-external"></i> Generate Share Link
+                    </button>
+                ` : ''}
+            </div>
+            <button class="close-dialog" style="margin-top: 15px; padding: 8px 16px; background: #f0f0f0; border: none; border-radius: 4px; cursor: pointer;">
+                Close
+            </button>
+        `;
+
+        // Add event handlers
+        content.querySelector('.share-copy-link')?.addEventListener('click', () => {
+            this.copyToClipboard(src, 'link');
+            dialog.remove();
+        });
+
+        content.querySelector('.share-copy-image')?.addEventListener('click', () => {
+            this.copyToClipboard(src, 'image');
+            dialog.remove();
+        });
+
+        content.querySelector('.share-download')?.addEventListener('click', () => {
+            this.downloadImage(src, title);
+            dialog.remove();
+        });
+
+        content.querySelector('.share-native')?.addEventListener('click', () => {
+            this.shareNative(src, title);
+            dialog.remove();
+        });
+
+        content.querySelector('.share-generate-link')?.addEventListener('click', async () => {
+            if (noteId) {
+                const link = await this.generateShareLink(noteId);
+                await this.copyToClipboard(link.url, 'link');
+                dialog.remove();
+            }
+        });
+
+        content.querySelector('.close-dialog')?.addEventListener('click', () => {
+            dialog.remove();
+        });
+
+        dialog.appendChild(content);
+        document.body.appendChild(dialog);
+    }
+
+    /**
+     * Load image from URL
+     */
+    private loadImage(src: string): Promise<HTMLImageElement> {
+        return new Promise((resolve, reject) => {
+            const img = new Image();
+            img.crossOrigin = 'anonymous';
+            img.onload = () => resolve(img);
+            img.onerror = () => reject(new Error(`Failed to load image: ${src}`));
+            img.src = src;
+        });
+    }
+
+    /**
+     * Get MIME type for format
+     */
+    private getMimeType(format: ExportFormat): string {
+        switch (format) {
+            case 'jpeg':
+                return 'image/jpeg';
+            case 'png':
+                return 'image/png';
+            case 'webp':
+                return 'image/webp';
+            default:
+                return 'image/png';
+        }
+    }
+
+    /**
+     * Get original extension from filename
+     */
+    private getOriginalExtension(filename: string): string {
+        const parts = filename.split('.');
+        if (parts.length > 1) {
+            return parts[parts.length - 1].toLowerCase();
+        }
+        return 'png';
+    }
+
+    /**
+     * Ensure filename has correct extension
+     */
+    private ensureExtension(filename: string, extension: string): string {
+        const parts = filename.split('.');
+        if (parts.length > 1) {
+            parts[parts.length - 1] = extension;
+            return parts.join('.');
+        }
+        return `${filename}.${extension}`;
+    }
+
+    /**
+     * Cleanup resources
+     */
+    cleanup(): void {
+        this.activeShares.clear();
+        
+        // Clean up canvas memory
+        if (this.downloadCanvas && this.downloadContext) {
+            this.downloadContext.clearRect(0, 0, this.downloadCanvas.width, this.downloadCanvas.height);
+            this.downloadCanvas.width = 0;
+            this.downloadCanvas.height = 0;
+        }
+        
+        this.downloadCanvas = undefined;
+        this.downloadContext = undefined;
+    }
+}
+
+export default ImageSharingService.getInstance();

apps/client/src/services/media_viewer.ts

@@ -0,0 +1,552 @@
+import PhotoSwipe from 'photoswipe';
+import type PhotoSwipeOptions from 'photoswipe';
+import type { DataSource, SlideData } from 'photoswipe';
+import 'photoswipe/style.css';
+import '../styles/photoswipe-mobile-a11y.css';
+import mobileA11yService, { type MobileA11yConfig } from './photoswipe_mobile_a11y.js';
+
+// Define Content type locally since it's not exported by PhotoSwipe
+interface Content {
+    width?: number;
+    height?: number;
+    [key: string]: any;
+}
+
+// Define AugmentedEvent type locally
+interface AugmentedEvent<T extends string> {
+    content: Content;
+    slide?: any;
+    preventDefault?: () => void;
+    [key: string]: any;
+}
+
+/**
+ * Media item interface for PhotoSwipe gallery
+ */
+export interface MediaItem {
+    src: string;
+    width?: number;
+    height?: number;
+    alt?: string;
+    title?: string;
+    noteId?: string;
+    element?: HTMLElement;
+    msrc?: string; // Thumbnail source
+}
+
+/**
+ * Configuration options for the media viewer
+ */
+export interface MediaViewerConfig {
+    bgOpacity?: number;
+    showHideOpacity?: boolean;
+    showAnimationDuration?: number;
+    hideAnimationDuration?: number;
+    allowPanToNext?: boolean;
+    spacing?: number;
+    maxSpreadZoom?: number;
+    getThumbBoundsFn?: (index: number) => { x: number; y: number; w: number } | undefined;
+    pinchToClose?: boolean;
+    closeOnScroll?: boolean;
+    closeOnVerticalDrag?: boolean;
+    mouseMovePan?: boolean;
+    arrowKeys?: boolean;
+    returnFocus?: boolean;
+    escKey?: boolean;
+    errorMsg?: string;
+    preloadFirstSlide?: boolean;
+    preload?: [number, number];
+    loop?: boolean;
+    wheelToZoom?: boolean;
+    mobileA11y?: MobileA11yConfig; // Mobile and accessibility configuration
+}
+
+/**
+ * Event callbacks for media viewer
+ */
+export interface MediaViewerCallbacks {
+    onOpen?: () => void;
+    onClose?: () => void;
+    onChange?: (index: number) => void;
+    onImageLoad?: (index: number, item: MediaItem) => void;
+    onImageError?: (index: number, item: MediaItem, error?: Error) => void;
+}
+
+/**
+ * PhotoSwipe data item with original item reference
+ */
+interface PhotoSwipeDataItem extends SlideData {
+    _originalItem?: MediaItem;
+}
+
+/**
+ * Error handler for media viewer operations
+ */
+class MediaViewerError extends Error {
+    constructor(message: string, public readonly cause?: unknown) {
+        super(message);
+        this.name = 'MediaViewerError';
+    }
+}
+
+/**
+ * MediaViewerService manages the PhotoSwipe lightbox for viewing images and media
+ * in Trilium Notes. Implements singleton pattern for global access.
+ */
+class MediaViewerService {
+    private static instance: MediaViewerService;
+    private photoSwipe: PhotoSwipe | null = null;
+    private defaultConfig: MediaViewerConfig;
+    private currentItems: MediaItem[] = [];
+    private callbacks: MediaViewerCallbacks = {};
+    private cleanupHandlers: Array<() => void> = [];
+
+    private constructor() {
+        // Default configuration optimized for Trilium
+        this.defaultConfig = {
+            bgOpacity: 0.95,
+            showHideOpacity: true,
+            showAnimationDuration: 250,
+            hideAnimationDuration: 250,
+            allowPanToNext: true,
+            spacing: 0.12,
+            maxSpreadZoom: 4,
+            pinchToClose: true,
+            closeOnScroll: false,
+            closeOnVerticalDrag: true,
+            mouseMovePan: true,
+            arrowKeys: true,
+            returnFocus: true,
+            escKey: true,
+            errorMsg: 'The image could not be loaded',
+            preloadFirstSlide: true,
+            preload: [1, 2],
+            loop: true,
+            wheelToZoom: true
+        };
+
+        // Setup global cleanup on window unload
+        window.addEventListener('beforeunload', () => this.destroy());
+    }
+
+    /**
+     * Get singleton instance of MediaViewerService
+     */
+    static getInstance(): MediaViewerService {
+        if (!MediaViewerService.instance) {
+            MediaViewerService.instance = new MediaViewerService();
+        }
+        return MediaViewerService.instance;
+    }
+
+    /**
+     * Open the media viewer with specified items
+     */
+    open(items: MediaItem[], startIndex: number = 0, config?: Partial<MediaViewerConfig>, callbacks?: MediaViewerCallbacks): void {
+        try {
+            // Validate inputs
+            if (!items || items.length === 0) {
+                throw new MediaViewerError('No items provided to media viewer');
+            }
+            
+            if (startIndex < 0 || startIndex >= items.length) {
+                console.warn(`Invalid start index ${startIndex}, using 0`);
+                startIndex = 0;
+            }
+
+            // Close any existing viewer
+            this.close();
+
+            this.currentItems = items;
+            this.callbacks = callbacks || {};
+
+            // Prepare data source for PhotoSwipe with error handling
+            const dataSource: DataSource = items.map((item, index) => {
+                try {
+                    return this.prepareItem(item);
+                } catch (error) {
+                    console.error(`Failed to prepare item at index ${index}:`, error);
+                    // Return a minimal valid item as fallback
+                    return {
+                        src: item.src,
+                        width: 800,
+                        height: 600,
+                        alt: item.alt || 'Error loading image'
+                    } as PhotoSwipeDataItem;
+                }
+            });
+
+            // Merge configurations
+            const finalConfig = {
+                ...this.defaultConfig,
+                ...config,
+                dataSource,
+                index: startIndex,
+                errorMsg: config?.errorMsg || 'The image could not be loaded. Please try again.'
+            };
+
+            // Create and initialize PhotoSwipe
+            this.photoSwipe = new PhotoSwipe(finalConfig);
+
+            // Setup event handlers
+            this.setupEventHandlers();
+            
+            // Apply mobile and accessibility enhancements
+            if (config?.mobileA11y || this.shouldAutoEnhance()) {
+                mobileA11yService.enhancePhotoSwipe(this.photoSwipe, config?.mobileA11y);
+            }
+
+            // Initialize the viewer
+            this.photoSwipe.init();
+        } catch (error) {
+            console.error('Failed to open media viewer:', error);
+            // Cleanup on error
+            this.close();
+            // Re-throw as MediaViewerError
+            throw error instanceof MediaViewerError ? error : new MediaViewerError('Failed to open media viewer', error);
+        }
+    }
+
+    /**
+     * Open a single image in the viewer
+     */
+    openSingle(item: MediaItem, config?: Partial<MediaViewerConfig>, callbacks?: MediaViewerCallbacks): void {
+        this.open([item], 0, config, callbacks);
+    }
+
+    /**
+     * Close the media viewer
+     */
+    close(): void {
+        if (this.photoSwipe) {
+            this.photoSwipe.destroy();
+            this.photoSwipe = null;
+            this.cleanupEventHandlers();
+        }
+    }
+
+    /**
+     * Navigate to next item
+     */
+    next(): void {
+        if (this.photoSwipe) {
+            this.photoSwipe.next();
+        }
+    }
+
+    /**
+     * Navigate to previous item
+     */
+    prev(): void {
+        if (this.photoSwipe) {
+            this.photoSwipe.prev();
+        }
+    }
+
+    /**
+     * Go to specific slide by index
+     */
+    goTo(index: number): void {
+        if (this.photoSwipe && index >= 0 && index < this.currentItems.length) {
+            this.photoSwipe.goTo(index);
+        }
+    }
+
+    /**
+     * Get current slide index
+     */
+    getCurrentIndex(): number {
+        return this.photoSwipe ? this.photoSwipe.currIndex : -1;
+    }
+
+    /**
+     * Check if viewer is open
+     */
+    isOpen(): boolean {
+        return this.photoSwipe !== null;
+    }
+
+    /**
+     * Update configuration dynamically
+     */
+    updateConfig(config: Partial<MediaViewerConfig>): void {
+        this.defaultConfig = {
+            ...this.defaultConfig,
+            ...config
+        };
+    }
+
+    /**
+     * Prepare item for PhotoSwipe
+     */
+    private prepareItem(item: MediaItem): PhotoSwipeDataItem {
+        const prepared: PhotoSwipeDataItem = {
+            src: item.src,
+            alt: item.alt || '',
+            title: item.title
+        };
+
+        // If dimensions are provided, use them
+        if (item.width && item.height) {
+            prepared.width = item.width;
+            prepared.height = item.height;
+        } else {
+            // Default dimensions - will be updated when image loads
+            prepared.width = 0;
+            prepared.height = 0;
+        }
+
+        // Add thumbnail if provided
+        if (item.msrc) {
+            prepared.msrc = item.msrc;
+        }
+
+        // Store original item reference
+        prepared._originalItem = item;
+
+        return prepared;
+    }
+
+    /**
+     * Setup event handlers for PhotoSwipe
+     */
+    private setupEventHandlers(): void {
+        if (!this.photoSwipe) return;
+
+        // Opening event
+        const openHandler = () => {
+            if (this.callbacks.onOpen) {
+                this.callbacks.onOpen();
+            }
+        };
+        this.photoSwipe.on('openingAnimationEnd', openHandler);
+        this.cleanupHandlers.push(() => this.photoSwipe?.off('openingAnimationEnd', openHandler));
+
+        // Closing event
+        const closeHandler = () => {
+            if (this.callbacks.onClose) {
+                this.callbacks.onClose();
+            }
+        };
+        this.photoSwipe.on('close', closeHandler);
+        this.cleanupHandlers.push(() => this.photoSwipe?.off('close', closeHandler));
+
+        // Change event
+        const changeHandler = () => {
+            if (this.callbacks.onChange && this.photoSwipe) {
+                this.callbacks.onChange(this.photoSwipe.currIndex);
+            }
+        };
+        this.photoSwipe.on('change', changeHandler);
+        this.cleanupHandlers.push(() => this.photoSwipe?.off('change', changeHandler));
+
+        // Image load event - also update dimensions if needed
+        const loadCompleteHandler = (e: any) => {
+            try {
+                const { content } = e;
+                const extContent = content as Content & { type?: string; data?: HTMLImageElement; index?: number; _originalItem?: MediaItem };
+                
+                if (extContent.type === 'image' && extContent.data) {
+                    // Update dimensions if they were not provided
+                    if (content.width === 0 || content.height === 0) {
+                        const img = extContent.data;
+                        content.width = img.naturalWidth;
+                        content.height = img.naturalHeight;
+                        if (typeof extContent.index === 'number') {
+                            this.photoSwipe?.refreshSlideContent(extContent.index);
+                        }
+                    }
+
+                    if (this.callbacks.onImageLoad && typeof extContent.index === 'number' && extContent._originalItem) {
+                        this.callbacks.onImageLoad(extContent.index, extContent._originalItem);
+                    }
+                }
+            } catch (error) {
+                console.error('Error in loadComplete handler:', error);
+            }
+        };
+        this.photoSwipe.on('loadComplete', loadCompleteHandler);
+        this.cleanupHandlers.push(() => this.photoSwipe?.off('loadComplete', loadCompleteHandler));
+
+        // Image error event
+        const errorHandler = (e: any) => {
+            try {
+                const { content } = e;
+                const extContent = content as Content & { index?: number; _originalItem?: MediaItem };
+                
+                if (this.callbacks.onImageError && typeof extContent.index === 'number' && extContent._originalItem) {
+                    const error = new MediaViewerError(`Failed to load image at index ${extContent.index}`);
+                    this.callbacks.onImageError(extContent.index, extContent._originalItem, error);
+                }
+            } catch (error) {
+                console.error('Error in errorHandler:', error);
+            }
+        };
+        this.photoSwipe.on('loadError', errorHandler);
+        this.cleanupHandlers.push(() => this.photoSwipe?.off('loadError', errorHandler));
+    }
+
+    /**
+     * Cleanup event handlers
+     */
+    private cleanupEventHandlers(): void {
+        this.cleanupHandlers.forEach(handler => handler());
+        this.cleanupHandlers = [];
+    }
+
+    /**
+     * Destroy the service and cleanup resources
+     */
+    destroy(): void {
+        this.close();
+        this.currentItems = [];
+        this.callbacks = {};
+        
+        // Cleanup mobile and accessibility enhancements
+        mobileA11yService.cleanup();
+    }
+
+    /**
+     * Get dimensions from image element or URL with proper resource cleanup
+     */
+    async getImageDimensions(src: string): Promise<{ width: number; height: number }> {
+        return new Promise((resolve, reject) => {
+            const img = new Image();
+            let resolved = false;
+            
+            const cleanup = () => {
+                img.onload = null;
+                img.onerror = null;
+                // Clear the src to help with garbage collection
+                if (!resolved) {
+                    img.src = '';
+                }
+            };
+            
+            img.onload = () => {
+                resolved = true;
+                const dimensions = {
+                    width: img.naturalWidth,
+                    height: img.naturalHeight
+                };
+                cleanup();
+                resolve(dimensions);
+            };
+            
+            img.onerror = () => {
+                const error = new MediaViewerError(`Failed to load image: ${src}`);
+                cleanup();
+                reject(error);
+            };
+            
+            // Set a timeout for image loading
+            const timeoutId = setTimeout(() => {
+                if (!resolved) {
+                    cleanup();
+                    reject(new MediaViewerError(`Image loading timeout: ${src}`));
+                }
+            }, 30000); // 30 second timeout
+            
+            img.src = src;
+            
+            // Clear timeout on success or error
+            // Store the original handlers with timeout cleanup
+            const originalOnload = img.onload;
+            const originalOnerror = img.onerror;
+            
+            img.onload = function(ev: Event) {
+                clearTimeout(timeoutId);
+                if (originalOnload) {
+                    originalOnload.call(img, ev);
+                }
+            };
+            
+            img.onerror = function(ev: Event | string) {
+                clearTimeout(timeoutId);
+                if (originalOnerror) {
+                    originalOnerror.call(img, ev);
+                }
+            };
+        });
+    }
+
+    /**
+     * Create items from image elements in a container with error isolation
+     */
+    async createItemsFromContainer(container: HTMLElement, selector: string = 'img'): Promise<MediaItem[]> {
+        const images = container.querySelectorAll<HTMLImageElement>(selector);
+        const items: MediaItem[] = [];
+
+        // Process each image with isolated error handling
+        const promises = Array.from(images).map(async (img) => {
+            try {
+                const item: MediaItem = {
+                    src: img.src,
+                    alt: img.alt || `Image ${items.length + 1}`,
+                    title: img.title || img.alt || `Image ${items.length + 1}`,
+                    element: img,
+                    width: img.naturalWidth || undefined,
+                    height: img.naturalHeight || undefined
+                };
+
+                // Try to get dimensions if not available
+                if (!item.width || !item.height) {
+                    try {
+                        const dimensions = await this.getImageDimensions(img.src);
+                        item.width = dimensions.width;
+                        item.height = dimensions.height;
+                    } catch (error) {
+                        // Log but don't fail - image will still be viewable
+                        console.warn(`Failed to get dimensions for image: ${img.src}`, error);
+                        // Set default dimensions as fallback
+                        item.width = 800;
+                        item.height = 600;
+                    }
+                }
+
+                return item;
+            } catch (error) {
+                // Log error but continue processing other images
+                console.error(`Failed to process image: ${img.src}`, error);
+                return null;
+            }
+        });
+
+        // Wait for all promises and filter out nulls
+        const results = await Promise.allSettled(promises);
+        for (const result of results) {
+            if (result.status === 'fulfilled' && result.value !== null) {
+                items.push(result.value);
+            }
+        }
+
+        return items;
+    }
+
+    /**
+     * Apply theme-specific styles
+     */
+    applyTheme(isDarkTheme: boolean): void {
+        // This will be expanded to modify PhotoSwipe's appearance based on Trilium's theme
+        const opacity = isDarkTheme ? 0.95 : 0.9;
+        this.updateConfig({ bgOpacity: opacity });
+    }
+    
+    /**
+     * Check if mobile/accessibility enhancements should be auto-enabled
+     */
+    private shouldAutoEnhance(): boolean {
+        // Auto-enable for touch devices
+        const isTouchDevice = 'ontouchstart' in window || 
+                             navigator.maxTouchPoints > 0;
+        
+        // Auto-enable if user has accessibility preferences
+        const prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
+        const prefersHighContrast = window.matchMedia('(prefers-contrast: high)').matches;
+        
+        return isTouchDevice || prefersReducedMotion || prefersHighContrast;
+    }
+}
+
+// Export singleton instance
+export default MediaViewerService.getInstance();

apps/client/src/services/photoswipe_mobile_a11y.spec.ts

@@ -0,0 +1,541 @@
+/**
+ * Tests for PhotoSwipe Mobile & Accessibility Enhancement Module
+ */
+
+import { describe, it, expect, beforeEach, afterEach, jest } from '@jest/globals';
+import type PhotoSwipe from 'photoswipe';
+import mobileA11yService from './photoswipe_mobile_a11y.js';
+
+// Mock PhotoSwipe
+const mockPhotoSwipe = {
+    template: document.createElement('div'),
+    currSlide: {
+        currZoomLevel: 1,
+        zoomTo: jest.fn(),
+        data: {
+            src: 'test.jpg',
+            alt: 'Test image',
+            title: 'Test',
+            width: 800,
+            height: 600
+        }
+    },
+    currIndex: 0,
+    viewportSize: { x: 800, y: 600 },
+    ui: { toggle: jest.fn() },
+    next: jest.fn(),
+    prev: jest.fn(),
+    goTo: jest.fn(),
+    close: jest.fn(),
+    getNumItems: () => 5,
+    on: jest.fn(),
+    off: jest.fn(),
+    options: {
+        showAnimationDuration: 250,
+        hideAnimationDuration: 250
+    }
+} as unknown as PhotoSwipe;
+
+describe('PhotoSwipeMobileA11yService', () => {
+    beforeEach(() => {
+        // Reset DOM
+        document.body.innerHTML = '';
+        
+        // Reset mocks
+        jest.clearAllMocks();
+    });
+    
+    afterEach(() => {
+        // Cleanup
+        mobileA11yService.cleanup();
+    });
+    
+    describe('Device Capabilities Detection', () => {
+        it('should detect touch device capabilities', () => {
+            // Add touch support to window
+            Object.defineProperty(window, 'ontouchstart', {
+                value: () => {},
+                writable: true
+            });
+            
+            // Service should detect touch support on initialization
+            const service = mobileA11yService;
+            expect(service).toBeDefined();
+        });
+        
+        it('should detect accessibility preferences', () => {
+            // Mock matchMedia for reduced motion
+            const mockMatchMedia = jest.fn().mockImplementation(query => ({
+                matches: query === '(prefers-reduced-motion: reduce)',
+                media: query,
+                addListener: jest.fn(),
+                removeListener: jest.fn()
+            }));
+            
+            Object.defineProperty(window, 'matchMedia', {
+                value: mockMatchMedia,
+                writable: true
+            });
+            
+            const service = mobileA11yService;
+            expect(service).toBeDefined();
+        });
+    });
+    
+    describe('ARIA Live Region', () => {
+        it('should create ARIA live region for announcements', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const liveRegion = document.querySelector('[aria-live]');
+            expect(liveRegion).toBeTruthy();
+            expect(liveRegion?.getAttribute('aria-live')).toBe('polite');
+            expect(liveRegion?.getAttribute('role')).toBe('status');
+        });
+        
+        it('should announce changes to screen readers', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe, {
+                a11y: {
+                    enableScreenReaderAnnouncements: true
+                }
+            });
+            
+            const liveRegion = document.querySelector('[aria-live]');
+            
+            // Trigger navigation
+            const changeHandler = (mockPhotoSwipe.on as jest.Mock).mock.calls
+                .find(call => call[0] === 'change')?.[1];
+            
+            if (changeHandler) {
+                changeHandler();
+                
+                // Check if announcement was made
+                expect(liveRegion?.textContent).toContain('Image 1 of 5');
+            }
+        });
+    });
+    
+    describe('Keyboard Navigation', () => {
+        it('should handle arrow key navigation', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            // Simulate arrow key presses
+            const leftArrow = new KeyboardEvent('keydown', { key: 'ArrowLeft' });
+            const rightArrow = new KeyboardEvent('keydown', { key: 'ArrowRight' });
+            
+            document.dispatchEvent(leftArrow);
+            expect(mockPhotoSwipe.prev).toHaveBeenCalled();
+            
+            document.dispatchEvent(rightArrow);
+            expect(mockPhotoSwipe.next).toHaveBeenCalled();
+        });
+        
+        it('should handle zoom with arrow keys', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const upArrow = new KeyboardEvent('keydown', { key: 'ArrowUp' });
+            const downArrow = new KeyboardEvent('keydown', { key: 'ArrowDown' });
+            
+            document.dispatchEvent(upArrow);
+            expect(mockPhotoSwipe.currSlide?.zoomTo).toHaveBeenCalledWith(
+                expect.any(Number),
+                expect.any(Object),
+                333
+            );
+            
+            document.dispatchEvent(downArrow);
+            expect(mockPhotoSwipe.currSlide?.zoomTo).toHaveBeenCalledTimes(2);
+        });
+        
+        it('should show keyboard help on ? key', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const helpKey = new KeyboardEvent('keydown', { key: '?' });
+            document.dispatchEvent(helpKey);
+            
+            const helpDialog = document.querySelector('.photoswipe-keyboard-help');
+            expect(helpDialog).toBeTruthy();
+            expect(helpDialog?.getAttribute('role')).toBe('dialog');
+        });
+        
+        it('should support quick navigation with number keys', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const key3 = new KeyboardEvent('keydown', { key: '3' });
+            document.dispatchEvent(key3);
+            
+            expect(mockPhotoSwipe.goTo).toHaveBeenCalledWith(2); // 0-indexed
+        });
+    });
+    
+    describe('Touch Gestures', () => {
+        it('should handle pinch to zoom', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            
+            // Simulate pinch gesture
+            const touch1 = { clientX: 100, clientY: 100, identifier: 0 };
+            const touch2 = { clientX: 200, clientY: 200, identifier: 1 };
+            
+            const touchStart = new TouchEvent('touchstart', {
+                touches: [touch1, touch2] as any
+            });
+            
+            element?.dispatchEvent(touchStart);
+            
+            // Move touches apart (zoom in)
+            const touch1Move = { clientX: 50, clientY: 50, identifier: 0 };
+            const touch2Move = { clientX: 250, clientY: 250, identifier: 1 };
+            
+            const touchMove = new TouchEvent('touchmove', {
+                touches: [touch1Move, touch2Move] as any
+            });
+            
+            element?.dispatchEvent(touchMove);
+            
+            // Zoom should be triggered
+            expect(mockPhotoSwipe.currSlide?.zoomTo).toHaveBeenCalled();
+        });
+        
+        it('should handle double tap to zoom', (done) => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            const pos = { clientX: 400, clientY: 300 };
+            
+            // First tap
+            const firstTap = new TouchEvent('touchend', {
+                changedTouches: [{ ...pos, identifier: 0 }] as any
+            });
+            
+            element?.dispatchEvent(new TouchEvent('touchstart', {
+                touches: [{ ...pos, identifier: 0 }] as any
+            }));
+            element?.dispatchEvent(firstTap);
+            
+            // Second tap within double tap delay
+            setTimeout(() => {
+                element?.dispatchEvent(new TouchEvent('touchstart', {
+                    touches: [{ ...pos, identifier: 0 }] as any
+                }));
+                
+                const secondTap = new TouchEvent('touchend', {
+                    changedTouches: [{ ...pos, identifier: 0 }] as any
+                });
+                element?.dispatchEvent(secondTap);
+                
+                // Check zoom was triggered
+                expect(mockPhotoSwipe.currSlide?.zoomTo).toHaveBeenCalled();
+                done();
+            }, 100);
+        });
+        
+        it('should detect swipe gestures', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            
+            // Simulate swipe left
+            const touchStart = new TouchEvent('touchstart', {
+                touches: [{ clientX: 300, clientY: 300, identifier: 0 }] as any
+            });
+            
+            const touchEnd = new TouchEvent('touchend', {
+                changedTouches: [{ clientX: 100, clientY: 300, identifier: 0 }] as any
+            });
+            
+            element?.dispatchEvent(touchStart);
+            element?.dispatchEvent(touchEnd);
+            
+            // Should navigate to next image
+            expect(mockPhotoSwipe.next).toHaveBeenCalled();
+        });
+    });
+    
+    describe('Focus Management', () => {
+        it('should trap focus within gallery', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            
+            // Add focusable elements
+            const button1 = document.createElement('button');
+            const button2 = document.createElement('button');
+            element?.appendChild(button1);
+            element?.appendChild(button2);
+            
+            // Focus first button
+            button1.focus();
+            
+            // Simulate Tab on last focusable element
+            const tabEvent = new KeyboardEvent('keydown', {
+                key: 'Tab',
+                shiftKey: false
+            });
+            
+            button2.focus();
+            element?.dispatchEvent(tabEvent);
+            
+            // Focus should wrap to first element
+            expect(document.activeElement).toBe(button1);
+        });
+        
+        it('should restore focus on close', () => {
+            const originalFocus = document.createElement('button');
+            document.body.appendChild(originalFocus);
+            originalFocus.focus();
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            // Trigger close handler
+            const closeHandler = (mockPhotoSwipe.on as jest.Mock).mock.calls
+                .find(call => call[0] === 'close')?.[1];
+            
+            if (closeHandler) {
+                closeHandler();
+                
+                // Focus should be restored
+                expect(document.activeElement).toBe(originalFocus);
+            }
+        });
+    });
+    
+    describe('ARIA Attributes', () => {
+        it('should add proper ARIA attributes to gallery', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            
+            expect(element?.getAttribute('role')).toBe('dialog');
+            expect(element?.getAttribute('aria-label')).toContain('Image gallery');
+            expect(element?.getAttribute('aria-modal')).toBe('true');
+        });
+        
+        it('should label controls for screen readers', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            
+            // Add mock controls
+            const prevBtn = document.createElement('button');
+            prevBtn.className = 'pswp__button--arrow--prev';
+            element?.appendChild(prevBtn);
+            
+            const nextBtn = document.createElement('button');
+            nextBtn.className = 'pswp__button--arrow--next';
+            element?.appendChild(nextBtn);
+            
+            // Enhance again to label the newly added controls
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            expect(prevBtn.getAttribute('aria-label')).toBe('Previous image');
+            expect(nextBtn.getAttribute('aria-label')).toBe('Next image');
+        });
+    });
+    
+    describe('Mobile UI Adaptations', () => {
+        it('should ensure minimum touch target size', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe, {
+                mobileUI: {
+                    minTouchTargetSize: 44
+                }
+            });
+            
+            const element = mockPhotoSwipe.template;
+            
+            // Add a button
+            const button = document.createElement('button');
+            button.className = 'pswp__button';
+            button.style.width = '30px';
+            button.style.height = '30px';
+            element?.appendChild(button);
+            
+            // Enhance to apply minimum sizes
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            // Button should be resized to meet minimum
+            expect(button.style.minWidth).toBe('44px');
+            expect(button.style.minHeight).toBe('44px');
+        });
+        
+        it('should add swipe indicators for mobile', () => {
+            // Mock as mobile device
+            Object.defineProperty(window, 'ontouchstart', {
+                value: () => {},
+                writable: true
+            });
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe, {
+                mobileUI: {
+                    swipeIndicators: true
+                }
+            });
+            
+            const indicators = document.querySelector('.photoswipe-swipe-indicators');
+            expect(indicators).toBeTruthy();
+        });
+    });
+    
+    describe('Performance Optimizations', () => {
+        it('should adapt quality based on device capabilities', () => {
+            // Mock low memory device
+            Object.defineProperty(navigator, 'deviceMemory', {
+                value: 1,
+                writable: true
+            });
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe, {
+                performance: {
+                    adaptiveQuality: true
+                }
+            });
+            
+            // Service should detect low memory and adjust settings
+            expect(mobileA11yService).toBeDefined();
+        });
+        
+        it('should apply reduced motion preferences', () => {
+            // Mock reduced motion preference
+            const mockMatchMedia = jest.fn().mockImplementation(query => ({
+                matches: query === '(prefers-reduced-motion: reduce)',
+                media: query,
+                addListener: jest.fn(),
+                removeListener: jest.fn()
+            }));
+            
+            Object.defineProperty(window, 'matchMedia', {
+                value: mockMatchMedia,
+                writable: true
+            });
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            // Animations should be disabled
+            expect(mockPhotoSwipe.options.showAnimationDuration).toBe(0);
+            expect(mockPhotoSwipe.options.hideAnimationDuration).toBe(0);
+        });
+        
+        it('should optimize for battery saving', () => {
+            // Mock battery API
+            const mockBattery = {
+                charging: false,
+                level: 0.15,
+                addEventListener: jest.fn()
+            };
+            
+            (navigator as any).getBattery = jest.fn().mockResolvedValue(mockBattery);
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe, {
+                performance: {
+                    batteryOptimization: true
+                }
+            });
+            
+            // Battery optimization should be enabled
+            expect((navigator as any).getBattery).toHaveBeenCalled();
+        });
+    });
+    
+    describe('High Contrast Mode', () => {
+        it('should apply high contrast styles when enabled', () => {
+            // Mock high contrast preference
+            const mockMatchMedia = jest.fn().mockImplementation(query => ({
+                matches: query === '(prefers-contrast: high)',
+                media: query,
+                addListener: jest.fn(),
+                removeListener: jest.fn()
+            }));
+            
+            Object.defineProperty(window, 'matchMedia', {
+                value: mockMatchMedia,
+                writable: true
+            });
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            const element = mockPhotoSwipe.template;
+            
+            // Should have high contrast styles
+            expect(element?.style.outline).toContain('2px solid white');
+        });
+    });
+    
+    describe('Haptic Feedback', () => {
+        it('should trigger haptic feedback on supported devices', () => {
+            // Mock vibration API
+            const mockVibrate = jest.fn();
+            Object.defineProperty(navigator, 'vibrate', {
+                value: mockVibrate,
+                writable: true
+            });
+            
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe, {
+                touch: {
+                    hapticFeedback: true
+                }
+            });
+            
+            // Trigger a gesture that should cause haptic feedback
+            const element = mockPhotoSwipe.template;
+            
+            // Double tap
+            const tap = new TouchEvent('touchend', {
+                changedTouches: [{ clientX: 100, clientY: 100, identifier: 0 }] as any
+            });
+            
+            element?.dispatchEvent(new TouchEvent('touchstart', {
+                touches: [{ clientX: 100, clientY: 100, identifier: 0 }] as any
+            }));
+            element?.dispatchEvent(tap);
+            
+            // Quick second tap
+            setTimeout(() => {
+                element?.dispatchEvent(new TouchEvent('touchstart', {
+                    touches: [{ clientX: 100, clientY: 100, identifier: 0 }] as any
+                }));
+                element?.dispatchEvent(tap);
+                
+                // Haptic feedback should be triggered
+                expect(mockVibrate).toHaveBeenCalled();
+            }, 50);
+        });
+    });
+    
+    describe('Configuration Updates', () => {
+        it('should update configuration dynamically', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            // Update configuration
+            mobileA11yService.updateConfig({
+                a11y: {
+                    ariaLiveRegion: 'assertive'
+                },
+                touch: {
+                    hapticFeedback: false
+                }
+            });
+            
+            const liveRegion = document.querySelector('[aria-live]');
+            expect(liveRegion?.getAttribute('aria-live')).toBe('assertive');
+        });
+    });
+    
+    describe('Cleanup', () => {
+        it('should properly cleanup resources', () => {
+            mobileA11yService.enhancePhotoSwipe(mockPhotoSwipe);
+            
+            // Create some elements
+            const liveRegion = document.querySelector('[aria-live]');
+            const helpDialog = document.querySelector('.photoswipe-keyboard-help');
+            
+            expect(liveRegion).toBeTruthy();
+            
+            // Cleanup
+            mobileA11yService.cleanup();
+            
+            // Elements should be removed
+            expect(document.querySelector('[aria-live]')).toBeFalsy();
+            expect(document.querySelector('.photoswipe-keyboard-help')).toBeFalsy();
+        });
+    });
+});

apps/client/src/styles/gallery.css

@@ -0,0 +1,284 @@
+/**
+ * Gallery styles for PhotoSwipe integration
+ * Provides styling for gallery UI elements
+ */
+
+/* Gallery thumbnail strip */
+.gallery-thumbnail-strip {
+    scrollbar-width: thin;
+    scrollbar-color: rgba(255, 255, 255, 0.3) transparent;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar {
+    height: 6px;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar-thumb {
+    background: rgba(255, 255, 255, 0.3);
+    border-radius: 3px;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar-thumb:hover {
+    background: rgba(255, 255, 255, 0.5);
+}
+
+.gallery-thumbnail {
+    position: relative;
+    overflow: hidden;
+}
+
+.gallery-thumbnail.active::after {
+    content: '';
+    position: absolute;
+    inset: 0;
+    background: rgba(255, 255, 255, 0.1);
+    pointer-events: none;
+}
+
+/* Gallery controls animations */
+.gallery-slideshow-controls button {
+    transition: transform 0.2s, background 0.2s;
+}
+
+.gallery-slideshow-controls button:hover {
+    transform: scale(1.1);
+    background: rgba(255, 255, 255, 1) !important;
+}
+
+.gallery-slideshow-controls button:active {
+    transform: scale(0.95);
+}
+
+/* Slideshow progress indicator */
+.slideshow-progress {
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    height: 3px;
+    background: rgba(255, 255, 255, 0.2);
+    z-index: 101;
+}
+
+.slideshow-progress-bar {
+    height: 100%;
+    background: rgba(255, 255, 255, 0.8);
+    width: 0;
+    transition: width linear;
+}
+
+.slideshow-progress.active .slideshow-progress-bar {
+    animation: slideshow-progress var(--slideshow-interval) linear;
+}
+
+@keyframes slideshow-progress {
+    from { width: 0; }
+    to { width: 100%; }
+}
+
+/* Gallery counter styling */
+.gallery-counter {
+    font-family: var(--font-family-monospace);
+    letter-spacing: 0.05em;
+    user-select: none;
+}
+
+.gallery-counter .current-index {
+    font-weight: bold;
+    color: #fff;
+}
+
+.gallery-counter .total-count {
+    opacity: 0.8;
+}
+
+/* Enhanced image hover effects */
+.pswp__img {
+    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.pswp__img.pswp__img--zoomed {
+    cursor: move;
+}
+
+/* Gallery navigation arrows */
+.pswp__button--arrow--left,
+.pswp__button--arrow--right {
+    background: rgba(0, 0, 0, 0.5) !important;
+    backdrop-filter: blur(10px);
+    border-radius: 50%;
+    width: 50px;
+    height: 50px;
+    margin: 20px;
+}
+
+.pswp__button--arrow--left:hover,
+.pswp__button--arrow--right:hover {
+    background: rgba(0, 0, 0, 0.7) !important;
+}
+
+/* Touch-friendly tap areas */
+@media (pointer: coarse) {
+    .gallery-thumbnail {
+        min-width: 60px;
+        min-height: 60px;
+    }
+    
+    .gallery-slideshow-controls button {
+        min-width: 50px;
+        min-height: 50px;
+    }
+}
+
+/* Smooth transitions */
+.pswp--animate_opacity {
+    transition: opacity 250ms cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+.pswp__bg {
+    transition: opacity 250ms cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+/* Loading state */
+.pswp__preloader {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+}
+
+.pswp__preloader__icn {
+    width: 30px;
+    height: 30px;
+    border: 3px solid rgba(255, 255, 255, 0.3);
+    border-top-color: #fff;
+    border-radius: 50%;
+    animation: gallery-spin 1s linear infinite;
+}
+
+@keyframes gallery-spin {
+    to { transform: rotate(360deg); }
+}
+
+/* Error state */
+.pswp__error-msg {
+    background: rgba(0, 0, 0, 0.8);
+    color: #ff6b6b;
+    padding: 20px;
+    border-radius: 8px;
+    max-width: 400px;
+    text-align: center;
+}
+
+/* Accessibility improvements */
+.pswp__button:focus-visible {
+    outline: 2px solid #4a9eff;
+    outline-offset: 2px;
+}
+
+.gallery-thumbnail:focus-visible {
+    outline: 2px solid #4a9eff;
+    outline-offset: -2px;
+}
+
+/* Dark theme adjustments */
+body.theme-dark .gallery-thumbnail-strip {
+    background: rgba(0, 0, 0, 0.8);
+}
+
+body.theme-dark .gallery-slideshow-controls button {
+    background: rgba(255, 255, 255, 0.8);
+    color: #000;
+}
+
+body.theme-dark .gallery-slideshow-controls button:hover {
+    background: rgba(255, 255, 255, 0.95);
+}
+
+/* Light theme adjustments */
+body.theme-light .pswp__bg {
+    background: rgba(255, 255, 255, 0.95);
+}
+
+body.theme-light .gallery-counter,
+body.theme-light .gallery-keyboard-hints {
+    background: rgba(0, 0, 0, 0.8);
+    color: white;
+}
+
+/* Mobile-specific styles */
+@media (max-width: 768px) {
+    .gallery-thumbnail-strip {
+        bottom: 40px;
+        padding: 6px;
+        gap: 4px;
+    }
+    
+    .gallery-thumbnail {
+        width: 50px !important;
+        height: 50px !important;
+    }
+    
+    .gallery-slideshow-controls {
+        top: 10px;
+        right: 10px;
+    }
+    
+    .gallery-counter {
+        font-size: 12px;
+        padding: 6px 10px;
+    }
+    
+    .pswp__button--arrow--left,
+    .pswp__button--arrow--right {
+        width: 40px;
+        height: 40px;
+        margin: 10px;
+    }
+}
+
+/* Tablet-specific styles */
+@media (min-width: 769px) and (max-width: 1024px) {
+    .gallery-thumbnail-strip {
+        max-width: 80%;
+    }
+    
+    .gallery-thumbnail {
+        width: 70px !important;
+        height: 70px !important;
+    }
+}
+
+/* High-DPI display optimizations */
+@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
+    .gallery-thumbnail img {
+        image-rendering: -webkit-optimize-contrast;
+        image-rendering: crisp-edges;
+    }
+}
+
+/* Reduced motion support */
+@media (prefers-reduced-motion: reduce) {
+    .gallery-thumbnail,
+    .gallery-slideshow-controls button,
+    .pswp__img,
+    .pswp--animate_opacity,
+    .pswp__bg {
+        transition: none !important;
+        animation: none !important;
+    }
+}
+
+/* Print styles */
+@media print {
+    .gallery-thumbnail-strip,
+    .gallery-slideshow-controls,
+    .gallery-counter,
+    .gallery-keyboard-hints {
+        display: none !important;
+    }
+}

apps/client/src/styles/photoswipe-mobile-a11y.css

@@ -0,0 +1,528 @@
+/**
+ * PhotoSwipe Mobile & Accessibility Styles
+ * Phase 6: Complete mobile optimization and WCAG 2.1 AA compliance
+ */
+
+/* ==========================================================================
+   Touch Target Optimization (WCAG 2.1 Success Criterion 2.5.5)
+   ========================================================================== */
+
+/* Ensure all interactive elements meet minimum 44x44px touch target */
+.pswp__button,
+.pswp__button--arrow--left,
+.pswp__button--arrow--right,
+.pswp__button--close,
+.pswp__button--zoom,
+.pswp__button--fs,
+.gallery-thumbnail,
+.photoswipe-bottom-sheet button {
+    min-width: 44px !important;
+    min-height: 44px !important;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+}
+
+/* Increase touch target padding on mobile */
+@media (pointer: coarse) {
+    .pswp__button {
+        padding: 12px;
+    }
+    
+    /* Larger hit areas for navigation arrows */
+    .pswp__button--arrow--left,
+    .pswp__button--arrow--right {
+        width: 60px !important;
+        height: 100px !important;
+    }
+}
+
+/* ==========================================================================
+   Focus Indicators (WCAG 2.1 Success Criterion 2.4.7)
+   ========================================================================== */
+
+/* High visibility focus indicators */
+.pswp__button:focus,
+.pswp__button:focus-visible,
+.gallery-thumbnail:focus,
+.photoswipe-bottom-sheet button:focus,
+.photoswipe-focused {
+    outline: 3px solid #4A90E2 !important;
+    outline-offset: 2px !important;
+    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.3);
+}
+
+/* Remove default browser outline */
+.pswp__button:focus:not(:focus-visible) {
+    outline: none;
+}
+
+/* Focus indicator for images */
+.pswp__img:focus {
+    outline: 3px solid #4A90E2;
+    outline-offset: -3px;
+}
+
+/* Skip link styles */
+.photoswipe-skip-link {
+    position: absolute;
+    left: -10000px;
+    top: 0;
+    background: #000;
+    color: #fff;
+    padding: 8px 16px;
+    text-decoration: none;
+    z-index: 100000;
+    border-radius: 4px;
+}
+
+.photoswipe-skip-link:focus {
+    left: 10px !important;
+    top: 10px !important;
+    width: auto !important;
+    height: auto !important;
+}
+
+/* ==========================================================================
+   Mobile UI Adaptations
+   ========================================================================== */
+
+/* Mobile-optimized toolbar */
+@media (max-width: 768px) {
+    .pswp__top-bar {
+        height: 60px;
+        background: rgba(0, 0, 0, 0.8);
+    }
+    
+    .pswp__button {
+        width: 50px;
+        height: 50px;
+    }
+    
+    /* Reposition counter for mobile */
+    .pswp__counter {
+        top: auto;
+        bottom: 70px;
+        left: 50%;
+        transform: translateX(-50%);
+        background: rgba(0, 0, 0, 0.7);
+        padding: 8px 16px;
+        border-radius: 20px;
+        font-size: 14px;
+    }
+}
+
+/* Bottom sheet for mobile controls */
+.photoswipe-bottom-sheet {
+    position: fixed;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    background: rgba(0, 0, 0, 0.95);
+    padding: env(safe-area-inset-bottom, 20px) 20px;
+    display: flex;
+    justify-content: space-around;
+    align-items: center;
+    z-index: 100;
+    transform: translateY(100%);
+    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
+    border-top: 1px solid rgba(255, 255, 255, 0.1);
+}
+
+.photoswipe-bottom-sheet.active {
+    transform: translateY(0);
+}
+
+.photoswipe-bottom-sheet button {
+    background: none;
+    border: 2px solid transparent;
+    color: white;
+    font-size: 24px;
+    padding: 10px;
+    border-radius: 50%;
+    transition: all 0.2s;
+}
+
+.photoswipe-bottom-sheet button:active {
+    background: rgba(255, 255, 255, 0.1);
+    transform: scale(0.95);
+}
+
+/* Swipe indicators */
+.photoswipe-swipe-indicators {
+    position: absolute;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    pointer-events: none;
+    animation: fadeInOut 3s ease-in-out;
+}
+
+@keyframes fadeInOut {
+    0%, 100% { opacity: 0; }
+    20%, 80% { opacity: 0.7; }
+}
+
+/* Gesture hints */
+.photoswipe-gesture-hints {
+    position: absolute;
+    top: 60px;
+    left: 50%;
+    transform: translateX(-50%);
+    background: rgba(0, 0, 0, 0.85);
+    color: white;
+    padding: 12px 24px;
+    border-radius: 24px;
+    font-size: 14px;
+    font-weight: 500;
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
+    pointer-events: none;
+}
+
+/* Context menu for long press */
+.photoswipe-context-menu {
+    background: var(--theme-background-color, white);
+    border: 1px solid var(--theme-border-color, #ccc);
+    border-radius: 8px;
+    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
+    overflow: hidden;
+    min-width: 200px;
+}
+
+.photoswipe-context-menu button {
+    display: block;
+    width: 100%;
+    padding: 12px 16px;
+    border: none;
+    background: none;
+    text-align: left;
+    cursor: pointer;
+    font-size: 16px;
+    transition: background 0.2s;
+}
+
+.photoswipe-context-menu button:hover,
+.photoswipe-context-menu button:focus {
+    background: var(--theme-hover-background, rgba(0, 0, 0, 0.05));
+}
+
+/* ==========================================================================
+   Responsive Breakpoints
+   ========================================================================== */
+
+/* Small phones (< 375px) */
+@media (max-width: 374px) {
+    .pswp__button {
+        width: 40px;
+        height: 40px;
+    }
+    
+    .gallery-thumbnail-strip {
+        padding: 5px !important;
+    }
+    
+    .gallery-thumbnail {
+        width: 60px !important;
+        height: 60px !important;
+    }
+}
+
+/* Tablets (768px - 1024px) */
+@media (min-width: 768px) and (max-width: 1024px) {
+    .pswp__button {
+        width: 48px;
+        height: 48px;
+    }
+    
+    .gallery-thumbnail {
+        width: 90px !important;
+        height: 90px !important;
+    }
+}
+
+/* Landscape orientation adjustments */
+@media (orientation: landscape) and (max-height: 500px) {
+    .pswp__top-bar {
+        height: 44px;
+    }
+    
+    .pswp__button {
+        width: 44px;
+        height: 44px;
+    }
+    
+    .gallery-thumbnail-strip {
+        bottom: 40px !important;
+        max-height: 60px;
+    }
+    
+    .gallery-thumbnail {
+        width: 50px !important;
+        height: 50px !important;
+    }
+}
+
+/* ==========================================================================
+   Accessibility Enhancements
+   ========================================================================== */
+
+/* Screen reader only content */
+.photoswipe-sr-only,
+.photoswipe-live-region,
+.photoswipe-aria-live {
+    position: absolute !important;
+    left: -10000px !important;
+    width: 1px !important;
+    height: 1px !important;
+    overflow: hidden !important;
+}
+
+/* Keyboard help dialog */
+.photoswipe-keyboard-help {
+    position: fixed;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    background: var(--theme-background-color, white);
+    color: var(--theme-text-color, black);
+    padding: 30px;
+    border-radius: 12px;
+    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
+    z-index: 10001;
+    max-width: 500px;
+    max-height: 80vh;
+    overflow-y: auto;
+}
+
+.photoswipe-keyboard-help h2 {
+    margin: 0 0 20px 0;
+    font-size: 20px;
+    font-weight: 600;
+}
+
+.photoswipe-keyboard-help dl {
+    margin: 0;
+    padding: 0;
+}
+
+.photoswipe-keyboard-help dt {
+    float: left;
+    clear: left;
+    width: 120px;
+    margin-bottom: 10px;
+}
+
+.photoswipe-keyboard-help dd {
+    margin-left: 140px;
+    margin-bottom: 10px;
+}
+
+.photoswipe-keyboard-help kbd {
+    display: inline-block;
+    padding: 3px 8px;
+    background: var(--theme-kbd-background, #f0f0f0);
+    border: 1px solid var(--theme-border-color, #ccc);
+    border-radius: 4px;
+    font-family: monospace;
+    font-size: 14px;
+    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.1);
+}
+
+.photoswipe-keyboard-help .close-help {
+    margin-top: 20px;
+    padding: 10px 20px;
+    background: var(--theme-primary-color, #4A90E2);
+    color: white;
+    border: none;
+    border-radius: 6px;
+    cursor: pointer;
+    font-size: 16px;
+    transition: background 0.2s;
+}
+
+.photoswipe-keyboard-help .close-help:hover,
+.photoswipe-keyboard-help .close-help:focus {
+    background: var(--theme-primary-hover, #357ABD);
+}
+
+/* ==========================================================================
+   High Contrast Mode Support
+   ========================================================================== */
+
+@media (prefers-contrast: high) {
+    .pswp__bg {
+        background: #000 !important;
+    }
+    
+    .pswp__button {
+        background: #000 !important;
+        border: 2px solid #fff !important;
+    }
+    
+    .pswp__button svg {
+        fill: #fff !important;
+    }
+    
+    .pswp__counter {
+        background: #000 !important;
+        color: #fff !important;
+        border: 2px solid #fff !important;
+    }
+    
+    .gallery-thumbnail {
+        border-width: 3px !important;
+    }
+    
+    .photoswipe-keyboard-help {
+        background: #000 !important;
+        color: #fff !important;
+        border: 2px solid #fff !important;
+    }
+    
+    .photoswipe-keyboard-help kbd {
+        background: #fff !important;
+        color: #000 !important;
+        border-color: #fff !important;
+    }
+}
+
+/* Windows High Contrast Mode */
+@media (-ms-high-contrast: active) {
+    .pswp__button {
+        border: 2px solid WindowText !important;
+    }
+    
+    .pswp__counter {
+        border: 2px solid WindowText !important;
+    }
+}
+
+/* ==========================================================================
+   Reduced Motion Support (WCAG 2.1 Success Criterion 2.3.3)
+   ========================================================================== */
+
+@media (prefers-reduced-motion: reduce) {
+    /* Disable all animations */
+    .pswp *,
+    .pswp *::before,
+    .pswp *::after {
+        animation-duration: 0.01ms !important;
+        animation-iteration-count: 1 !important;
+        transition-duration: 0.01ms !important;
+    }
+    
+    /* Remove slide transitions */
+    .pswp__container {
+        transition: none !important;
+    }
+    
+    /* Remove zoom animations */
+    .pswp__img {
+        transition: none !important;
+    }
+    
+    /* Instant show/hide for indicators */
+    .photoswipe-swipe-indicators,
+    .photoswipe-gesture-hints {
+        animation: none !important;
+        transition: none !important;
+    }
+}
+
+/* ==========================================================================
+   Performance Optimizations
+   ========================================================================== */
+
+/* GPU acceleration for smooth animations */
+.pswp__container,
+.pswp__img,
+.pswp__zoom-wrap {
+    will-change: transform;
+    transform: translateZ(0);
+}
+
+/* Optimize rendering for low-end devices */
+@media (max-width: 768px) and (max-resolution: 2dppx) {
+    .pswp__img {
+        image-rendering: -webkit-optimize-contrast;
+        image-rendering: crisp-edges;
+    }
+}
+
+/* Reduce visual complexity on low-end devices */
+.low-performance-mode .pswp__button {
+    box-shadow: none !important;
+}
+
+.low-performance-mode .gallery-thumbnail {
+    box-shadow: none !important;
+    transition: none !important;
+}
+
+/* ==========================================================================
+   Battery Optimization Mode
+   ========================================================================== */
+
+.battery-saver-mode .pswp__img {
+    filter: brightness(0.9);
+}
+
+.battery-saver-mode .pswp__button {
+    opacity: 0.8;
+}
+
+.battery-saver-mode .gallery-thumbnail-strip {
+    display: none;
+}
+
+/* ==========================================================================
+   Print Styles
+   ========================================================================== */
+
+@media print {
+    .pswp {
+        display: none !important;
+    }
+}
+
+/* ==========================================================================
+   Custom Scrollbar for Mobile
+   ========================================================================== */
+
+.gallery-thumbnail-strip::-webkit-scrollbar {
+    height: 4px;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar-track {
+    background: rgba(255, 255, 255, 0.1);
+    border-radius: 2px;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar-thumb {
+    background: rgba(255, 255, 255, 0.3);
+    border-radius: 2px;
+}
+
+.gallery-thumbnail-strip::-webkit-scrollbar-thumb:hover {
+    background: rgba(255, 255, 255, 0.5);
+}
+
+/* ==========================================================================
+   Safe Area Insets (for devices with notches)
+   ========================================================================== */
+
+.pswp__top-bar {
+    padding-top: env(safe-area-inset-top);
+}
+
+.photoswipe-bottom-sheet {
+    padding-bottom: env(safe-area-inset-bottom);
+}
+
+.pswp__button--arrow--left {
+    left: env(safe-area-inset-left, 10px);
+}
+
+.pswp__button--arrow--right {
+    right: env(safe-area-inset-right, 10px);
+}

apps/client/src/stylesheets/media-viewer.css

@@ -0,0 +1,253 @@
+/**
+ * Media Viewer Styles for Trilium Notes
+ * Customizes PhotoSwipe appearance to match Trilium's theme
+ */
+
+/* Base PhotoSwipe container customization */
+.pswp {
+    --pswp-bg: rgba(0, 0, 0, 0.95);
+    --pswp-placeholder-bg: rgba(30, 30, 30, 0.9);
+    --pswp-icon-color: #fff;
+    --pswp-icon-color-secondary: rgba(255, 255, 255, 0.75);
+    --pswp-icon-stroke-color: #fff;
+    --pswp-icon-stroke-width: 1px;
+    --pswp-error-text-color: #f44336;
+}
+
+/* Dark theme adjustments */
+body.theme-dark .pswp,
+body.theme-next-dark .pswp {
+    --pswp-bg: rgba(0, 0, 0, 0.95);
+    --pswp-placeholder-bg: rgba(30, 30, 30, 0.9);
+}
+
+/* Light theme adjustments */
+body.theme-light .pswp,
+body.theme-next-light .pswp {
+    --pswp-bg: rgba(0, 0, 0, 0.9);
+    --pswp-placeholder-bg: rgba(50, 50, 50, 0.8);
+}
+
+/* Toolbar and controls styling */
+.pswp__top-bar {
+    background-color: rgba(0, 0, 0, 0.5);
+    backdrop-filter: blur(10px);
+}
+
+.pswp__button {
+    transition: opacity 0.2s ease-in-out;
+}
+
+.pswp__button:hover {
+    opacity: 1;
+}
+
+/* Counter styling */
+.pswp__counter {
+    font-family: var(--main-font-family);
+    font-size: 14px;
+    color: rgba(255, 255, 255, 0.9);
+    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
+}
+
+/* Caption styling */
+.pswp__caption {
+    background-color: rgba(0, 0, 0, 0.7);
+    backdrop-filter: blur(10px);
+}
+
+.pswp__caption__center {
+    text-align: center;
+    font-family: var(--main-font-family);
+    font-size: 14px;
+    color: rgba(255, 255, 255, 0.9);
+    padding: 10px 20px;
+}
+
+/* Image styling */
+.pswp__img {
+    cursor: zoom-in;
+}
+
+.pswp__img--placeholder {
+    background-color: var(--pswp-placeholder-bg);
+}
+
+.pswp--zoomed-in .pswp__img {
+    cursor: grab;
+}
+
+.pswp--dragging .pswp__img {
+    cursor: grabbing;
+}
+
+/* Loading indicator */
+.pswp__preloader {
+    width: 44px;
+    height: 44px;
+}
+
+.pswp__preloader__icn {
+    width: 20px;
+    height: 20px;
+}
+
+/* Error message styling */
+.pswp__error-msg {
+    font-family: var(--main-font-family);
+    font-size: 14px;
+    color: var(--pswp-error-text-color);
+    text-align: center;
+    padding: 20px;
+}
+
+/* Thumbnails strip (for future implementation) */
+.pswp__thumbnails {
+    position: absolute;
+    bottom: 0;
+    left: 0;
+    right: 0;
+    height: 80px;
+    background-color: rgba(0, 0, 0, 0.7);
+    backdrop-filter: blur(10px);
+    display: flex;
+    align-items: center;
+    padding: 10px;
+    gap: 10px;
+    overflow-x: auto;
+    z-index: 1;
+}
+
+.pswp__thumbnail {
+    width: 60px;
+    height: 60px;
+    cursor: pointer;
+    opacity: 0.6;
+    transition: opacity 0.2s;
+    object-fit: cover;
+    border: 2px solid transparent;
+}
+
+.pswp__thumbnail:hover {
+    opacity: 0.9;
+}
+
+.pswp__thumbnail--active {
+    opacity: 1;
+    border-color: var(--main-border-color);
+}
+
+/* Animations */
+.pswp--open {
+    animation: pswpFadeIn 0.25s ease-out;
+}
+
+.pswp--closing {
+    animation: pswpFadeOut 0.25s ease-out;
+}
+
+@keyframes pswpFadeIn {
+    from {
+        opacity: 0;
+    }
+    to {
+        opacity: 1;
+    }
+}
+
+@keyframes pswpFadeOut {
+    from {
+        opacity: 1;
+    }
+    to {
+        opacity: 0;
+    }
+}
+
+/* Zoom animation */
+.pswp__zoom-wrap {
+    transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
+}
+
+/* Mobile-specific adjustments */
+@media (max-width: 768px) {
+    .pswp__caption__center {
+        font-size: 12px;
+        padding: 8px 16px;
+    }
+    
+    .pswp__counter {
+        font-size: 12px;
+    }
+    
+    .pswp__thumbnails {
+        height: 60px;
+    }
+    
+    .pswp__thumbnail {
+        width: 45px;
+        height: 45px;
+    }
+}
+
+/* Integration with Trilium's note context */
+.media-viewer-trigger {
+    cursor: zoom-in;
+    transition: opacity 0.2s;
+}
+
+.media-viewer-trigger:hover {
+    opacity: 0.9;
+}
+
+/* Gallery mode indicators */
+.media-viewer-gallery-indicator {
+    position: absolute;
+    top: 10px;
+    right: 10px;
+    background-color: rgba(0, 0, 0, 0.6);
+    color: white;
+    padding: 4px 8px;
+    border-radius: 4px;
+    font-size: 12px;
+    font-family: var(--main-font-family);
+    pointer-events: none;
+    z-index: 1;
+}
+
+/* Fullscreen mode adjustments */
+.pswp--fs {
+    background-color: black;
+}
+
+.pswp--fs .pswp__top-bar {
+    background-color: rgba(0, 0, 0, 0.7);
+}
+
+/* Accessibility improvements */
+.pswp__button:focus {
+    outline: 2px solid var(--main-border-color);
+    outline-offset: 2px;
+}
+
+.pswp__img:focus {
+    outline: none;
+}
+
+/* Custom toolbar buttons */
+.pswp__button--download {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2'%3E%3Cpath d='M21 15v4a2 2 0 0 1-2 2H5a2 2 0 0 1-2-2v-4'%3E%3C/path%3E%3Cpolyline points='7 10 12 15 17 10'%3E%3C/polyline%3E%3Cline x1='12' y1='15' x2='12' y2='3'%3E%3C/line%3E%3C/svg%3E");
+    background-size: 24px 24px;
+}
+
+.pswp__button--info {
+    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2'%3E%3Ccircle cx='12' cy='12' r='10'%3E%3C/circle%3E%3Cline x1='12' y1='16' x2='12' y2='12'%3E%3C/line%3E%3Cline x1='12' y1='8' x2='12.01' y2='8'%3E%3C/line%3E%3C/svg%3E");
+    background-size: 24px 24px;
+}
+
+/* Print styles */
+@media print {
+    .pswp {
+        display: none !important;
+    }
+}

apps/client/src/widgets/attachment_detail.ts

@@ -9,6 +9,9 @@ import contentRenderer from "../services/content_renderer.js";
 import toastService from "../services/toast.js";
 import type FAttachment from "../entities/fattachment.js";
 import type { EventData } from "../components/app_context.js";
+import appContext from "../components/app_context.js";
+import mediaViewer from "../services/media_viewer.js";
+import type { MediaItem } from "../services/media_viewer.js";
 
 const TPL = /*html*/`
 <div class="attachment-detail-widget">
@@ -65,6 +68,12 @@ const TPL = /*html*/`
 
         .attachment-content-wrapper img {
             margin: 10px;
+            cursor: zoom-in;
+            transition: opacity 0.2s;
+        }
+        
+        .attachment-content-wrapper img:hover {
+            opacity: 0.9;
         }
 
         .attachment-detail-wrapper.list-view .attachment-content-wrapper img, .attachment-detail-wrapper.list-view .attachment-content-wrapper video {
@@ -78,6 +87,24 @@ const TPL = /*html*/`
             object-fit: contain;
         }
         
+        .attachment-lightbox-hint {
+            position: absolute;
+            top: 10px;
+            right: 10px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 5px 10px;
+            border-radius: 4px;
+            font-size: 12px;
+            opacity: 0;
+            transition: opacity 0.3s;
+            pointer-events: none;
+        }
+        
+        .attachment-content-wrapper:hover .attachment-lightbox-hint {
+            opacity: 1;
+        }
+
         .attachment-detail-wrapper.scheduled-for-deletion .attachment-content-wrapper img {
             filter: contrast(10%);
         }
@@ -88,7 +115,9 @@ const TPL = /*html*/`
             <div class="attachment-actions-container"></div>
             <h4 class="attachment-title"></h4>
             <div class="attachment-details"></div>
-            <div style="flex: 1 1;"></div>
+            <button class="btn btn-sm back-to-note-btn" style="margin-left: auto;" title="Back to Note">
+                <span class="bx bx-arrow-back"></span> Back to Note
+            </button>
         </div>
 
         <div class="attachment-deletion-warning alert alert-info" style="margin-top: 15px;"></div>
@@ -125,6 +154,14 @@ export default class AttachmentDetailWidget extends BasicWidget {
         this.$wrapper = this.$widget.find(".attachment-detail-wrapper");
         this.$wrapper.addClass(this.isFullDetail ? "full-detail" : "list-view");
         
+        // Setup back to note button (only show in full detail mode)
+        if (this.isFullDetail) {
+            const $backBtn = this.$wrapper.find('.back-to-note-btn');
+            $backBtn.on('click', () => this.handleBackToNote());
+        } else {
+            this.$wrapper.find('.back-to-note-btn').hide();
+        }
+
         if (!this.isFullDetail) {
             const $link = await linkService.createLink(this.attachment.ownerId, {
                 title: this.attachment.title,
@@ -170,7 +207,92 @@ export default class AttachmentDetailWidget extends BasicWidget {
         this.$wrapper.find(".attachment-actions-container").append(this.attachmentActionsWidget.render());
 
         const { $renderedContent } = await contentRenderer.getRenderedContent(this.attachment, { imageHasZoom: this.isFullDetail });
-        this.$wrapper.find(".attachment-content-wrapper").append($renderedContent);
+        const $contentWrapper = this.$wrapper.find(".attachment-content-wrapper");
+        $contentWrapper.append($renderedContent);
+        
+        // Add PhotoSwipe integration for image attachments
+        if (this.attachment.role === 'image') {
+            this.setupPhotoSwipeIntegration($contentWrapper);
+        }
+    }
+
+    setupPhotoSwipeIntegration($contentWrapper: JQuery<HTMLElement>) {
+        // Add lightbox hint
+        const $hint = $('<div class="attachment-lightbox-hint">Click to view in lightbox</div>');
+        $contentWrapper.css('position', 'relative').append($hint);
+        
+        // Find the image element
+        const $img = $contentWrapper.find('img');
+        if (!$img.length) return;
+        
+        // Setup click handler for lightbox with namespace for proper cleanup
+        $img.off('click.photoswipe').on('click.photoswipe', (e) => {
+            e.preventDefault();
+            e.stopPropagation();
+            
+            const item: MediaItem = {
+                src: $img.attr('src') || '',
+                alt: this.attachment.title,
+                title: this.attachment.title,
+                noteId: this.attachment.ownerId,
+                element: $img[0] as HTMLElement
+            };
+            
+            // Try to get actual dimensions
+            const imgElement = $img[0] as HTMLImageElement;
+            if (imgElement.naturalWidth && imgElement.naturalHeight) {
+                item.width = imgElement.naturalWidth;
+                item.height = imgElement.naturalHeight;
+            }
+            
+            mediaViewer.openSingle(item, {
+                bgOpacity: 0.95,
+                showHideOpacity: true,
+                pinchToClose: true,
+                closeOnScroll: false,
+                closeOnVerticalDrag: true,
+                wheelToZoom: true,
+                getThumbBoundsFn: () => {
+                    // Get position for zoom animation
+                    const rect = imgElement.getBoundingClientRect();
+                    return {
+                        x: rect.left,
+                        y: rect.top,
+                        w: rect.width
+                    };
+                }
+            }, {
+                onOpen: () => {
+                    console.log('Attachment image opened in lightbox');
+                },
+                onClose: () => {
+                    // Check if we're in attachment detail view and reset viewScope if needed
+                    const activeContext = appContext.tabManager.getActiveContext();
+                    if (activeContext?.viewScope?.viewMode === 'attachments' && 
+                        activeContext?.viewScope?.attachmentId === this.attachment.attachmentId) {
+                        // Reset to normal note view when closing lightbox from attachment detail
+                        activeContext.setNote(this.attachment.ownerId, { 
+                            viewScope: { viewMode: 'default' } 
+                        });
+                    }
+                    // Restore focus to the image
+                    $img.focus();
+                }
+            });
+        });
+        
+        // Add keyboard support
+        $img.attr('tabindex', '0')
+            .attr('role', 'button')
+            .attr('aria-label', 'Click to view in lightbox');
+        
+        // Use namespaced event for proper cleanup
+        $img.off('keydown.photoswipe').on('keydown.photoswipe', (e) => {
+            if (e.key === 'Enter' || e.key === ' ') {
+                e.preventDefault();
+                $img.trigger('click');
+            }
+        });
     }
 
     async copyAttachmentLinkToClipboard() {
@@ -204,4 +326,43 @@ export default class AttachmentDetailWidget extends BasicWidget {
             }
         }
     }
+    
+    async handleBackToNote() {
+        try {
+            const activeContext = appContext.tabManager.getActiveContext();
+            if (!activeContext) {
+                console.warn('No active context available for navigation');
+                return;
+            }
+            
+            if (!this.attachment.ownerId) {
+                console.error('Cannot navigate back: no owner ID available');
+                return;
+            }
+            
+            await activeContext.setNote(this.attachment.ownerId, { 
+                viewScope: { viewMode: 'default' } 
+            });
+        } catch (error) {
+            console.error('Failed to navigate back to note:', error);
+            toastService.showError('Failed to navigate back to note');
+        }
+    }
+    
+    cleanup() {
+        // Remove all event handlers before cleanup
+        const $contentWrapper = this.$wrapper?.find('.attachment-content-wrapper');
+        if ($contentWrapper?.length) {
+            const $img = $contentWrapper.find('img');
+            if ($img.length) {
+                // Remove namespaced event handlers
+                $img.off('.photoswipe');
+            }
+        }
+        
+        // Remove back button handler
+        this.$wrapper?.find('.back-to-note-btn').off('click');
+        
+        super.cleanup();
+    }
 }

apps/client/src/widgets/embedded_image_gallery.ts

@@ -0,0 +1,549 @@
+/**
+ * Embedded Image Gallery Widget
+ * Handles image galleries within text notes and other content types
+ */
+
+import BasicWidget from "./basic_widget.js";
+import galleryManager from "../services/gallery_manager.js";
+import mediaViewer from "../services/media_viewer.js";
+import type { GalleryItem, GalleryConfig } from "../services/gallery_manager.js";
+import type { MediaViewerCallbacks } from "../services/media_viewer.js";
+import utils from "../services/utils.js";
+
+const TPL = /*html*/`
+<style>
+    .embedded-gallery-trigger {
+        position: relative;
+        display: inline-block;
+        cursor: pointer;
+        user-select: none;
+    }
+    
+    .embedded-gallery-trigger::after {
+        content: '';
+        position: absolute;
+        top: 8px;
+        right: 8px;
+        width: 32px;
+        height: 32px;
+        background: rgba(0, 0, 0, 0.6);
+        border-radius: 4px;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        opacity: 0;
+        transition: opacity 0.2s;
+        pointer-events: none;
+    }
+    
+    .embedded-gallery-trigger:hover::after {
+        opacity: 1;
+    }
+    
+    .embedded-gallery-trigger.has-gallery::after {
+        content: '\\f0660'; /* Gallery icon from boxicons font */
+        font-family: 'boxicons';
+        color: white;
+        font-size: 20px;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        line-height: 32px;
+        text-align: center;
+    }
+    
+    .gallery-indicator {
+        position: absolute;
+        top: 8px;
+        left: 8px;
+        background: rgba(0, 0, 0, 0.7);
+        color: white;
+        padding: 4px 8px;
+        border-radius: 4px;
+        font-size: 12px;
+        font-weight: bold;
+        pointer-events: none;
+        z-index: 1;
+    }
+    
+    .image-grid-view {
+        display: grid;
+        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
+        gap: 16px;
+        padding: 16px;
+    }
+    
+    .image-grid-item {
+        position: relative;
+        aspect-ratio: 1;
+        overflow: hidden;
+        border-radius: 8px;
+        cursor: pointer;
+        transition: transform 0.2s, box-shadow 0.2s;
+        background: var(--accented-background-color);
+    }
+    
+    .image-grid-item:hover {
+        transform: scale(1.05);
+        box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
+    }
+    
+    .image-grid-item img {
+        width: 100%;
+        height: 100%;
+        object-fit: cover;
+    }
+    
+    .image-grid-caption {
+        position: absolute;
+        bottom: 0;
+        left: 0;
+        right: 0;
+        background: linear-gradient(to top, rgba(0, 0, 0, 0.8), transparent);
+        color: white;
+        padding: 8px;
+        font-size: 12px;
+        opacity: 0;
+        transition: opacity 0.2s;
+    }
+    
+    .image-grid-item:hover .image-grid-caption {
+        opacity: 1;
+    }
+    
+    /* Mobile optimizations */
+    @media (max-width: 768px) {
+        .image-grid-view {
+            grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
+            gap: 8px;
+            padding: 8px;
+        }
+        
+        .gallery-indicator {
+            font-size: 10px;
+            padding: 2px 4px;
+        }
+    }
+</style>
+`;
+
+interface ImageElement {
+    element: HTMLImageElement;
+    src: string;
+    alt?: string;
+    title?: string;
+    caption?: string;
+    noteId?: string;
+    index: number;
+}
+
+export default class EmbeddedImageGallery extends BasicWidget {
+    private galleryItems: GalleryItem[] = [];
+    private imageElements: Map<HTMLElement, ImageElement> = new Map();
+    private observer?: MutationObserver;
+    private processingQueue: Set<HTMLElement> = new Set();
+    
+    doRender(): JQuery<HTMLElement> {
+        this.$widget = $(TPL);
+        this.setupMutationObserver();
+        return this.$widget;
+    }
+    
+    /**
+     * Initialize gallery for a container element
+     */
+    async initializeGallery(
+        container: HTMLElement | JQuery<HTMLElement>,
+        options?: {
+            selector?: string;
+            autoEnhance?: boolean;
+            gridView?: boolean;
+            galleryConfig?: GalleryConfig;
+        }
+    ): Promise<void> {
+        const $container = $(container);
+        const selector = options?.selector || 'img';
+        const autoEnhance = options?.autoEnhance !== false;
+        const gridView = options?.gridView || false;
+        
+        // Find all images in the container
+        const images = $container.find(selector).toArray() as HTMLImageElement[];
+        
+        if (images.length === 0) {
+            return;
+        }
+        
+        // Create gallery items
+        this.galleryItems = await this.createGalleryItems(images, $container);
+        
+        if (gridView) {
+            // Create grid view
+            this.createGridView($container, this.galleryItems);
+        } else if (autoEnhance) {
+            // Enhance individual images
+            this.enhanceImages(images);
+        }
+    }
+    
+    /**
+     * Create gallery items from image elements
+     */
+    private async createGalleryItems(
+        images: HTMLImageElement[],
+        $container: JQuery<HTMLElement>
+    ): Promise<GalleryItem[]> {
+        const items: GalleryItem[] = [];
+        
+        for (let i = 0; i < images.length; i++) {
+            const img = images[i];
+            
+            // Skip already processed images
+            if (img.dataset.galleryProcessed === 'true') {
+                continue;
+            }
+            
+            const item: GalleryItem = {
+                src: img.src,
+                alt: img.alt || `Image ${i + 1}`,
+                title: img.title || img.alt,
+                element: img,
+                index: i,
+                width: img.naturalWidth || undefined,
+                height: img.naturalHeight || undefined
+            };
+            
+            // Extract caption from figure element
+            const $img = $(img);
+            const $figure = $img.closest('figure');
+            if ($figure.length) {
+                const $caption = $figure.find('figcaption');
+                if ($caption.length) {
+                    item.caption = $caption.text();
+                }
+            }
+            
+            // Check for note ID in data attributes or URL
+            item.noteId = this.extractNoteId(img);
+            
+            // Get dimensions if not available
+            if (!item.width || !item.height) {
+                try {
+                    const dimensions = await mediaViewer.getImageDimensions(img.src);
+                    item.width = dimensions.width;
+                    item.height = dimensions.height;
+                } catch (error) {
+                    console.warn('Failed to get image dimensions:', error);
+                }
+            }
+            
+            items.push(item);
+            
+            // Store image element data
+            this.imageElements.set(img, {
+                element: img,
+                src: img.src,
+                alt: item.alt,
+                title: item.title,
+                caption: item.caption,
+                noteId: item.noteId,
+                index: i
+            });
+            
+            // Mark as processed
+            img.dataset.galleryProcessed = 'true';
+        }
+        
+        return items;
+    }
+    
+    /**
+     * Enhance individual images with gallery functionality
+     */
+    private enhanceImages(images: HTMLImageElement[]): void {
+        images.forEach((img, index) => {
+            const $img = $(img);
+            
+            // Wrap image in a trigger container if not already wrapped
+            if (!$img.parent().hasClass('embedded-gallery-trigger')) {
+                $img.wrap('<span class="embedded-gallery-trigger"></span>');
+            }
+            
+            const $trigger = $img.parent();
+            
+            // Add gallery indicator if multiple images
+            if (this.galleryItems.length > 1) {
+                $trigger.addClass('has-gallery');
+                
+                // Add count indicator
+                if (!$trigger.find('.gallery-indicator').length) {
+                    $trigger.prepend(`
+                        <span class="gallery-indicator" aria-label="Image ${index + 1} of ${this.galleryItems.length}">
+                            ${index + 1}/${this.galleryItems.length}
+                        </span>
+                    `);
+                }
+            }
+            
+            // Remove any existing click handlers
+            $img.off('click.gallery');
+            
+            // Add click handler to open gallery
+            $img.on('click.gallery', (e) => {
+                e.preventDefault();
+                e.stopPropagation();
+                this.openGallery(index);
+            });
+            
+            // Add keyboard support
+            $img.attr('tabindex', '0');
+            $img.attr('role', 'button');
+            $img.attr('aria-label', `${img.alt || 'Image'} - Click to open in gallery`);
+            
+            $img.on('keydown.gallery', (e) => {
+                if (e.key === 'Enter' || e.key === ' ') {
+                    e.preventDefault();
+                    this.openGallery(index);
+                }
+            });
+        });
+    }
+    
+    /**
+     * Create grid view of images
+     */
+    private createGridView($container: JQuery<HTMLElement>, items: GalleryItem[]): void {
+        const $grid = $('<div class="image-grid-view"></div>');
+        
+        items.forEach((item, index) => {
+            const $gridItem = $(`
+                <div class="image-grid-item" data-index="${index}" tabindex="0" role="button">
+                    <img src="${item.src}" alt="${item.alt}" loading="lazy" />
+                    ${item.caption ? `<div class="image-grid-caption">${item.caption}</div>` : ''}
+                </div>
+            `);
+            
+            $gridItem.on('click', () => this.openGallery(index));
+            $gridItem.on('keydown', (e) => {
+                if (e.key === 'Enter' || e.key === ' ') {
+                    e.preventDefault();
+                    this.openGallery(index);
+                }
+            });
+            
+            $grid.append($gridItem);
+        });
+        
+        // Replace container content with grid
+        $container.empty().append($grid);
+    }
+    
+    /**
+     * Open gallery at specified index
+     */
+    private openGallery(startIndex: number = 0): void {
+        if (this.galleryItems.length === 0) {
+            return;
+        }
+        
+        const config: GalleryConfig = {
+            showThumbnails: this.galleryItems.length > 1,
+            thumbnailHeight: 80,
+            autoPlay: false,
+            slideInterval: 4000,
+            showCounter: this.galleryItems.length > 1,
+            enableKeyboardNav: true,
+            enableSwipeGestures: true,
+            preloadCount: 2,
+            loop: true
+        };
+        
+        const callbacks: MediaViewerCallbacks = {
+            onOpen: () => {
+                console.log('Embedded gallery opened');
+                this.trigger('galleryOpened', { items: this.galleryItems, startIndex });
+            },
+            onClose: () => {
+                console.log('Embedded gallery closed');
+                this.trigger('galleryClosed');
+                
+                // Restore focus to the trigger element
+                const currentItem = this.galleryItems[galleryManager.getGalleryState()?.currentIndex || startIndex];
+                if (currentItem?.element) {
+                    (currentItem.element as HTMLElement).focus();
+                }
+            },
+            onChange: (index) => {
+                console.log('Gallery slide changed to:', index);
+                this.trigger('gallerySlideChanged', { index, item: this.galleryItems[index] });
+            },
+            onImageLoad: (index, item) => {
+                console.log('Gallery image loaded:', item.title);
+            },
+            onImageError: (index, item, error) => {
+                console.error('Failed to load gallery image:', error);
+            }
+        };
+        
+        if (this.galleryItems.length === 1) {
+            // Open single image
+            mediaViewer.openSingle(this.galleryItems[0], {
+                bgOpacity: 0.95,
+                showHideOpacity: true,
+                wheelToZoom: true,
+                pinchToClose: true
+            }, callbacks);
+        } else {
+            // Open gallery
+            galleryManager.openGallery(this.galleryItems, startIndex, config, callbacks);
+        }
+    }
+    
+    /**
+     * Extract note ID from image element
+     */
+    private extractNoteId(img: HTMLImageElement): string | undefined {
+        // Check data attribute
+        if (img.dataset.noteId) {
+            return img.dataset.noteId;
+        }
+        
+        // Try to extract from URL
+        const match = img.src.match(/\/api\/images\/([a-zA-Z0-9_]+)/);
+        if (match) {
+            return match[1];
+        }
+        
+        return undefined;
+    }
+    
+    /**
+     * Setup mutation observer to detect dynamically added images
+     */
+    private setupMutationObserver(): void {
+        this.observer = new MutationObserver((mutations) => {
+            const imagesToProcess: HTMLImageElement[] = [];
+            
+            mutations.forEach((mutation) => {
+                mutation.addedNodes.forEach((node) => {
+                    if (node.nodeType === Node.ELEMENT_NODE) {
+                        const element = node as HTMLElement;
+                        
+                        // Check if it's an image
+                        if (element.tagName === 'IMG') {
+                            imagesToProcess.push(element as HTMLImageElement);
+                        }
+                        
+                        // Check for images within the added element
+                        const images = element.querySelectorAll('img');
+                        images.forEach(img => imagesToProcess.push(img as HTMLImageElement));
+                    }
+                });
+            });
+            
+            if (imagesToProcess.length > 0) {
+                this.processNewImages(imagesToProcess);
+            }
+        });
+    }
+    
+    /**
+     * Process newly added images
+     */
+    private async processNewImages(images: HTMLImageElement[]): Promise<void> {
+        // Filter out already processed images
+        const newImages = images.filter(img => 
+            img.dataset.galleryProcessed !== 'true' && 
+            !this.processingQueue.has(img)
+        );
+        
+        if (newImages.length === 0) {
+            return;
+        }
+        
+        // Add to processing queue
+        newImages.forEach(img => this.processingQueue.add(img));
+        
+        try {
+            // Create gallery items for new images
+            const newItems = await this.createGalleryItems(newImages, $(document.body));
+            
+            // Add to existing gallery
+            this.galleryItems.push(...newItems);
+            
+            // Enhance the new images
+            this.enhanceImages(newImages);
+        } finally {
+            // Remove from processing queue
+            newImages.forEach(img => this.processingQueue.delete(img));
+        }
+    }
+    
+    /**
+     * Start observing a container for new images
+     */
+    observeContainer(container: HTMLElement): void {
+        if (!this.observer) {
+            this.setupMutationObserver();
+        }
+        
+        this.observer?.observe(container, {
+            childList: true,
+            subtree: true
+        });
+    }
+    
+    /**
+     * Stop observing
+     */
+    stopObserving(): void {
+        this.observer?.disconnect();
+    }
+    
+    /**
+     * Refresh gallery items
+     */
+    async refresh(): Promise<void> {
+        // Clear existing items
+        this.galleryItems = [];
+        this.imageElements.clear();
+        
+        // Mark all images as unprocessed
+        $('[data-gallery-processed="true"]').removeAttr('data-gallery-processed');
+        
+        // Re-initialize if there's a container
+        const $container = this.$widget?.parent();
+        if ($container?.length) {
+            await this.initializeGallery($container);
+        }
+    }
+    
+    /**
+     * Get current gallery items
+     */
+    getGalleryItems(): GalleryItem[] {
+        return this.galleryItems;
+    }
+    
+    /**
+     * Cleanup
+     */
+    cleanup(): void {
+        // Stop observing
+        this.stopObserving();
+        
+        // Close gallery if open
+        if (galleryManager.isGalleryOpen()) {
+            galleryManager.closeGallery();
+        }
+        
+        // Remove event handlers
+        $('[data-gallery-processed="true"]').off('.gallery');
+        
+        // Clear data
+        this.galleryItems = [];
+        this.imageElements.clear();
+        this.processingQueue.clear();
+        
+        super.cleanup();
+    }
+}

apps/client/src/widgets/media_viewer_widget.ts

@@ -0,0 +1,573 @@
+import { TypedBasicWidget } from "./basic_widget.js";
+import Component from "../components/component.js";
+import mediaViewerService from "../services/media_viewer.js";
+import type { MediaItem, MediaViewerConfig, MediaViewerCallbacks } from "../services/media_viewer.js";
+import type FNote from "../entities/fnote.js";
+import type { EventData } from "../components/app_context.js";
+import froca from "../services/froca.js";
+import utils from "../services/utils.js";
+import server from "../services/server.js";
+import toastService from "../services/toast.js";
+
+/**
+ * MediaViewerWidget provides a modern lightbox experience for viewing images
+ * and other media in Trilium Notes using PhotoSwipe 5.
+ * 
+ * This widget can be used in two modes:
+ * 1. As a standalone viewer for a single note's media
+ * 2. As a gallery viewer for multiple media items
+ */
+export class MediaViewerWidget extends TypedBasicWidget<Component> {
+    private currentNoteId: string | null = null;
+    private galleryItems: MediaItem[] = [];
+    private isGalleryMode: boolean = false;
+    private clickHandlers: Map<HTMLElement, () => void> = new Map();
+    private boundKeyboardHandler: ((event: KeyboardEvent) => void) | null = null;
+
+    constructor() {
+        super();
+        this.setupGlobalHandlers();
+    }
+
+    /**
+     * Setup global event handlers for media viewing
+     */
+    private setupGlobalHandlers(): void {
+        // Store bound handler for proper cleanup
+        this.boundKeyboardHandler = this.handleKeyboard.bind(this);
+        document.addEventListener('keydown', this.boundKeyboardHandler);
+        
+        // Cleanup will be called by parent class
+    }
+
+    /**
+     * Handle keyboard shortcuts with error boundary
+     */
+    private handleKeyboard(event: KeyboardEvent): void {
+        try {
+            // Only handle if viewer is open
+            if (!mediaViewerService.isOpen()) {
+                return;
+            }
+
+            switch (event.key) {
+                case 'ArrowLeft':
+                    mediaViewerService.prev();
+                    event.preventDefault();
+                    break;
+                case 'ArrowRight':
+                    mediaViewerService.next();
+                    event.preventDefault();
+                    break;
+                case 'Escape':
+                    mediaViewerService.close();
+                    event.preventDefault();
+                    break;
+            }
+        } catch (error) {
+            console.error('Error handling keyboard event:', error);
+        }
+    }
+
+    /**
+     * Open viewer for a single image note with comprehensive error handling
+     */
+    async openImageNote(noteId: string, config?: Partial<MediaViewerConfig>): Promise<void> {
+        try {
+            const note = await froca.getNote(noteId);
+            if (!note || note.type !== 'image') {
+                toastService.showError('Note is not an image');
+                return;
+            }
+
+            const item: MediaItem = {
+                src: utils.createImageSrcUrl(note),
+                alt: note.title || `Image ${noteId}`,
+                title: note.title || `Image ${noteId}`,
+                noteId: noteId
+            };
+
+            // Try to get image dimensions from attributes
+            const widthAttr = note.getAttribute('label', 'imageWidth');
+            const heightAttr = note.getAttribute('label', 'imageHeight');
+            
+            if (widthAttr && heightAttr) {
+                const width = parseInt(widthAttr.value);
+                const height = parseInt(heightAttr.value);
+                if (!isNaN(width) && !isNaN(height) && width > 0 && height > 0) {
+                    item.width = width;
+                    item.height = height;
+                }
+            }
+            
+            // Get dimensions dynamically if not available
+            if (!item.width || !item.height) {
+                try {
+                    const dimensions = await mediaViewerService.getImageDimensions(item.src);
+                    item.width = dimensions.width;
+                    item.height = dimensions.height;
+                } catch (error) {
+                    console.warn('Failed to get image dimensions, using defaults:', error);
+                    // Use default dimensions as fallback
+                    item.width = 800;
+                    item.height = 600;
+                }
+            }
+
+            const callbacks: MediaViewerCallbacks = {
+                onOpen: () => this.onViewerOpen(noteId),
+                onClose: () => this.onViewerClose(noteId),
+                onImageError: (index, errorItem, error) => this.onImageError(errorItem, error)
+            };
+
+            mediaViewerService.openSingle(item, config, callbacks);
+            this.currentNoteId = noteId;
+
+        } catch (error) {
+            console.error('Failed to open image note:', error);
+            const errorMessage = error instanceof Error ? error.message : 'Failed to open image';
+            toastService.showError(errorMessage);
+        }
+    }
+
+    /**
+     * Open viewer for multiple images (gallery mode) with isolated error handling
+     */
+    async openGallery(noteIds: string[], startIndex: number = 0, config?: Partial<MediaViewerConfig>): Promise<void> {
+        try {
+            const items: MediaItem[] = [];
+            const errors: Array<{ noteId: string; error: unknown }> = [];
+
+            // Process each note with isolated error handling
+            await Promise.all(noteIds.map(async (noteId) => {
+                try {
+                    const note = await froca.getNote(noteId);
+                    if (!note || note.type !== 'image') {
+                        return; // Skip non-image notes silently
+                    }
+
+                    const item: MediaItem = {
+                        src: utils.createImageSrcUrl(note),
+                        alt: note.title || `Image ${noteId}`,
+                        title: note.title || `Image ${noteId}`,
+                        noteId: noteId
+                    };
+
+                    // Try to get dimensions
+                    const widthAttr = note.getAttribute('label', 'imageWidth');
+                    const heightAttr = note.getAttribute('label', 'imageHeight');
+                    
+                    if (widthAttr && heightAttr) {
+                        const width = parseInt(widthAttr.value);
+                        const height = parseInt(heightAttr.value);
+                        if (!isNaN(width) && !isNaN(height) && width > 0 && height > 0) {
+                            item.width = width;
+                            item.height = height;
+                        }
+                    }
+
+                    // Use default dimensions if not available
+                    if (!item.width || !item.height) {
+                        item.width = 800;
+                        item.height = 600;
+                    }
+
+                    items.push(item);
+                } catch (error) {
+                    console.error(`Failed to process note ${noteId}:`, error);
+                    errors.push({ noteId, error });
+                }
+            }));
+
+            if (items.length === 0) {
+                if (errors.length > 0) {
+                    toastService.showError('Failed to load any images');
+                } else {
+                    toastService.showMessage('No images to display');
+                }
+                return;
+            }
+
+            // Show warning if some images failed
+            if (errors.length > 0) {
+                toastService.showMessage(`Loaded ${items.length} images (${errors.length} failed)`);
+            }
+
+            // Validate and adjust start index
+            if (startIndex < 0 || startIndex >= items.length) {
+                console.warn(`Invalid start index ${startIndex}, using 0`);
+                startIndex = 0;
+            }
+
+            const callbacks: MediaViewerCallbacks = {
+                onOpen: () => this.onGalleryOpen(),
+                onClose: () => this.onGalleryClose(),
+                onChange: (index) => this.onGalleryChange(index),
+                onImageError: (index, item, error) => this.onImageError(item, error)
+            };
+
+            mediaViewerService.open(items, startIndex, config, callbacks);
+            this.galleryItems = items;
+            this.isGalleryMode = true;
+
+        } catch (error) {
+            console.error('Failed to open gallery:', error);
+            const errorMessage = error instanceof Error ? error.message : 'Failed to open gallery';
+            toastService.showError(errorMessage);
+        }
+    }
+
+    /**
+     * Open viewer for images in note content
+     */
+    async openContentImages(noteId: string, container: HTMLElement, startIndex: number = 0): Promise<void> {
+        try {
+            const note = await froca.getNote(noteId);
+            if (!note) {
+                toastService.showError('Note not found');
+                return;
+            }
+
+            // Find all images in the container
+            const items = await mediaViewerService.createItemsFromContainer(container, 'img:not(.note-icon)');
+            
+            if (items.length === 0) {
+                toastService.showMessage('No images found in content');
+                return;
+            }
+
+            // Add note context to items
+            items.forEach(item => {
+                item.noteId = noteId;
+            });
+
+            const callbacks: MediaViewerCallbacks = {
+                onOpen: () => this.onContentViewerOpen(noteId),
+                onClose: () => this.onContentViewerClose(noteId),
+                onChange: (index) => this.onContentImageChange(index, items),
+                onImageError: (index, item, error) => this.onImageError(item, error)
+            };
+
+            const config: Partial<MediaViewerConfig> = {
+                getThumbBoundsFn: (index) => {
+                    // Get thumbnail bounds for zoom animation
+                    const item = items[index];
+                    if (item.element) {
+                        const rect = item.element.getBoundingClientRect();
+                        return { x: rect.left, y: rect.top, w: rect.width };
+                    }
+                    return undefined;
+                }
+            };
+
+            mediaViewerService.open(items, startIndex, config, callbacks);
+            this.currentNoteId = noteId;
+
+        } catch (error) {
+            console.error('Failed to open content images:', error);
+            toastService.showError('Failed to open images');
+        }
+    }
+
+    /**
+     * Attach click handlers to images in a container with accessibility
+     */
+    attachToContainer(container: HTMLElement, noteId: string): void {
+        try {
+            const images = container.querySelectorAll<HTMLImageElement>('img:not(.note-icon)');
+            
+            images.forEach((img, index) => {
+                // Skip if already has handler
+                if (this.clickHandlers.has(img)) {
+                    return;
+                }
+
+                const handler = () => {
+                    this.openContentImages(noteId, container, index).catch(error => {
+                        console.error('Failed to open content images:', error);
+                        toastService.showError('Failed to open image viewer');
+                    });
+                };
+
+                img.addEventListener('click', handler);
+                img.classList.add('media-viewer-trigger');
+                img.style.cursor = 'zoom-in';
+                
+                // Add accessibility attributes
+                img.setAttribute('role', 'button');
+                img.setAttribute('tabindex', '0');
+                img.setAttribute('aria-label', img.alt || 'Click to view image in fullscreen');
+                
+                // Add keyboard support for accessibility
+                const keyHandler = (event: KeyboardEvent) => {
+                    if (event.key === 'Enter' || event.key === ' ') {
+                        event.preventDefault();
+                        handler();
+                    }
+                };
+                img.addEventListener('keydown', keyHandler);
+                
+                // Store both handlers
+                this.clickHandlers.set(img, handler);
+            });
+        } catch (error) {
+            console.error('Failed to attach container handlers:', error);
+        }
+    }
+
+    /**
+     * Detach click handlers from a container
+     */
+    detachFromContainer(container: HTMLElement): void {
+        const images = container.querySelectorAll<HTMLImageElement>('img.media-viewer-trigger');
+        
+        images.forEach(img => {
+            const handler = this.clickHandlers.get(img);
+            if (handler) {
+                img.removeEventListener('click', handler);
+                img.classList.remove('media-viewer-trigger');
+                img.style.cursor = '';
+                this.clickHandlers.delete(img);
+            }
+        });
+    }
+
+    /**
+     * Called when viewer opens for a single image
+     */
+    private onViewerOpen(noteId: string): void {
+        // Log for debugging purposes
+        console.debug('Media viewer opened for note:', noteId);
+    }
+
+    /**
+     * Called when viewer closes for a single image
+     */
+    private onViewerClose(noteId: string): void {
+        this.currentNoteId = null;
+        console.debug('Media viewer closed for note:', noteId);
+    }
+
+    /**
+     * Called when gallery opens
+     */
+    private onGalleryOpen(): void {
+        console.debug('Gallery opened with', this.galleryItems.length, 'items');
+    }
+
+    /**
+     * Called when gallery closes
+     */
+    private onGalleryClose(): void {
+        this.isGalleryMode = false;
+        this.galleryItems = [];
+        console.debug('Gallery closed');
+    }
+
+    /**
+     * Called when gallery slide changes
+     */
+    private onGalleryChange(index: number): void {
+        const item = this.galleryItems[index];
+        if (item && item.noteId) {
+            console.debug('Gallery slide changed to index:', index, 'noteId:', item.noteId);
+        }
+    }
+
+    /**
+     * Called when content viewer opens
+     */
+    private onContentViewerOpen(noteId: string): void {
+        console.debug('Content viewer opened for note:', noteId);
+    }
+
+    /**
+     * Called when content viewer closes
+     */
+    private onContentViewerClose(noteId: string): void {
+        this.currentNoteId = null;
+        console.debug('Content viewer closed for note:', noteId);
+    }
+
+    /**
+     * Called when content image changes
+     */
+    private onContentImageChange(index: number, items: MediaItem[]): void {
+        console.debug('Content image changed to index:', index, 'of', items.length);
+    }
+
+    /**
+     * Handle image loading errors with graceful degradation
+     */
+    private onImageError(item: MediaItem, error?: Error): void {
+        const errorMessage = `Failed to load image: ${item.title || 'Unknown'}`;
+        console.error(errorMessage, { src: item.src, error });
+        
+        // Show user-friendly error message
+        toastService.showError(errorMessage);
+        
+        // Log the error for debugging
+        console.debug('Image load error:', { 
+            item, 
+            error: error?.message || 'Unknown error' 
+        });
+    }
+
+    /**
+     * Download current image
+     */
+    async downloadCurrent(): Promise<void> {
+        if (!mediaViewerService.isOpen()) {
+            return;
+        }
+
+        const index = mediaViewerService.getCurrentIndex();
+        const item = this.isGalleryMode ? this.galleryItems[index] : null;
+
+        if (item && item.noteId) {
+            try {
+                const note = await froca.getNote(item.noteId);
+                if (note) {
+                    const url = `api/notes/${note.noteId}/download`;
+                    window.open(url);
+                }
+            } catch (error) {
+                console.error('Failed to download image:', error);
+                toastService.showError('Failed to download image');
+            }
+        }
+    }
+
+    /**
+     * Copy image reference to clipboard
+     */
+    async copyImageReference(): Promise<void> {
+        if (!mediaViewerService.isOpen()) {
+            return;
+        }
+
+        const index = mediaViewerService.getCurrentIndex();
+        const item = this.isGalleryMode ? this.galleryItems[index] : null;
+
+        if (item && item.noteId) {
+            try {
+                const reference = `![](api/images/${item.noteId}/view)`;
+                await navigator.clipboard.writeText(reference);
+                toastService.showMessage('Image reference copied to clipboard');
+            } catch (error) {
+                console.error('Failed to copy image reference:', error);
+                toastService.showError('Failed to copy image reference');
+            }
+        }
+    }
+
+    /**
+     * Get metadata for current image with type safety
+     */
+    async getCurrentMetadata(): Promise<{
+        noteId: string;
+        title: string;
+        mime?: string;
+        fileSize?: string;
+        width?: number;
+        height?: number;
+        dateCreated?: string;
+        dateModified?: string;
+    } | null> {
+        try {
+            if (!mediaViewerService.isOpen()) {
+                return null;
+            }
+
+            const index = mediaViewerService.getCurrentIndex();
+            const item = this.isGalleryMode ? this.galleryItems[index] : null;
+
+            if (item && item.noteId) {
+                const note = await froca.getNote(item.noteId);
+                if (note) {
+                    const metadata = await note.getMetadata();
+                    return {
+                        noteId: note.noteId,
+                        title: note.title || 'Untitled',
+                        mime: note.mime,
+                        fileSize: note.getAttribute('label', 'fileSize')?.value,
+                        width: item.width,
+                        height: item.height,
+                        dateCreated: metadata.dateCreated,
+                        dateModified: metadata.dateModified
+                    };
+                }
+            }
+        } catch (error) {
+            console.error('Failed to get image metadata:', error);
+        }
+
+        return null;
+    }
+
+    /**
+     * Cleanup handlers and resources
+     */
+    cleanup(): void {
+        try {
+            // Close viewer if open
+            mediaViewerService.close();
+
+            // Remove all click handlers
+            this.clickHandlers.forEach((handler, element) => {
+                element.removeEventListener('click', handler);
+                element.classList.remove('media-viewer-trigger');
+                element.style.cursor = '';
+            });
+            this.clickHandlers.clear();
+
+            // Remove keyboard handler with proper reference
+            if (this.boundKeyboardHandler) {
+                document.removeEventListener('keydown', this.boundKeyboardHandler);
+                this.boundKeyboardHandler = null;
+            }
+
+            // Clear references
+            this.currentNoteId = null;
+            this.galleryItems = [];
+            this.isGalleryMode = false;
+        } catch (error) {
+            console.error('Error during MediaViewerWidget cleanup:', error);
+        }
+    }
+
+    /**
+     * Handle note changes
+     */
+    async entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">): Promise<void> {
+        // Refresh viewer if current note was reloaded
+        if (this.currentNoteId && loadResults.isNoteReloaded(this.currentNoteId)) {
+            // Close and reopen with updated data
+            if (mediaViewerService.isOpen()) {
+                const index = mediaViewerService.getCurrentIndex();
+                mediaViewerService.close();
+                
+                if (this.isGalleryMode) {
+                    const noteIds = this.galleryItems.map(item => item.noteId).filter(Boolean) as string[];
+                    await this.openGallery(noteIds, index);
+                } else {
+                    await this.openImageNote(this.currentNoteId);
+                }
+            }
+        }
+    }
+
+    /**
+     * Apply theme changes
+     */
+    themeChangedEvent(): void {
+        const isDarkTheme = document.body.classList.contains('theme-dark') || 
+                           document.body.classList.contains('theme-next-dark');
+        mediaViewerService.applyTheme(isDarkTheme);
+    }
+}
+
+// Create global instance for easy access
+const mediaViewerWidget = new MediaViewerWidget();
+
+export default mediaViewerWidget;

apps/client/src/widgets/type_widgets/abstract_text_type_widget.ts

@@ -6,6 +6,7 @@ import contentRenderer from "../../services/content_renderer.js";
 import utils from "../../services/utils.js";
 import options from "../../services/options.js";
 import attributes from "../../services/attributes.js";
+import ckeditorPhotoswipeIntegration from "../../services/ckeditor_photoswipe_integration.js";
 
 export default class AbstractTextTypeWidget extends TypeWidget {
     doRender() {
@@ -35,7 +36,29 @@ export default class AbstractTextTypeWidget extends TypeWidget {
         const parsedImage  = await this.parseFromImage($img);
 
         if (parsedImage) {
+            // Check if this is an attachment image and PhotoSwipe is available
+            if (parsedImage.viewScope?.attachmentId) {
+                // Instead of navigating to attachment detail, trigger PhotoSwipe
+                // Check if the image is already processed by PhotoSwipe
+                const imgElement = $img[0] as HTMLImageElement;
+                
+                // Check if PhotoSwipe is integrated with this image using multiple reliable indicators
+                const hasPhotoSwipe = imgElement.classList.contains('photoswipe-enabled') || 
+                                      imgElement.hasAttribute('data-photoswipe') ||
+                                      imgElement.style.cursor === 'zoom-in';
+                
+                if (hasPhotoSwipe) {
+                    // Image has PhotoSwipe integration, trigger click to open lightbox
+                    $img.trigger('click');
+                    return;
+                }
+                
+                // Otherwise, fall back to opening attachment detail (but with improved navigation)
                 appContext.tabManager.getActiveContext()?.setNote(parsedImage.noteId, { viewScope: parsedImage.viewScope });
+            } else {
+                // Regular note image, navigate normally
+                appContext.tabManager.getActiveContext()?.setNote(parsedImage.noteId, { viewScope: parsedImage.viewScope });
+            }
         } else {
             window.open($img.prop("src"), "_blank");
         }

apps/client/src/widgets/type_widgets/attachment_list.ts

@@ -4,6 +4,8 @@ import linkService from "../../services/link.js";
 import utils from "../../services/utils.js";
 import { t } from "../../services/i18n.js";
 import type { EventData } from "../../components/app_context.js";
+import galleryManager from "../../services/gallery_manager.js";
+import type { GalleryItem } from "../../services/gallery_manager.js";
 
 const TPL = /*html*/`
 <div class="attachment-list note-detail-printable">
@@ -20,17 +22,81 @@ const TPL = /*html*/`
             justify-content: space-between;
             align-items: baseline;
         }
+        
+        .attachment-list .gallery-toolbar {
+            display: flex;
+            gap: 5px;
+            margin-bottom: 10px;
+        }
+        
+        .attachment-list .gallery-toolbar button {
+            padding: 5px 10px;
+            font-size: 12px;
+        }
+        
+        .attachment-list .image-grid {
+            display: grid;
+            grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
+            gap: 10px;
+            margin-bottom: 20px;
+        }
+        
+        .attachment-list .image-grid .image-thumbnail {
+            position: relative;
+            width: 100%;
+            padding-bottom: 100%; /* 1:1 aspect ratio */
+            overflow: hidden;
+            border-radius: 4px;
+            cursor: pointer;
+            background: var(--accented-background-color);
+        }
+        
+        .attachment-list .image-grid .image-thumbnail img {
+            position: absolute;
+            top: 0;
+            left: 0;
+            width: 100%;
+            height: 100%;
+            object-fit: cover;
+            transition: transform 0.2s;
+        }
+        
+        .attachment-list .image-grid .image-thumbnail:hover img {
+            transform: scale(1.05);
+        }
+        
+        .attachment-list .image-grid .image-thumbnail .overlay {
+            position: absolute;
+            bottom: 0;
+            left: 0;
+            right: 0;
+            background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
+            color: white;
+            padding: 5px;
+            font-size: 11px;
+            opacity: 0;
+            transition: opacity 0.2s;
+        }
+        
+        .attachment-list .image-grid .image-thumbnail:hover .overlay {
+            opacity: 1;
+        }
     </style>
 
     <div class="links-wrapper"></div>
-
+    <div class="gallery-toolbar" style="display: none;"></div>
+    <div class="image-grid" style="display: none;"></div>
     <div class="attachment-list-wrapper"></div>
 </div>`;
 
 export default class AttachmentListTypeWidget extends TypeWidget {
     $list!: JQuery<HTMLElement>;
     $linksWrapper!: JQuery<HTMLElement>;
+    $galleryToolbar!: JQuery<HTMLElement>;
+    $imageGrid!: JQuery<HTMLElement>;
     renderedAttachmentIds!: Set<string>;
+    imageAttachments: GalleryItem[] = [];
+    otherAttachments: any[] = [];
 
     static getType() {
         return "attachmentList";
@@ -40,6 +106,8 @@ export default class AttachmentListTypeWidget extends TypeWidget {
         this.$widget = $(TPL);
         this.$list = this.$widget.find(".attachment-list-wrapper");
         this.$linksWrapper = this.$widget.find(".links-wrapper");
+        this.$galleryToolbar = this.$widget.find(".gallery-toolbar");
+        this.$imageGrid = this.$widget.find(".image-grid");
 
         super.doRender();
     }
@@ -75,8 +143,12 @@ export default class AttachmentListTypeWidget extends TypeWidget {
         );
 
         this.$list.empty();
+        this.$imageGrid.empty().hide();
+        this.$galleryToolbar.empty().hide();
         this.children = [];
         this.renderedAttachmentIds = new Set();
+        this.imageAttachments = [];
+        this.otherAttachments = [];
 
         const attachments = await note.getAttachments();
 
@@ -85,17 +157,122 @@ export default class AttachmentListTypeWidget extends TypeWidget {
             return;
         }
 
+        // Separate image and non-image attachments
         for (const attachment of attachments) {
+            if (attachment.role === 'image') {
+                const galleryItem: GalleryItem = {
+                    src: `/api/attachments/${attachment.attachmentId}/image`,
+                    alt: attachment.title,
+                    title: attachment.title,
+                    attachmentId: attachment.attachmentId,
+                    noteId: attachment.ownerId,
+                    index: this.imageAttachments.length
+                };
+                this.imageAttachments.push(galleryItem);
+            } else {
+                this.otherAttachments.push(attachment);
+            }
+        }
+
+        // If we have image attachments, show gallery view
+        if (this.imageAttachments.length > 0) {
+            this.setupGalleryView();
+        }
+
+        // Render non-image attachments in the traditional list
+        for (const attachment of this.otherAttachments) {
             const attachmentDetailWidget = new AttachmentDetailWidget(attachment, false);
-
             this.child(attachmentDetailWidget);
-
             this.renderedAttachmentIds.add(attachment.attachmentId);
-
             this.$list.append(attachmentDetailWidget.render());
         }
     }
 
+    setupGalleryView() {
+        // Show gallery toolbar
+        this.$galleryToolbar.show();
+        
+        // Add gallery action buttons
+        const $viewAllButton = $(`
+            <button class="btn btn-sm view-gallery-btn">
+                <span class="bx bx-images"></span>
+                View as Gallery (${this.imageAttachments.length} images)
+            </button>
+        `);
+        
+        const $slideshowButton = $(`
+            <button class="btn btn-sm slideshow-btn">
+                <span class="bx bx-play-circle"></span>
+                Start Slideshow
+            </button>
+        `);
+        
+        this.$galleryToolbar.append($viewAllButton, $slideshowButton);
+        
+        // Handle gallery view button
+        $viewAllButton.on('click', () => {
+            galleryManager.openGallery(this.imageAttachments, 0, {
+                showThumbnails: true,
+                showCounter: true,
+                enableKeyboardNav: true,
+                loop: true
+            });
+        });
+        
+        // Handle slideshow button
+        $slideshowButton.on('click', () => {
+            galleryManager.openGallery(this.imageAttachments, 0, {
+                showThumbnails: false,
+                autoPlay: true,
+                slideInterval: 4000,
+                showCounter: true,
+                loop: true
+            });
+        });
+        
+        // Create image grid
+        this.$imageGrid.show();
+        
+        this.imageAttachments.forEach((item, index) => {
+            const $thumbnail = $(`
+                <div class="image-thumbnail" 
+                     data-index="${index}"
+                     role="button"
+                     tabindex="0"
+                     aria-label="View ${item.alt || item.title || 'image'} in gallery">
+                    <img src="${item.src}" 
+                         alt="${item.alt || item.title || `Image ${index + 1}`}" 
+                         loading="lazy"
+                         aria-describedby="thumb-desc-${index}">
+                    <div class="overlay" id="thumb-desc-${index}">${item.title || ''}</div>
+                </div>
+            `);
+            
+            // Add click handler
+            $thumbnail.on('click', () => {
+                galleryManager.openGallery(this.imageAttachments, index, {
+                    showThumbnails: true,
+                    showCounter: true,
+                    enableKeyboardNav: true
+                });
+            });
+            
+            // Add keyboard support for accessibility
+            $thumbnail.on('keydown', (e) => {
+                if (e.key === 'Enter' || e.key === ' ') {
+                    e.preventDefault();
+                    galleryManager.openGallery(this.imageAttachments, index, {
+                        showThumbnails: true,
+                        showCounter: true,
+                        enableKeyboardNav: true
+                    });
+                }
+            });
+            
+            this.$imageGrid.append($thumbnail);
+        });
+    }
+
     async entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
         // updates and deletions are handled by the detail, for new attachments the whole list has to be refreshed
         const attachmentsAdded = loadResults.getAttachmentRows().some((att) => att.attachmentId && !this.renderedAttachmentIds.has(att.attachmentId));
@@ -104,4 +281,16 @@ export default class AttachmentListTypeWidget extends TypeWidget {
             this.refresh();
         }
     }
+    
+    cleanup() {
+        // Clean up event handlers
+        if (this.$galleryToolbar) {
+            this.$galleryToolbar.find('button').off();
+        }
+        if (this.$imageGrid) {
+            this.$imageGrid.find('.image-thumbnail').off();
+        }
+        
+        super.cleanup();
+    }
 }

apps/client/src/widgets/type_widgets/editable_text.ts

@@ -14,6 +14,7 @@ import type FNote from "../../entities/fnote.js";
 import { PopupEditor, ClassicEditor, EditorWatchdog, type CKTextEditor, type MentionFeed, type WatchdogConfig, EditorConfig } from "@triliumnext/ckeditor5";
 import "@triliumnext/ckeditor5/index.css";
 import { updateTemplateCache } from "./ckeditor/snippets.js";
+import ckeditorPhotoSwipe from "../../services/ckeditor_photoswipe_integration.js";
 
 const TPL = /*html*/`
 <div class="note-detail-editable-text note-detail-printable">
@@ -163,6 +164,19 @@ export default class EditableTextTypeWidget extends AbstractTextTypeWidget {
             };
             const editor = await buildEditor(this.$editor[0], isClassicEditor, opts);
             
+            // Setup PhotoSwipe integration for images in the editor
+            setTimeout(() => {
+                const editorElement = this.$editor[0];
+                if (editorElement) {
+                    ckeditorPhotoSwipe.setupContainer(editorElement, {
+                        enableGalleryMode: true,
+                        showHints: true,
+                        hintDelay: 2000,
+                        excludeSelector: '.cke_widget_element, .ck-widget'
+                    });
+                }
+            }, 100);
+
             const notificationsPlugin = editor.plugins.get("Notification");
             notificationsPlugin.on("show:warning", (evt, data) => {
                 const title = data.title;
@@ -291,11 +305,25 @@ export default class EditableTextTypeWidget extends AbstractTextTypeWidget {
     }
 
     cleanup() {
+        // Cleanup PhotoSwipe integration
+        if (this.$editor?.[0]) {
+            ckeditorPhotoSwipe.cleanupContainer(this.$editor[0]);
+        }
+        
         if (this.watchdog?.editor) {
             this.spacedUpdate.allowUpdateWithoutChange(() => {
                 this.watchdog.editor?.setData("");
             });
         }
+        
+        // Destroy the watchdog to clean up all CKEditor resources
+        if (this.watchdog) {
+            this.watchdog.destroy().catch((error: any) => {
+                console.error('Error destroying CKEditor watchdog:', error);
+            });
+        }
+        
+        super.cleanup();
     }
 
     insertDateTimeToTextCommand() {

apps/client/src/widgets/type_widgets/file.ts

@@ -1,5 +1,5 @@
 import openService from "../../services/open.js";
-import TypeWidget from "./type_widget.js";
+import { ImageViewerBase } from "./image_viewer_base.js";
 import { t } from "../../services/i18n.js";
 import type { EventData } from "../../components/app_context.js";
 import type FNote from "../../entities/fnote.js";
@@ -23,7 +23,8 @@ const TPL = /*html*/`
         }
 
         .note-detail.full-height .note-detail-file[data-preview-type="pdf"],
-        .note-detail.full-height .note-detail-file[data-preview-type="video"] {
+        .note-detail.full-height .note-detail-file[data-preview-type="video"],
+        .note-detail.full-height .note-detail-file[data-preview-type="image"] {
             overflow: hidden;
         }
 
@@ -39,6 +40,133 @@ const TPL = /*html*/`
             width: 100%;
             height: 100%;
         }
+
+        .image-file-preview {
+            display: flex;
+            flex-direction: column;
+            align-items: center;
+            justify-content: center;
+            height: 100%;
+            position: relative;
+            overflow: hidden;
+        }
+
+        .image-file-view {
+            max-width: 100%;
+            max-height: 90%;
+            cursor: zoom-in;
+            transition: opacity 0.2s ease;
+        }
+
+        .image-file-view:hover {
+            opacity: 0.95;
+        }
+
+        .image-file-controls {
+            position: absolute;
+            bottom: 20px;
+            right: 20px;
+            display: flex;
+            gap: 10px;
+            background: rgba(0, 0, 0, 0.6);
+            border-radius: 8px;
+            padding: 8px;
+            z-index: 10;
+        }
+
+        .image-file-control-btn {
+            background: rgba(255, 255, 255, 0.9);
+            border: none;
+            border-radius: 4px;
+            min-width: 44px;
+            min-height: 44px;
+            width: 44px;
+            height: 44px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            cursor: pointer;
+            transition: background 0.2s;
+        }
+
+        .image-file-control-btn:hover:not(:disabled) {
+            background: rgba(255, 255, 255, 1);
+        }
+
+        .image-file-control-btn:disabled {
+            opacity: 0.5;
+            cursor: not-allowed;
+        }
+
+        .image-file-control-btn i {
+            font-size: 20px;
+            color: #333;
+        }
+
+        .image-file-info {
+            position: absolute;
+            top: 10px;
+            left: 10px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 8px 12px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+        }
+
+        /* Loading indicator */
+        .image-loading-indicator {
+            position: absolute;
+            top: 50%;
+            left: 50%;
+            transform: translate(-50%, -50%);
+            z-index: 100;
+        }
+
+        /* Zoom indicator */
+        .zoom-indicator {
+            position: absolute;
+            bottom: 80px;
+            right: 20px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 4px 8px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+            pointer-events: none;
+        }
+
+        /* Mobile optimizations */
+        @media (max-width: 768px) {
+            .image-file-controls {
+                bottom: 10px;
+                right: 10px;
+                padding: 6px;
+                gap: 8px;
+            }
+
+            .image-file-info {
+                font-size: 11px;
+                padding: 6px 10px;
+            }
+        }
+
+        /* High contrast mode support */
+        @media (prefers-contrast: high) {
+            .image-file-control-btn {
+                border: 2px solid currentColor;
+            }
+        }
+
+        /* Reduced motion support */
+        @media (prefers-reduced-motion: reduce) {
+            .image-file-view,
+            .image-file-control-btn {
+                transition: none;
+            }
+        }
     </style>
 
     <div class="file-preview-too-big alert alert-info hidden-ext">
@@ -56,21 +184,66 @@ const TPL = /*html*/`
     <video class="video-preview" controls></video>
 
     <audio class="audio-preview" controls></audio>
+
+    <div class="image-file-preview" style="display: none;">
+        <div class="image-file-info">
+            <span class="image-dimensions"></span>
+        </div>
+        <img class="image-file-view" />
+        <div class="image-file-controls">
+            <button class="image-file-control-btn zoom-in" type="button" aria-label="Zoom In" title="Zoom In (+ key)">
+                <i class="bx bx-zoom-in" aria-hidden="true"></i>
+            </button>
+            <button class="image-file-control-btn zoom-out" type="button" aria-label="Zoom Out" title="Zoom Out (- key)">
+                <i class="bx bx-zoom-out" aria-hidden="true"></i>
+            </button>
+            <button class="image-file-control-btn reset-zoom" type="button" aria-label="Reset Zoom" title="Reset Zoom (0 key or double-click)">
+                <i class="bx bx-reset" aria-hidden="true"></i>
+            </button>
+            <button class="image-file-control-btn fullscreen" type="button" aria-label="Open in Lightbox" title="Open in Lightbox (Enter or Space key)">
+                <i class="bx bx-fullscreen" aria-hidden="true"></i>
+            </button>
+            <button class="image-file-control-btn download" type="button" aria-label="Download" title="Download File">
+                <i class="bx bx-download" aria-hidden="true"></i>
+            </button>
+        </div>
+    </div>
 </div>`;
 
-export default class FileTypeWidget extends TypeWidget {
+export default class FileTypeWidget extends ImageViewerBase {
-
     private $previewContent!: JQuery<HTMLElement>;
     private $previewNotAvailable!: JQuery<HTMLElement>;
     private $previewTooBig!: JQuery<HTMLElement>;
     private $pdfPreview!: JQuery<HTMLElement>;
     private $videoPreview!: JQuery<HTMLElement>;
     private $audioPreview!: JQuery<HTMLElement>;
+    private $imageFilePreview!: JQuery<HTMLElement>;
+    private $imageFileView!: JQuery<HTMLElement>;
+    private $imageDimensions!: JQuery<HTMLElement>;
+    private $fullscreenBtn!: JQuery<HTMLElement>;
+    private $downloadBtn!: JQuery<HTMLElement>;
+    private $zoomInBtn!: JQuery<HTMLElement>;
+    private $zoomOutBtn!: JQuery<HTMLElement>;
+    private $resetZoomBtn!: JQuery<HTMLElement>;
+    private wheelHandler?: (e: JQuery.TriggeredEvent) => void;
+    private currentPreviewType?: string;
 
     static getType() {
         return "file";
     }
 
+    constructor() {
+        super();
+        // Apply custom configuration for file viewer
+        this.applyConfig({
+            minZoom: 0.5,
+            maxZoom: 5,
+            zoomStep: 0.25,
+            debounceDelay: 16,
+            touchTargetSize: 44
+        });
+    }
+
     doRender() {
         this.$widget = $(TPL);
         this.$previewContent = this.$widget.find(".file-preview-content");
@@ -79,60 +252,204 @@ export default class FileTypeWidget extends TypeWidget {
         this.$pdfPreview = this.$widget.find(".pdf-preview");
         this.$videoPreview = this.$widget.find(".video-preview");
         this.$audioPreview = this.$widget.find(".audio-preview");
+        this.$imageFilePreview = this.$widget.find(".image-file-preview");
+        this.$imageFileView = this.$widget.find(".image-file-view");
+        this.$imageDimensions = this.$widget.find(".image-dimensions");
+        
+        // Image controls
+        this.$zoomInBtn = this.$widget.find(".zoom-in");
+        this.$zoomOutBtn = this.$widget.find(".zoom-out");
+        this.$resetZoomBtn = this.$widget.find(".reset-zoom");
+        this.$fullscreenBtn = this.$widget.find(".fullscreen");
+        this.$downloadBtn = this.$widget.find(".download");
+
+        // Set image wrapper and view for base class
+        this.$imageWrapper = this.$imageFilePreview;
+        this.$imageView = this.$imageFileView;
+
+        this.setupImageControls();
 
         super.doRender();
     }
 
+    private setupImageControls(): void {
+        // Image click to open lightbox
+        this.$imageFileView?.on("click", (e) => {
+            e.preventDefault();
+            this.openImageInLightbox();
+        });
+
+        // Control button handlers
+        this.$zoomInBtn?.on("click", () => this.zoomIn());
+        this.$zoomOutBtn?.on("click", () => this.zoomOut());
+        this.$resetZoomBtn?.on("click", () => this.resetZoom());
+        this.$fullscreenBtn?.on("click", () => this.openImageInLightbox());
+        this.$downloadBtn?.on("click", () => this.downloadFile());
+
+        // Mouse wheel zoom with focus check
+        this.wheelHandler = (e: JQuery.TriggeredEvent) => {
+            // Only handle if image preview is visible and has focus
+            if (!this.$imageFilePreview?.is(':visible') || !this.$widget?.is(':focus-within')) {
+                return;
+            }
+
+            e.preventDefault();
+            const originalEvent = e.originalEvent as WheelEvent | undefined;
+            const delta = originalEvent?.deltaY;
+            
+            if (delta) {
+                if (delta < 0) {
+                    this.zoomIn();
+                } else {
+                    this.zoomOut();
+                }
+            }
+        };
+
+        this.$imageFilePreview?.on("wheel", this.wheelHandler);
+    }
+
     async doRefresh(note: FNote) {
-        this.$widget.show();
+        this.$widget?.show();
 
         const blob = await this.note?.getBlob();
 
-        this.$previewContent.empty().hide();
+        // Hide all preview types
-        this.$pdfPreview.attr("src", "").empty().hide();
+        this.$previewContent?.empty().hide();
-        this.$previewNotAvailable.hide();
+        this.$pdfPreview?.attr("src", "").empty().hide();
-        this.$previewTooBig.addClass("hidden-ext");
+        this.$previewNotAvailable?.hide();
-        this.$videoPreview.hide();
+        this.$previewTooBig?.addClass("hidden-ext");
-        this.$audioPreview.hide();
+        this.$videoPreview?.hide();
+        this.$audioPreview?.hide();
+        this.$imageFilePreview?.hide();
 
         let previewType: string;
 
-        if (blob?.content) {
+        // Check if this is an image file
-            this.$previewContent.show().scrollTop(0);
+        if (note.mime.startsWith("image/")) {
+            this.$imageFilePreview?.show();
+            const src = openService.getUrlForDownload(`api/notes/${this.noteId}/open`);
+            
+            // Reset zoom for new image
+            this.resetZoom();
+            
+            // Setup pan, keyboard navigation, and other features
+            this.setupPanFunctionality();
+            this.setupKeyboardNavigation();
+            this.setupDoubleClickReset();
+            this.setupContextMenu();
+            this.addAccessibilityLabels();
+            
+            // Load image with loading state and error handling
+            try {
+                await this.setupImage(src, this.$imageFileView!);
+                await this.loadImageDimensions(src);
+            } catch (error) {
+                console.error("Failed to load image file:", error);
+            }
+            
+            previewType = "image";
+        } else if (blob?.content) {
+            this.$previewContent?.show().scrollTop(0);
             const trimmedContent = blob.content.substring(0, TEXT_MAX_NUM_CHARS);
             if (trimmedContent.length !== blob.content.length) {
-                this.$previewTooBig.removeClass("hidden-ext");
+                this.$previewTooBig?.removeClass("hidden-ext");
             }
-            this.$previewContent.text(trimmedContent);
+            this.$previewContent?.text(trimmedContent);
             previewType = "text";
         } else if (note.mime === "application/pdf") {
-            this.$pdfPreview.show().attr("src", openService.getUrlForDownload(`api/notes/${this.noteId}/open`));
+            this.$pdfPreview?.show().attr("src", openService.getUrlForDownload(`api/notes/${this.noteId}/open`));
             previewType = "pdf";
         } else if (note.mime.startsWith("video/")) {
             this.$videoPreview
-                .show()
+                ?.show()
                 .attr("src", openService.getUrlForDownload(`api/notes/${this.noteId}/open-partial`))
                 .attr("type", this.note?.mime ?? "")
-                .css("width", this.$widget.width() ?? 0);
+                .css("width", this.$widget?.width() ?? 0);
             previewType = "video";
         } else if (note.mime.startsWith("audio/")) {
             this.$audioPreview
-                .show()
+                ?.show()
                 .attr("src", openService.getUrlForDownload(`api/notes/${this.noteId}/open-partial`))
                 .attr("type", this.note?.mime ?? "")
-                .css("width", this.$widget.width() ?? 0);
+                .css("width", this.$widget?.width() ?? 0);
             previewType = "audio";
         } else {
-            this.$previewNotAvailable.show();
+            this.$previewNotAvailable?.show();
             previewType = "not-available";
         }
 
-        this.$widget.attr("data-preview-type", previewType ?? "");
+        this.currentPreviewType = previewType;
+        this.$widget?.attr("data-preview-type", previewType ?? "");
+    }
+
+    private async loadImageDimensions(src: string): Promise<void> {
+        try {
+            // Use a new Image object to get dimensions
+            const img = new Image();
+            
+            await new Promise<void>((resolve, reject) => {
+                img.onload = () => {
+                    this.$imageDimensions?.text(`${img.width} × ${img.height}px`);
+                    resolve();
+                };
+                img.onerror = () => {
+                    this.$imageDimensions?.text("Image");
+                    reject(new Error("Failed to load image dimensions"));
+                };
+                img.src = src;
+            });
+        } catch (error) {
+            console.warn("Failed to get image dimensions:", error);
+            this.$imageDimensions?.text("Image");
+        }
+    }
+
+    private openImageInLightbox(): void {
+        if (!this.note || !this.$imageFileView?.length) return;
+        
+        const src = this.$imageFileView.attr("src") || this.$imageFileView.prop("src");
+        if (!src) return;
+
+        this.openInLightbox(
+            src,
+            this.note.title || "Image File",
+            this.noteId,
+            this.$imageFileView.get(0)
+        );
+    }
+
+    private downloadFile(): void {
+        if (!this.note) return;
+        
+        try {
+            const link = document.createElement('a');
+            link.href = openService.getUrlForDownload(`api/notes/${this.noteId}/open`);
+            link.download = this.note.title || 'file';
+            
+            // Add to document, click, and remove
+            document.body.appendChild(link);
+            link.click();
+            document.body.removeChild(link);
+        } catch (error) {
+            console.error("Failed to download file:", error);
+            alert("Failed to download file. Please try again.");
+        }
     }
 
     async entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
         if (loadResults.isNoteReloaded(this.noteId)) {
-            this.refresh();
+            await this.refresh();
         }
     }
+
+    cleanup() {
+        // Remove wheel handler if it exists
+        if (this.wheelHandler && this.$imageFilePreview?.length) {
+            this.$imageFilePreview.off("wheel", this.wheelHandler);
+        }
+        
+        // Call parent cleanup
+        super.cleanup();
+    }
 }

apps/client/src/widgets/type_widgets/image.ts

@@ -1,10 +1,8 @@
 import utils from "../../services/utils.js";
-import TypeWidget from "./type_widget.js";
+import { ImageViewerBase } from "./image_viewer_base.js";
-import imageContextMenuService from "../../menus/image_context_menu.js";
 import imageService from "../../services/image.js";
 import type FNote from "../../entities/fnote.js";
 import type { EventData } from "../../components/app_context.js";
-import WheelZoom from 'vanilla-js-wheel-zoom';
 
 const TPL = /*html*/`
 <div class="note-detail-image note-detail-printable">
@@ -15,6 +13,7 @@ const TPL = /*html*/`
 
         .note-detail-image {
             height: 100%;
+            position: relative;
         }
 
         .note-detail-image-wrapper {
@@ -28,53 +27,314 @@ const TPL = /*html*/`
 
         .note-detail-image-view {
             display: block;
+            max-width: 100%;
+            max-height: 100%;
             width: auto;
             height: auto;
             align-self: center;
             flex-shrink: 0;
+            cursor: zoom-in;
+            transition: opacity 0.2s ease;
+        }
+
+        .note-detail-image-view:hover {
+            opacity: 0.95;
+        }
+
+        .image-controls {
+            position: absolute;
+            bottom: 20px;
+            right: 20px;
+            display: flex;
+            gap: 10px;
+            z-index: 10;
+            background: rgba(0, 0, 0, 0.6);
+            border-radius: 8px;
+            padding: 8px;
+        }
+
+        .image-control-btn {
+            background: rgba(255, 255, 255, 0.9);
+            border: none;
+            border-radius: 4px;
+            min-width: 44px;
+            min-height: 44px;
+            width: 44px;
+            height: 44px;
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            cursor: pointer;
+            transition: background 0.2s;
+        }
+
+        .image-control-btn:hover:not(:disabled) {
+            background: rgba(255, 255, 255, 1);
+        }
+
+        .image-control-btn:disabled {
+            opacity: 0.5;
+            cursor: not-allowed;
+        }
+
+        .image-control-btn i {
+            font-size: 20px;
+            color: #333;
+        }
+
+        /* Keyboard hints overlay */
+        .keyboard-hints {
+            position: absolute;
+            top: 10px;
+            right: 10px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 8px 12px;
+            border-radius: 4px;
+            font-size: 12px;
+            opacity: 0;
+            transition: opacity 0.3s;
+            pointer-events: none;
+            z-index: 10;
+        }
+
+        .note-detail-image:hover .keyboard-hints {
+            opacity: 0.8;
+        }
+
+        .keyboard-hints .hint {
+            margin: 2px 0;
+        }
+
+        .keyboard-hints .key {
+            background: rgba(255, 255, 255, 0.2);
+            padding: 2px 6px;
+            border-radius: 3px;
+            margin-right: 4px;
+            font-family: monospace;
+        }
+
+        /* Loading indicator */
+        .image-loading-indicator {
+            position: absolute;
+            top: 50%;
+            left: 50%;
+            transform: translate(-50%, -50%);
+            z-index: 100;
+        }
+
+        /* Zoom indicator */
+        .zoom-indicator {
+            position: absolute;
+            bottom: 80px;
+            right: 20px;
+            background: rgba(0, 0, 0, 0.7);
+            color: white;
+            padding: 4px 8px;
+            border-radius: 4px;
+            font-size: 12px;
+            z-index: 10;
+            pointer-events: none;
+        }
+
+        /* Mobile optimizations */
+        @media (max-width: 768px) {
+            .image-controls {
+                bottom: 10px;
+                right: 10px;
+                padding: 6px;
+                gap: 8px;
+            }
+
+            .keyboard-hints {
+                display: none;
+            }
+        }
+
+        /* High contrast mode support */
+        @media (prefers-contrast: high) {
+            .image-control-btn {
+                border: 2px solid currentColor;
+            }
+        }
+
+        /* Reduced motion support */
+        @media (prefers-reduced-motion: reduce) {
+            .note-detail-image-view,
+            .image-control-btn {
+                transition: none;
+            }
         }
     </style>
 
     <div class="note-detail-image-wrapper">
         <img class="note-detail-image-view" />
     </div>
+    
+    <div class="image-controls">
+        <button class="image-control-btn zoom-in" type="button" aria-label="Zoom In" title="Zoom In (+ key)">
+            <i class="bx bx-zoom-in" aria-hidden="true"></i>
+        </button>
+        <button class="image-control-btn zoom-out" type="button" aria-label="Zoom Out" title="Zoom Out (- key)">
+            <i class="bx bx-zoom-out" aria-hidden="true"></i>
+        </button>
+        <button class="image-control-btn reset-zoom" type="button" aria-label="Reset Zoom" title="Reset Zoom (0 key or double-click)">
+            <i class="bx bx-reset" aria-hidden="true"></i>
+        </button>
+        <button class="image-control-btn fullscreen" type="button" aria-label="Fullscreen" title="Fullscreen (Enter or Space key)">
+            <i class="bx bx-fullscreen" aria-hidden="true"></i>
+        </button>
+        <button class="image-control-btn download" type="button" aria-label="Download" title="Download Image">
+            <i class="bx bx-download" aria-hidden="true"></i>
+        </button>
+    </div>
+    
+    <div class="keyboard-hints" aria-hidden="true">
+        <div class="hint"><span class="key">Click</span> Open lightbox</div>
+        <div class="hint"><span class="key">Double-click</span> Reset zoom</div>
+        <div class="hint"><span class="key">Scroll</span> Zoom</div>
+        <div class="hint"><span class="key">+/-</span> Zoom in/out</div>
+        <div class="hint"><span class="key">0</span> Reset zoom</div>
+        <div class="hint"><span class="key">ESC</span> Close lightbox</div>
+        <div class="hint"><span class="key">Arrow keys</span> Pan (when zoomed)</div>
+    </div>
 </div>`;
 
-class ImageTypeWidget extends TypeWidget {
+class ImageTypeWidget extends ImageViewerBase {
-
+    private $zoomInBtn!: JQuery<HTMLElement>;
-    private $imageWrapper!: JQuery<HTMLElement>;
+    private $zoomOutBtn!: JQuery<HTMLElement>;
-    private $imageView!: JQuery<HTMLElement>;
+    private $resetZoomBtn!: JQuery<HTMLElement>;
+    private $fullscreenBtn!: JQuery<HTMLElement>;
+    private $downloadBtn!: JQuery<HTMLElement>;
+    private wheelHandler?: (e: JQuery.TriggeredEvent) => void;
 
     static getType() {
         return "image";
     }
 
+    constructor() {
+        super();
+        // Apply custom configuration if needed
+        this.applyConfig({
+            minZoom: 0.5,
+            maxZoom: 5,
+            zoomStep: 0.25,
+            debounceDelay: 16,
+            touchTargetSize: 44
+        });
+    }
+
     doRender() {
         this.$widget = $(TPL);
         this.$imageWrapper = this.$widget.find(".note-detail-image-wrapper");
-        this.$imageView = this.$widget.find(".note-detail-image-view").attr("id", `image-view-${utils.randomString(10)}`);
+        this.$imageView = this.$widget.find(".note-detail-image-view");
         
-        const initZoom = async () => {
+        // Generate unique ID for image element
-            const element = document.querySelector(`#${this.$imageView.attr("id")}`);
+        const imageId = `image-view-${utils.randomString(10)}`;
-            if (element) {
+        this.$imageView.attr("id", imageId);
-                WheelZoom.create(`#${this.$imageView.attr("id")}`, {
-                    maxScale: 50,
-                    speed: 1.3,
-                    zoomOnClick: false
-                });
-            } else {
-                requestAnimationFrame(initZoom);
-            }
-        };
-        initZoom();
         
-        imageContextMenuService.setupContextMenu(this.$imageView);
+        // Get control buttons
+        this.$zoomInBtn = this.$widget.find(".zoom-in");
+        this.$zoomOutBtn = this.$widget.find(".zoom-out");
+        this.$resetZoomBtn = this.$widget.find(".reset-zoom");
+        this.$fullscreenBtn = this.$widget.find(".fullscreen");
+        this.$downloadBtn = this.$widget.find(".download");
+
+        this.setupEventHandlers();
+        this.setupPanFunctionality();
+        this.setupKeyboardNavigation();
+        this.setupDoubleClickReset();
+        this.setupContextMenu();
+        this.addAccessibilityLabels();
 
         super.doRender();
     }
 
+    private setupEventHandlers(): void {
+        // Image click to open lightbox
+        this.$imageView?.on("click", async (e) => {
+            e.preventDefault();
+            await this.handleOpenLightbox();
+        });
+
+        // Control button handlers
+        this.$zoomInBtn?.on("click", () => this.zoomIn());
+        this.$zoomOutBtn?.on("click", () => this.zoomOut());
+        this.$resetZoomBtn?.on("click", () => this.resetZoom());
+        this.$fullscreenBtn?.on("click", async () => await this.handleOpenLightbox());
+        this.$downloadBtn?.on("click", () => this.downloadImage());
+
+        // Mouse wheel zoom with debouncing
+        this.wheelHandler = (e: JQuery.TriggeredEvent) => {
+            // Only handle if widget has focus
+            if (!this.$widget?.is(':focus-within')) {
+                return;
+            }
+
+            e.preventDefault();
+            const originalEvent = e.originalEvent as WheelEvent | undefined;
+            const delta = originalEvent?.deltaY;
+            
+            if (delta) {
+                if (delta < 0) {
+                    this.zoomIn();
+                } else {
+                    this.zoomOut();
+                }
+            }
+        };
+
+        this.$imageWrapper?.on("wheel", this.wheelHandler);
+    }
+
+    private async handleOpenLightbox(): Promise<void> {
+        if (!this.$imageView?.length) return;
+        
+        const src = this.$imageView.attr('src') || this.$imageView.prop('src');
+        if (!src) return;
+
+        await this.openInLightbox(
+            src,
+            this.note?.title,
+            this.noteId,
+            this.$imageView.get(0)
+        );
+    }
+
     async doRefresh(note: FNote) {
-        this.$imageView.prop("src", utils.createImageSrcUrl(note));
+        const src = utils.createImageSrcUrl(note);
+        
+        // Reset zoom when image changes
+        this.resetZoom();
+        
+        // Refresh gallery items when note changes
+        await this.refreshGalleryItems();
+        
+        // Setup image with loading state and error handling
+        try {
+            await this.setupImage(src, this.$imageView!);
+        } catch (error) {
+            console.error("Failed to load image:", error);
+            // Error message is already shown by setupImage
+        }
+    }
+
+    private downloadImage(): void {
+        if (!this.note) return;
+        
+        try {
+            const link = document.createElement('a');
+            link.href = utils.createImageSrcUrl(this.note);
+            link.download = this.note.title || 'image';
+            
+            // Add to document, click, and remove
+            document.body.appendChild(link);
+            link.click();
+            document.body.removeChild(link);
+        } catch (error) {
+            console.error("Failed to download image:", error);
+            alert("Failed to download image. Please try again.");
+        }
     }
 
     copyImageReferenceToClipboardEvent({ ntxId }: EventData<"copyImageReferenceToClipboard">) {
@@ -82,14 +342,26 @@ class ImageTypeWidget extends TypeWidget {
             return;
         }
 
+        if (this.$imageWrapper?.length) {
             imageService.copyImageReferenceToClipboard(this.$imageWrapper);
         }
+    }
 
     async entitiesReloadedEvent({ loadResults }: EventData<"entitiesReloaded">) {
         if (loadResults.isNoteReloaded(this.noteId)) {
-            this.refresh();
+            await this.refresh();
         }
     }
+
+    cleanup() {
+        // Remove wheel handler if it exists
+        if (this.wheelHandler && this.$imageWrapper?.length) {
+            this.$imageWrapper.off("wheel", this.wheelHandler);
+        }
+        
+        // Call parent cleanup
+        super.cleanup();
+    }
 }
 
 export default ImageTypeWidget;

apps/client/src/widgets/type_widgets/image_viewer_base.spec.ts

@@ -0,0 +1,352 @@
+import { ImageViewerBase } from './image_viewer_base.js';
+import mediaViewer from '../../services/media_viewer.js';
+
+// Mock mediaViewer
+jest.mock('../../services/media_viewer.js', () => ({
+    default: {
+        isOpen: jest.fn().mockReturnValue(false),
+        close: jest.fn(),
+        openSingle: jest.fn(),
+        getImageDimensions: jest.fn().mockResolvedValue({ width: 1920, height: 1080 })
+    }
+}));
+
+// Create a concrete test class
+class TestImageViewer extends ImageViewerBase {
+    static getType() {
+        return 'test';
+    }
+
+    doRender() {
+        this.$widget = $('<div class="test-widget" tabindex="0"></div>');
+        this.$imageWrapper = $('<div class="image-wrapper"></div>');
+        this.$imageView = $('<img class="image-view" />');
+        this.$widget.append(this.$imageWrapper.append(this.$imageView));
+        super.doRender();
+    }
+
+    async doRefresh() {
+        // Test implementation
+    }
+}
+
+describe('ImageViewerBase', () => {
+    let widget: TestImageViewer;
+    let $container: JQuery<HTMLElement>;
+
+    beforeEach(() => {
+        // Setup DOM container
+        $container = $('<div id="test-container"></div>');
+        $('body').append($container);
+        
+        widget = new TestImageViewer();
+        widget.doRender();
+        $container.append(widget.$widget!);
+    });
+
+    afterEach(() => {
+        widget.cleanup();
+        $container.remove();
+        jest.clearAllMocks();
+    });
+
+    describe('PhotoSwipe Verification', () => {
+        it('should verify PhotoSwipe availability on initialization', () => {
+            expect(widget['isPhotoSwipeAvailable']).toBe(true);
+        });
+
+        it('should handle PhotoSwipe not being available gracefully', () => {
+            const originalMediaViewer = mediaViewer;
+            // @ts-ignore - Temporarily set to undefined for testing
+            window.mediaViewer = undefined;
+            
+            const newWidget = new TestImageViewer();
+            expect(newWidget['isPhotoSwipeAvailable']).toBe(false);
+            
+            // @ts-ignore - Restore
+            window.mediaViewer = originalMediaViewer;
+        });
+    });
+
+    describe('Configuration', () => {
+        it('should have default configuration values', () => {
+            expect(widget['config'].minZoom).toBe(0.5);
+            expect(widget['config'].maxZoom).toBe(5);
+            expect(widget['config'].zoomStep).toBe(0.25);
+            expect(widget['config'].debounceDelay).toBe(16);
+            expect(widget['config'].touchTargetSize).toBe(44);
+        });
+
+        it('should allow configuration overrides', () => {
+            widget['applyConfig']({
+                minZoom: 0.2,
+                maxZoom: 10,
+                zoomStep: 0.5
+            });
+            
+            expect(widget['config'].minZoom).toBe(0.2);
+            expect(widget['config'].maxZoom).toBe(10);
+            expect(widget['config'].zoomStep).toBe(0.5);
+            expect(widget['config'].debounceDelay).toBe(16); // Unchanged
+        });
+    });
+
+    describe('Loading States', () => {
+        it('should show loading indicator when loading image', () => {
+            widget['showLoadingIndicator']();
+            expect(widget.$imageWrapper?.find('.image-loading-indicator').length).toBe(1);
+        });
+
+        it('should hide loading indicator after loading', () => {
+            widget['showLoadingIndicator']();
+            widget['hideLoadingIndicator']();
+            expect(widget.$imageWrapper?.find('.image-loading-indicator').length).toBe(0);
+        });
+
+        it('should handle image load errors gracefully', async () => {
+            const mockImage = {
+                onload: null as any,
+                onerror: null as any,
+                src: ''
+            };
+            
+            // @ts-ignore
+            global.Image = jest.fn(() => mockImage);
+            
+            const setupPromise = widget['setupImage']('test.jpg', widget.$imageView!);
+            
+            // Trigger error
+            mockImage.onerror(new Error('Failed to load'));
+            
+            await expect(setupPromise).rejects.toThrow('Failed to load image');
+            expect(widget.$imageWrapper?.find('.alert-danger').length).toBe(1);
+        });
+    });
+
+    describe('Zoom Functionality', () => {
+        it('should zoom in correctly', () => {
+            const initialZoom = widget['currentZoom'];
+            widget['zoomIn']();
+            
+            // Wait for debounce
+            jest.advanceTimersByTime(20);
+            
+            expect(widget['currentZoom']).toBeGreaterThan(initialZoom);
+        });
+
+        it('should zoom out correctly', () => {
+            widget['currentZoom'] = 2;
+            widget['zoomOut']();
+            
+            // Wait for debounce
+            jest.advanceTimersByTime(20);
+            
+            expect(widget['currentZoom']).toBeLessThan(2);
+        });
+
+        it('should respect zoom limits', () => {
+            // Test max zoom
+            widget['currentZoom'] = widget['config'].maxZoom;
+            widget['zoomIn']();
+            jest.advanceTimersByTime(20);
+            expect(widget['currentZoom']).toBe(widget['config'].maxZoom);
+            
+            // Test min zoom
+            widget['currentZoom'] = widget['config'].minZoom;
+            widget['zoomOut']();
+            jest.advanceTimersByTime(20);
+            expect(widget['currentZoom']).toBe(widget['config'].minZoom);
+        });
+
+        it('should reset zoom to 100%', () => {
+            widget['currentZoom'] = 3;
+            widget['resetZoom']();
+            expect(widget['currentZoom']).toBe(1);
+        });
+
+        it('should show zoom indicator when zooming', () => {
+            widget['updateZoomIndicator']();
+            expect(widget.$widget?.find('.zoom-indicator').length).toBe(1);
+            expect(widget.$widget?.find('.zoom-indicator').text()).toBe('100%');
+        });
+    });
+
+    describe('Keyboard Navigation', () => {
+        it('should only handle keyboard events when widget has focus', () => {
+            const preventDefaultSpy = jest.fn();
+            const stopPropagationSpy = jest.fn();
+            
+            // Simulate widget not having focus
+            widget.$widget?.blur();
+            
+            const event = $.Event('keydown', {
+                key: '+',
+                preventDefault: preventDefaultSpy,
+                stopPropagation: stopPropagationSpy
+            });
+            
+            widget.$widget?.trigger(event);
+            
+            expect(preventDefaultSpy).not.toHaveBeenCalled();
+            expect(stopPropagationSpy).not.toHaveBeenCalled();
+        });
+
+        it('should handle zoom keyboard shortcuts when focused', () => {
+            // Focus the widget
+            widget.$widget?.focus();
+            jest.spyOn(widget.$widget!, 'is').mockImplementation((selector) => {
+                if (selector === ':focus-within') return true;
+                return false;
+            });
+            
+            const zoomInSpy = jest.spyOn(widget as any, 'zoomIn');
+            
+            const event = $.Event('keydown', { key: '+' });
+            widget.$widget?.trigger(event);
+            
+            expect(zoomInSpy).toHaveBeenCalled();
+        });
+    });
+
+    describe('Pan Functionality', () => {
+        it('should setup pan event handlers', () => {
+            widget['setupPanFunctionality']();
+            expect(widget['boundHandlers'].size).toBeGreaterThan(0);
+        });
+
+        it('should only allow panning when zoomed in', () => {
+            widget['currentZoom'] = 1; // Not zoomed
+            const mouseDownEvent = $.Event('mousedown', { pageX: 100, pageY: 100 });
+            widget.$imageWrapper?.trigger(mouseDownEvent);
+            
+            expect(widget['isDragging']).toBe(false);
+            
+            // Now zoom in and try again
+            widget['currentZoom'] = 2;
+            widget.$imageWrapper?.trigger(mouseDownEvent);
+            
+            expect(widget['isDragging']).toBe(true);
+        });
+    });
+
+    describe('Accessibility', () => {
+        it('should add ARIA labels to buttons', () => {
+            const $button = $('<button class="zoom-in"></button>');
+            widget.$widget?.append($button);
+            
+            widget['addAccessibilityLabels']();
+            
+            expect($button.attr('aria-label')).toBe('Zoom in');
+            expect($button.attr('role')).toBe('button');
+        });
+
+        it('should make widget focusable with proper ARIA attributes', () => {
+            widget['setupKeyboardNavigation']();
+            
+            expect(widget.$widget?.attr('tabindex')).toBe('0');
+            expect(widget.$widget?.attr('role')).toBe('application');
+            expect(widget.$widget?.attr('aria-label')).toBeTruthy();
+        });
+    });
+
+    describe('Lightbox Integration', () => {
+        it('should open lightbox when PhotoSwipe is available', () => {
+            const openSingleSpy = jest.spyOn(mediaViewer, 'openSingle');
+            
+            widget['openInLightbox']('test.jpg', 'Test Image', 'note123');
+            
+            expect(openSingleSpy).toHaveBeenCalledWith(
+                expect.objectContaining({
+                    src: 'test.jpg',
+                    alt: 'Test Image',
+                    title: 'Test Image',
+                    noteId: 'note123'
+                }),
+                expect.any(Object),
+                expect.any(Object)
+            );
+        });
+
+        it('should fallback to opening in new tab when PhotoSwipe is not available', () => {
+            widget['isPhotoSwipeAvailable'] = false;
+            const windowOpenSpy = jest.spyOn(window, 'open').mockImplementation();
+            
+            widget['openInLightbox']('test.jpg', 'Test Image');
+            
+            expect(windowOpenSpy).toHaveBeenCalledWith('test.jpg', '_blank');
+            expect(mediaViewer.openSingle).not.toHaveBeenCalled();
+        });
+    });
+
+    describe('Memory Leak Prevention', () => {
+        it('should cleanup all event handlers on cleanup', () => {
+            widget['setupPanFunctionality']();
+            widget['setupKeyboardNavigation']();
+            
+            const initialHandlerCount = widget['boundHandlers'].size;
+            expect(initialHandlerCount).toBeGreaterThan(0);
+            
+            widget.cleanup();
+            
+            expect(widget['boundHandlers'].size).toBe(0);
+        });
+
+        it('should cancel animation frames on cleanup', () => {
+            const cancelAnimationFrameSpy = jest.spyOn(window, 'cancelAnimationFrame');
+            widget['rafId'] = 123;
+            
+            widget.cleanup();
+            
+            expect(cancelAnimationFrameSpy).toHaveBeenCalledWith(123);
+            expect(widget['rafId']).toBeNull();
+        });
+
+        it('should clear timers on cleanup', () => {
+            const clearTimeoutSpy = jest.spyOn(window, 'clearTimeout');
+            widget['zoomDebounceTimer'] = 456;
+            
+            widget.cleanup();
+            
+            expect(clearTimeoutSpy).toHaveBeenCalledWith(456);
+            expect(widget['zoomDebounceTimer']).toBeNull();
+        });
+
+        it('should close lightbox if open on cleanup', () => {
+            jest.spyOn(mediaViewer, 'isOpen').mockReturnValue(true);
+            const closeSpy = jest.spyOn(mediaViewer, 'close');
+            
+            widget.cleanup();
+            
+            expect(closeSpy).toHaveBeenCalled();
+        });
+    });
+
+    describe('Double-click Reset', () => {
+        it('should reset zoom on double-click', () => {
+            widget['currentZoom'] = 3;
+            widget['setupDoubleClickReset']();
+            
+            const dblClickEvent = $.Event('dblclick');
+            widget.$imageView?.trigger(dblClickEvent);
+            
+            expect(widget['currentZoom']).toBe(1);
+        });
+    });
+
+    describe('Error Handling', () => {
+        it('should show error message to user on failure', () => {
+            widget['showErrorMessage']('Test error message');
+            
+            const $error = widget.$imageWrapper?.find('.alert-danger');
+            expect($error?.length).toBe(1);
+            expect($error?.text()).toBe('Test error message');
+        });
+
+        it('should handle null/undefined elements safely', () => {
+            widget.$imageView = undefined;
+            
+            // Should not throw
+            expect(() => widget['setupImage']('test.jpg', widget.$imageView!)).not.toThrow();
+        });
+    });
+});

apps/client/src/widgets/type_widgets/image_viewer_base.ts

@@ -0,0 +1,787 @@
+/**
+ * Base class for widgets that display images with zoom, pan, and lightbox functionality.
+ * Provides shared image viewing logic to avoid code duplication.
+ */
+import TypeWidget from "./type_widget.js";
+import mediaViewer from "../../services/media_viewer.js";
+import type { MediaItem, MediaViewerCallbacks } from "../../services/media_viewer.js";
+import imageContextMenuService from "../../menus/image_context_menu.js";
+import galleryManager from "../../services/gallery_manager.js";
+import type { GalleryItem, GalleryConfig } from "../../services/gallery_manager.js";
+
+export interface ImageViewerConfig {
+    minZoom?: number;
+    maxZoom?: number;
+    zoomStep?: number;
+    debounceDelay?: number;
+    touchTargetSize?: number;
+}
+
+export abstract class ImageViewerBase extends TypeWidget {
+    // Configuration
+    protected config: Required<ImageViewerConfig> = {
+        minZoom: 0.5,
+        maxZoom: 5,
+        zoomStep: 0.25,
+        debounceDelay: 16, // ~60fps
+        touchTargetSize: 44 // WCAG recommended minimum
+    };
+
+    // State
+    protected currentZoom: number = 1;
+    protected isDragging: boolean = false;
+    protected startX: number = 0;
+    protected startY: number = 0;
+    protected scrollLeft: number = 0;
+    protected scrollTop: number = 0;
+    protected isPhotoSwipeAvailable: boolean = false;
+    protected isLoadingImage: boolean = false;
+    protected galleryItems: GalleryItem[] = [];
+    protected currentImageIndex: number = 0;
+
+    // Elements
+    protected $imageWrapper?: JQuery<HTMLElement>;
+    protected $imageView?: JQuery<HTMLElement>;
+    protected $zoomIndicator?: JQuery<HTMLElement>;
+    protected $loadingIndicator?: JQuery<HTMLElement>;
+
+    // Event handler references for cleanup
+    private boundHandlers: Map<string, Function> = new Map();
+    private rafId: number | null = null;
+    private zoomDebounceTimer: number | null = null;
+
+    constructor() {
+        super();
+        this.verifyPhotoSwipe();
+    }
+
+    /**
+     * Verify PhotoSwipe is available
+     */
+    protected verifyPhotoSwipe(): void {
+        try {
+            // Check if PhotoSwipe is loaded
+            if (typeof mediaViewer !== 'undefined' && mediaViewer) {
+                this.isPhotoSwipeAvailable = true;
+            } else {
+                console.warn("PhotoSwipe/mediaViewer not available, lightbox features disabled");
+                this.isPhotoSwipeAvailable = false;
+            }
+        } catch (error) {
+            console.error("Error checking PhotoSwipe availability:", error);
+            this.isPhotoSwipeAvailable = false;
+        }
+    }
+
+    /**
+     * Apply configuration overrides
+     */
+    protected applyConfig(overrides?: ImageViewerConfig): void {
+        if (overrides) {
+            this.config = { ...this.config, ...overrides };
+        }
+    }
+
+    /**
+     * Show loading indicator
+     */
+    protected showLoadingIndicator(): void {
+        if (!this.$loadingIndicator) {
+            this.$loadingIndicator = $('<div class="image-loading-indicator">')
+                .html('<div class="spinner-border spinner-border-sm" role="status"><span class="sr-only">Loading...</span></div>')
+                .css({
+                    position: 'absolute',
+                    top: '50%',
+                    left: '50%',
+                    transform: 'translate(-50%, -50%)',
+                    zIndex: 100
+                });
+        }
+        this.$imageWrapper?.append(this.$loadingIndicator);
+        this.isLoadingImage = true;
+    }
+
+    /**
+     * Hide loading indicator
+     */
+    protected hideLoadingIndicator(): void {
+        this.$loadingIndicator?.remove();
+        this.isLoadingImage = false;
+    }
+
+    /**
+     * Setup image with loading state and error handling
+     */
+    protected async setupImage(src: string, $image: JQuery<HTMLElement>): Promise<void> {
+        if (!$image || !$image.length) {
+            console.error("Image element not provided");
+            return;
+        }
+
+        this.showLoadingIndicator();
+
+        return new Promise((resolve, reject) => {
+            const img = new Image();
+            
+            img.onload = () => {
+                this.hideLoadingIndicator();
+                $image.attr('src', src);
+                
+                // Preload dimensions for PhotoSwipe if available
+                if (this.isPhotoSwipeAvailable) {
+                    this.preloadImageDimensions(src).catch(console.warn);
+                }
+                
+                resolve();
+            };
+            
+            img.onerror = (error) => {
+                this.hideLoadingIndicator();
+                console.error("Failed to load image:", error);
+                this.showErrorMessage("Failed to load image");
+                reject(new Error("Failed to load image"));
+            };
+            
+            img.src = src;
+        });
+    }
+
+    /**
+     * Show error message to user
+     */
+    protected showErrorMessage(message: string): void {
+        const $error = $('<div class="alert alert-danger">')
+            .text(message)
+            .css({
+                position: 'absolute',
+                top: '50%',
+                left: '50%',
+                transform: 'translate(-50%, -50%)',
+                maxWidth: '80%'
+            });
+        
+        this.$imageWrapper?.empty().append($error);
+    }
+
+    /**
+     * Preload image dimensions for PhotoSwipe
+     */
+    protected async preloadImageDimensions(src: string): Promise<void> {
+        if (!this.isPhotoSwipeAvailable) return;
+        
+        try {
+            await mediaViewer.getImageDimensions(src);
+        } catch (error) {
+            console.warn("Failed to preload image dimensions:", error);
+        }
+    }
+
+    /**
+     * Detect and collect gallery items from the current context
+     */
+    protected async detectGalleryItems(): Promise<GalleryItem[]> {
+        // Default implementation - can be overridden by subclasses
+        if (this.note && this.note.type === 'text') {
+            // For text notes, scan for all images
+            return await galleryManager.createGalleryFromNote(this.note);
+        }
+        
+        // For single image notes, return just the current image
+        const src = this.$imageView?.attr('src') || this.$imageView?.prop('src');
+        if (src) {
+            return [{
+                src: src,
+                alt: this.note?.title || 'Image',
+                title: this.note?.title,
+                noteId: this.noteId,
+                index: 0
+            }];
+        }
+        
+        return [];
+    }
+
+    /**
+     * Open image in lightbox with gallery support
+     */
+    protected async openInLightbox(src: string, title?: string, noteId?: string, element?: HTMLElement): Promise<void> {
+        if (!this.isPhotoSwipeAvailable) {
+            console.warn("PhotoSwipe not available, cannot open lightbox");
+            // Fallback: open image in new tab
+            window.open(src, '_blank');
+            return;
+        }
+
+        if (!src) {
+            console.error("No image source provided for lightbox");
+            return;
+        }
+
+        try {
+            // Detect if we should open as a gallery
+            if (this.galleryItems.length === 0) {
+                this.galleryItems = await this.detectGalleryItems();
+            }
+            
+            // Find the index of the current image in the gallery
+            let startIndex = 0;
+            if (this.galleryItems.length > 1) {
+                startIndex = this.galleryItems.findIndex(item => item.src === src);
+                if (startIndex === -1) startIndex = 0;
+            }
+            
+            // Open as gallery if multiple items, otherwise single image
+            if (this.galleryItems.length > 1) {
+                // Open gallery with all images
+                const galleryConfig: GalleryConfig = {
+                    showThumbnails: true,
+                    thumbnailHeight: 80,
+                    autoPlay: false,
+                    slideInterval: 4000,
+                    showCounter: true,
+                    enableKeyboardNav: true,
+                    enableSwipeGestures: true,
+                    preloadCount: 2,
+                    loop: true
+                };
+                
+                const callbacks: MediaViewerCallbacks = {
+                    onOpen: () => {
+                        console.log("Gallery opened with", this.galleryItems.length, "images");
+                    },
+                    onClose: () => {
+                        console.log("Gallery closed");
+                        // Restore focus to the image element
+                        element?.focus();
+                    },
+                    onChange: (index) => {
+                        console.log("Gallery slide changed to:", index);
+                        this.currentImageIndex = index;
+                    },
+                    onImageLoad: (index, mediaItem) => {
+                        console.log("Gallery image loaded:", mediaItem.title);
+                    },
+                    onImageError: (index, mediaItem, error) => {
+                        console.error("Failed to load gallery image:", error);
+                    }
+                };
+                
+                galleryManager.openGallery(this.galleryItems, startIndex, galleryConfig, callbacks);
+            } else {
+                // Open single image
+                const item: MediaItem = {
+                    src: src,
+                    alt: title || "Image",
+                    title: title,
+                    noteId: noteId,
+                    element: element
+                };
+
+            const callbacks: MediaViewerCallbacks = {
+                onOpen: () => {
+                    console.log("Image lightbox opened");
+                },
+                onClose: () => {
+                    console.log("Image lightbox closed");
+                    // Restore focus to the image element
+                    element?.focus();
+                },
+                onImageLoad: (index, mediaItem) => {
+                    console.log("Image loaded in lightbox:", mediaItem.title);
+                },
+                onImageError: (index, mediaItem, error) => {
+                    console.error("Failed to load image in lightbox:", error);
+                }
+            };
+
+                // Open with enhanced configuration
+                mediaViewer.openSingle(item, {
+                bgOpacity: 0.95,
+                showHideOpacity: true,
+                pinchToClose: true,
+                closeOnScroll: false,
+                closeOnVerticalDrag: true,
+                wheelToZoom: true,
+                arrowKeys: false,
+                loop: false,
+                maxSpreadZoom: 10,
+                getThumbBoundsFn: (index: number) => {
+                    // Get position of thumbnail for zoom animation
+                    if (element) {
+                        const rect = element.getBoundingClientRect();
+                        return {
+                            x: rect.left,
+                            y: rect.top,
+                            w: rect.width
+                        };
+                    }
+                    return undefined;
+                }
+                }, callbacks);
+            }
+        } catch (error) {
+            console.error("Failed to open lightbox:", error);
+            // Fallback: open image in new tab
+            window.open(src, '_blank');
+        }
+    }
+
+    /**
+     * Zoom in with debouncing
+     */
+    protected zoomIn(): void {
+        if (this.zoomDebounceTimer) {
+            clearTimeout(this.zoomDebounceTimer);
+        }
+        
+        this.zoomDebounceTimer = window.setTimeout(() => {
+            this.currentZoom = Math.min(this.currentZoom + this.config.zoomStep, this.config.maxZoom);
+            this.applyZoom();
+        }, this.config.debounceDelay);
+    }
+
+    /**
+     * Zoom out with debouncing
+     */
+    protected zoomOut(): void {
+        if (this.zoomDebounceTimer) {
+            clearTimeout(this.zoomDebounceTimer);
+        }
+        
+        this.zoomDebounceTimer = window.setTimeout(() => {
+            this.currentZoom = Math.max(this.currentZoom - this.config.zoomStep, this.config.minZoom);
+            this.applyZoom();
+        }, this.config.debounceDelay);
+    }
+
+    /**
+     * Reset zoom to 100%
+     */
+    protected resetZoom(): void {
+        this.currentZoom = 1;
+        this.applyZoom();
+        
+        if (this.$imageWrapper?.length) {
+            this.$imageWrapper.scrollLeft(0).scrollTop(0);
+        }
+    }
+
+    /**
+     * Apply zoom with requestAnimationFrame for smooth performance
+     */
+    protected applyZoom(): void {
+        if (this.rafId) {
+            cancelAnimationFrame(this.rafId);
+        }
+        
+        this.rafId = requestAnimationFrame(() => {
+            if (!this.$imageView?.length) return;
+            
+            this.$imageView.css({
+                transform: `scale(${this.currentZoom})`,
+                transformOrigin: 'center center'
+            });
+            
+            // Update zoom indicator
+            this.updateZoomIndicator();
+            
+            // Update button states
+            this.updateZoomButtonStates();
+            
+            // Update cursor based on zoom level
+            if (this.currentZoom > 1) {
+                this.$imageView.css('cursor', 'move');
+            } else {
+                this.$imageView.css('cursor', 'zoom-in');
+            }
+        });
+    }
+
+    /**
+     * Update zoom percentage indicator
+     */
+    protected updateZoomIndicator(): void {
+        const percentage = Math.round(this.currentZoom * 100);
+        
+        if (!this.$zoomIndicator) {
+            this.$zoomIndicator = $('<div class="zoom-indicator">')
+                .css({
+                    position: 'absolute',
+                    bottom: '60px',
+                    right: '20px',
+                    background: 'rgba(0, 0, 0, 0.7)',
+                    color: 'white',
+                    padding: '4px 8px',
+                    borderRadius: '4px',
+                    fontSize: '12px',
+                    zIndex: 10
+                })
+                .attr('aria-live', 'polite')
+                .attr('aria-label', 'Zoom level');
+            
+            this.$widget?.append(this.$zoomIndicator);
+        }
+        
+        this.$zoomIndicator.text(`${percentage}%`);
+        
+        // Hide indicator after 2 seconds
+        if (this.$zoomIndicator.data('hideTimer')) {
+            clearTimeout(this.$zoomIndicator.data('hideTimer'));
+        }
+        
+        this.$zoomIndicator.show();
+        const hideTimer = setTimeout(() => {
+            this.$zoomIndicator?.fadeOut();
+        }, 2000);
+        
+        this.$zoomIndicator.data('hideTimer', hideTimer);
+    }
+
+    /**
+     * Update zoom button states
+     */
+    protected updateZoomButtonStates(): void {
+        const $zoomInBtn = this.$widget?.find('.zoom-in, .image-control-btn.zoom-in');
+        const $zoomOutBtn = this.$widget?.find('.zoom-out, .image-control-btn.zoom-out');
+        
+        if ($zoomInBtn?.length) {
+            $zoomInBtn.prop('disabled', this.currentZoom >= this.config.maxZoom);
+            $zoomInBtn.attr('aria-disabled', (this.currentZoom >= this.config.maxZoom).toString());
+        }
+        
+        if ($zoomOutBtn?.length) {
+            $zoomOutBtn.prop('disabled', this.currentZoom <= this.config.minZoom);
+            $zoomOutBtn.attr('aria-disabled', (this.currentZoom <= this.config.minZoom).toString());
+        }
+    }
+
+    /**
+     * Setup pan functionality with proper event cleanup
+     */
+    protected setupPanFunctionality(): void {
+        if (!this.$imageWrapper?.length) return;
+
+        // Create bound handlers for cleanup
+        const handleMouseDown = this.handleMouseDown.bind(this);
+        const handleMouseMove = this.handleMouseMove.bind(this);
+        const handleMouseUp = this.handleMouseUp.bind(this);
+        const handleTouchStart = this.handleTouchStart.bind(this);
+        const handleTouchMove = this.handleTouchMove.bind(this);
+        const handlePinchZoom = this.handlePinchZoom.bind(this);
+
+        // Store references for cleanup
+        this.boundHandlers.set('mousedown', handleMouseDown);
+        this.boundHandlers.set('mousemove', handleMouseMove);
+        this.boundHandlers.set('mouseup', handleMouseUp);
+        this.boundHandlers.set('touchstart', handleTouchStart);
+        this.boundHandlers.set('touchmove', handleTouchMove);
+        this.boundHandlers.set('pinchzoom', handlePinchZoom);
+
+        // Mouse events
+        this.$imageWrapper.on('mousedown', handleMouseDown);
+        
+        // Document-level mouse events (for dragging outside wrapper)
+        $(document).on('mousemove', handleMouseMove);
+        $(document).on('mouseup', handleMouseUp);
+
+        // Touch events
+        this.$imageWrapper.on('touchstart', handleTouchStart);
+        this.$imageWrapper.on('touchmove', handleTouchMove);
+        
+        // Pinch zoom
+        this.$imageWrapper.on('touchstart', handlePinchZoom);
+        this.$imageWrapper.on('touchmove', handlePinchZoom);
+    }
+
+    private handleMouseDown(e: JQuery.MouseDownEvent): void {
+        if (this.currentZoom <= 1 || !this.$imageWrapper) return;
+        
+        this.isDragging = true;
+        
+        const offset = this.$imageWrapper.offset();
+        if (offset) {
+            this.startX = e.pageX - offset.left;
+            this.startY = e.pageY - offset.top;
+        }
+        
+        this.scrollLeft = this.$imageWrapper.scrollLeft() ?? 0;
+        this.scrollTop = this.$imageWrapper.scrollTop() ?? 0;
+        
+        this.$imageWrapper.css('cursor', 'grabbing');
+        e.preventDefault();
+    }
+
+    private handleMouseMove(e: JQuery.MouseMoveEvent): void {
+        if (!this.isDragging || !this.$imageWrapper) return;
+        
+        e.preventDefault();
+        
+        const offset = this.$imageWrapper.offset();
+        if (offset) {
+            const x = e.pageX - offset.left;
+            const y = e.pageY - offset.top;
+            const walkX = (x - this.startX) * 2;
+            const walkY = (y - this.startY) * 2;
+            
+            this.$imageWrapper.scrollLeft(this.scrollLeft - walkX);
+            this.$imageWrapper.scrollTop(this.scrollTop - walkY);
+        }
+    }
+
+    private handleMouseUp(): void {
+        if (this.isDragging) {
+            this.isDragging = false;
+            if (this.currentZoom > 1 && this.$imageWrapper) {
+                this.$imageWrapper.css('cursor', 'move');
+            }
+        }
+    }
+
+    private handleTouchStart(e: JQuery.TouchStartEvent): void {
+        if (this.currentZoom <= 1 || !this.$imageWrapper) return;
+        
+        const touch = e.originalEvent?.touches[0];
+        if (touch) {
+            this.startX = touch.clientX;
+            this.startY = touch.clientY;
+            this.scrollLeft = this.$imageWrapper.scrollLeft() ?? 0;
+            this.scrollTop = this.$imageWrapper.scrollTop() ?? 0;
+        }
+    }
+
+    private handleTouchMove(e: JQuery.TouchMoveEvent): void {
+        if (this.currentZoom <= 1 || !this.$imageWrapper) return;
+        
+        const touches = e.originalEvent?.touches;
+        if (touches && touches.length === 1) {
+            e.preventDefault();
+            const touch = touches[0];
+            const deltaX = this.startX - touch.clientX;
+            const deltaY = this.startY - touch.clientY;
+            
+            this.$imageWrapper.scrollLeft(this.scrollLeft + deltaX);
+            this.$imageWrapper.scrollTop(this.scrollTop + deltaY);
+        }
+    }
+
+    private initialDistance: number = 0;
+    private initialZoom: number = 1;
+
+    private handlePinchZoom(e: JQuery.TriggeredEvent): void {
+        const touches = e.originalEvent?.touches;
+        if (!touches || touches.length !== 2) return;
+
+        if (e.type === 'touchstart') {
+            this.initialDistance = Math.hypot(
+                touches[0].clientX - touches[1].clientX,
+                touches[0].clientY - touches[1].clientY
+            );
+            this.initialZoom = this.currentZoom;
+        } else if (e.type === 'touchmove') {
+            e.preventDefault();
+            
+            const distance = Math.hypot(
+                touches[0].clientX - touches[1].clientX,
+                touches[0].clientY - touches[1].clientY
+            );
+            
+            const scale = distance / this.initialDistance;
+            this.currentZoom = Math.min(Math.max(this.initialZoom * scale, this.config.minZoom), this.config.maxZoom);
+            this.applyZoom();
+        }
+    }
+
+    /**
+     * Setup keyboard navigation with focus check
+     */
+    protected setupKeyboardNavigation(): void {
+        if (!this.$widget?.length) return;
+
+        // Make widget focusable
+        this.$widget.attr('tabindex', '0');
+        this.$widget.attr('role', 'application');
+        this.$widget.attr('aria-label', 'Image viewer with zoom controls');
+        
+        const handleKeyDown = (e: JQuery.KeyDownEvent) => {
+            // Only handle keyboard events when widget has focus
+            if (!this.$widget?.is(':focus-within')) {
+                return;
+            }
+            
+            switch(e.key) {
+                case '+':
+                case '=':
+                    e.preventDefault();
+                    e.stopPropagation();
+                    this.zoomIn();
+                    break;
+                case '-':
+                case '_':
+                    e.preventDefault();
+                    e.stopPropagation();
+                    this.zoomOut();
+                    break;
+                case '0':
+                    e.preventDefault();
+                    e.stopPropagation();
+                    this.resetZoom();
+                    break;
+                case 'Enter':
+                case ' ':
+                    if (this.isPhotoSwipeAvailable && this.$imageView?.length) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        const src = this.$imageView.attr('src') || this.$imageView.prop('src');
+                        if (src) {
+                            this.openInLightbox(src, this.note?.title, this.noteId, this.$imageView.get(0));
+                        }
+                    }
+                    break;
+                case 'Escape':
+                    if (this.isPhotoSwipeAvailable && mediaViewer.isOpen()) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        mediaViewer.close();
+                    }
+                    break;
+                case 'ArrowLeft':
+                    if (this.currentZoom > 1 && this.$imageWrapper) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        this.$imageWrapper.scrollLeft((this.$imageWrapper.scrollLeft() ?? 0) - 50);
+                    }
+                    break;
+                case 'ArrowRight':
+                    if (this.currentZoom > 1 && this.$imageWrapper) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        this.$imageWrapper.scrollLeft((this.$imageWrapper.scrollLeft() ?? 0) + 50);
+                    }
+                    break;
+                case 'ArrowUp':
+                    if (this.currentZoom > 1 && this.$imageWrapper) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        this.$imageWrapper.scrollTop((this.$imageWrapper.scrollTop() ?? 0) - 50);
+                    }
+                    break;
+                case 'ArrowDown':
+                    if (this.currentZoom > 1 && this.$imageWrapper) {
+                        e.preventDefault();
+                        e.stopPropagation();
+                        this.$imageWrapper.scrollTop((this.$imageWrapper.scrollTop() ?? 0) + 50);
+                    }
+                    break;
+            }
+        };
+
+        this.boundHandlers.set('keydown', handleKeyDown);
+        this.$widget.on('keydown', handleKeyDown);
+    }
+
+    /**
+     * Refresh gallery items when content changes
+     */
+    protected async refreshGalleryItems(): Promise<void> {
+        this.galleryItems = await this.detectGalleryItems();
+        this.currentImageIndex = 0;
+    }
+
+    /**
+     * Setup double-click to reset zoom
+     */
+    protected setupDoubleClickReset(): void {
+        if (!this.$imageView?.length) return;
+
+        this.$imageView.on('dblclick', (e) => {
+            e.preventDefault();
+            this.resetZoom();
+        });
+    }
+
+    /**
+     * Setup context menu for image
+     */
+    protected setupContextMenu(): void {
+        if (this.$imageView?.length) {
+            imageContextMenuService.setupContextMenu(this.$imageView);
+        }
+    }
+
+    /**
+     * Add ARIA labels for accessibility
+     */
+    protected addAccessibilityLabels(): void {
+        // Add ARIA labels to control buttons
+        this.$widget?.find('.zoom-in, .image-control-btn.zoom-in')
+            .attr('aria-label', 'Zoom in')
+            .attr('role', 'button');
+        
+        this.$widget?.find('.zoom-out, .image-control-btn.zoom-out')
+            .attr('aria-label', 'Zoom out')
+            .attr('role', 'button');
+        
+        this.$widget?.find('.fullscreen, .image-control-btn.fullscreen')
+            .attr('aria-label', 'Open in fullscreen lightbox')
+            .attr('role', 'button');
+        
+        this.$widget?.find('.download, .image-control-btn.download')
+            .attr('aria-label', 'Download image')
+            .attr('role', 'button');
+        
+        // Add alt text to image
+        if (this.$imageView?.length && this.note?.title) {
+            this.$imageView.attr('alt', this.note.title);
+        }
+    }
+
+    /**
+     * Cleanup all event handlers and resources
+     */
+    cleanup() {
+        // Close gallery or lightbox if open
+        if (this.isPhotoSwipeAvailable) {
+            if (galleryManager.isGalleryOpen()) {
+                galleryManager.closeGallery();
+            } else if (mediaViewer.isOpen()) {
+                mediaViewer.close();
+            }
+        }
+        
+        // Clear gallery items
+        this.galleryItems = [];
+        this.currentImageIndex = 0;
+        
+        // Remove document-level event listeners
+        if (this.boundHandlers.has('mousemove')) {
+            $(document).off('mousemove', this.boundHandlers.get('mousemove') as any);
+        }
+        if (this.boundHandlers.has('mouseup')) {
+            $(document).off('mouseup', this.boundHandlers.get('mouseup') as any);
+        }
+        
+        // Clear all bound handlers
+        this.boundHandlers.clear();
+        
+        // Cancel any pending animations
+        if (this.rafId) {
+            cancelAnimationFrame(this.rafId);
+            this.rafId = null;
+        }
+        
+        // Clear zoom debounce timer
+        if (this.zoomDebounceTimer) {
+            clearTimeout(this.zoomDebounceTimer);
+            this.zoomDebounceTimer = null;
+        }
+        
+        // Clear zoom indicator timer
+        if (this.$zoomIndicator?.data('hideTimer')) {
+            clearTimeout(this.$zoomIndicator.data('hideTimer'));
+        }
+        
+        super.cleanup();
+    }
+}
+
+export default ImageViewerBase;

apps/client/src/widgets/type_widgets/read_only_text.ts

@@ -6,6 +6,7 @@ import { getLocaleById } from "../../services/i18n.js";
 import appContext from "../../components/app_context.js";
 import { getMermaidConfig } from "../../services/mermaid.js";
 import { renderMathInElement } from "../../services/math.js";
+import ckeditorPhotoSwipe from "../../services/ckeditor_photoswipe_integration.js";
 
 const TPL = /*html*/`
 <div class="note-detail-readonly-text note-detail-printable" tabindex="100">
@@ -93,9 +94,21 @@ export default class ReadOnlyTextTypeWidget extends AbstractTextTypeWidget {
     }
 
     cleanup() {
+        // Cleanup PhotoSwipe integration
+        if (this.$content?.[0]) {
+            ckeditorPhotoSwipe.cleanupContainer(this.$content[0]);
+        }
+        
+        // Remove all event handlers from content
+        if (this.$content) {
+            this.$content.off();
+            this.$content.find('*').off();
             this.$content.html("");
         }
         
+        super.cleanup();
+    }
+
     async doRefresh(note: FNote) {
         // we load CKEditor also for read only notes because they contain content styles required for correct rendering of even read only notes
         // we could load just ckeditor-content.css but that causes CSS conflicts when both build CSS and this content CSS is loaded at the same time
@@ -108,6 +121,18 @@ export default class ReadOnlyTextTypeWidget extends AbstractTextTypeWidget {
 
         this.$content.html(blob?.content ?? "");
         
+        // Setup PhotoSwipe integration for images in read-only content
+        setTimeout(() => {
+            if (this.$content[0]) {
+                ckeditorPhotoSwipe.setupContainer(this.$content[0], {
+                    enableGalleryMode: true,
+                    showHints: true,
+                    hintDelay: 2000,
+                    excludeSelector: '.no-lightbox'
+                });
+            }
+        }, 100);
+
         this.$content.find("a.reference-link").each((_, el) => {
             this.loadReferenceLinkTitle($(el));
         });

pnpm-lock.yaml

@@ -282,6 +282,9 @@ importers:
       panzoom:
         specifier: 9.4.3
         version: 9.4.3
+      photoswipe:
+        specifier: ^5.4.4
+        version: 5.4.4
       preact:
         specifier: 10.27.0
         version: 10.27.0
@@ -11730,6 +11733,10 @@ packages:
   perfect-freehand@1.2.0:
     resolution: {integrity: sha512-h/0ikF1M3phW7CwpZ5MMvKnfpHficWoOEyr//KVNTxV4F6deRK1eYMtHyBKEAKFK0aXIEUK9oBvlF6PNXMDsAw==}
 
+  photoswipe@5.4.4:
+    resolution: {integrity: sha512-WNFHoKrkZNnvFFhbHL93WDkW3ifwVOXSW3w1UuZZelSmgXpIGiZSNlZJq37rR8YejqME2rHs9EhH9ZvlvFH2NA==}
+    engines: {node: '>= 0.12.0'}
+
   pica@7.1.1:
     resolution: {integrity: sha512-WY73tMvNzXWEld2LicT9Y260L43isrZ85tPuqRyvtkljSDLmnNFQmZICt4xUJMVulmcc6L9O7jbBrtx3DOz/YQ==}
 
@@ -16850,6 +16857,8 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 46.0.1
       '@ckeditor/ckeditor5-widget': 46.0.1
       es-toolkit: 1.39.5
+    transitivePeerDependencies:
+      - supports-color
 
   '@ckeditor/ckeditor5-cloud-services@46.0.1':
     dependencies:
@@ -16869,6 +16878,8 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
+    transitivePeerDependencies:
+      - supports-color
 
   '@ckeditor/ckeditor5-collaboration-core@46.0.1':
     dependencies:
@@ -17138,8 +17149,6 @@ snapshots:
       '@ckeditor/ckeditor5-table': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-emoji@46.0.1':
     dependencies:
@@ -17196,8 +17205,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-export-word@46.0.1':
     dependencies:
@@ -17222,6 +17229,8 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
       es-toolkit: 1.39.5
+    transitivePeerDependencies:
+      - supports-color
 
   '@ckeditor/ckeditor5-font@46.0.1':
     dependencies:
@@ -17346,8 +17355,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-indent@46.0.1':
     dependencies:
@@ -17420,8 +17427,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-markdown-gfm@46.0.1':
     dependencies:
@@ -17459,8 +17464,6 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 46.0.1
       '@ckeditor/ckeditor5-widget': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-mention@46.0.1(patch_hash=5981fb59ba35829e4dff1d39cf771000f8a8fdfa7a34b51d8af9549541f2d62d)':
     dependencies:
@@ -17484,8 +17487,6 @@ snapshots:
       '@ckeditor/ckeditor5-widget': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
       es-toolkit: 1.39.5
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-minimap@46.0.1':
     dependencies:
@@ -17494,8 +17495,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-operations-compressor@46.0.1':
     dependencies:
@@ -17548,8 +17547,6 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 46.0.1
       '@ckeditor/ckeditor5-widget': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-pagination@46.0.1':
     dependencies:
@@ -17576,8 +17573,6 @@ snapshots:
       '@ckeditor/ckeditor5-paste-from-office': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-paste-from-office@46.0.1':
     dependencies:
@@ -17585,8 +17580,6 @@ snapshots:
       '@ckeditor/ckeditor5-core': 46.0.1
       '@ckeditor/ckeditor5-engine': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-real-time-collaboration@46.0.1(bufferutil@4.0.9)(utf-8-validate@6.0.5)':
     dependencies:
@@ -17617,8 +17610,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-restricted-editing@46.0.1':
     dependencies:
@@ -17628,8 +17619,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-revision-history@46.0.1':
     dependencies:
@@ -17664,8 +17653,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-slash-command@46.0.1':
     dependencies:
@@ -17678,8 +17665,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-source-editing-enhanced@46.0.1':
     dependencies:
@@ -17706,8 +17691,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-special-characters@46.0.1':
     dependencies:
@@ -17717,8 +17700,6 @@ snapshots:
       '@ckeditor/ckeditor5-ui': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-style@46.0.1':
     dependencies:
@@ -17731,8 +17712,6 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
       es-toolkit: 1.39.5
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-table@46.0.1':
     dependencies:
@@ -17745,8 +17724,6 @@ snapshots:
       '@ckeditor/ckeditor5-widget': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
       es-toolkit: 1.39.5
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-template@46.0.1':
     dependencies:
@@ -17857,8 +17834,6 @@ snapshots:
       '@ckeditor/ckeditor5-engine': 46.0.1
       '@ckeditor/ckeditor5-utils': 46.0.1
       es-toolkit: 1.39.5
-    transitivePeerDependencies:
-      - supports-color
 
   '@ckeditor/ckeditor5-widget@46.0.1':
     dependencies:
@@ -17878,8 +17853,6 @@ snapshots:
       '@ckeditor/ckeditor5-utils': 46.0.1
       ckeditor5: 46.0.1(patch_hash=8331a09d41443b39ea1c784daaccfeb0da4f9065ed556e7de92e9c77edd9eb41)
       es-toolkit: 1.39.5
-    transitivePeerDependencies:
-      - supports-color
 
   '@codemirror/autocomplete@6.18.6':
     dependencies:
@@ -29514,6 +29487,8 @@ snapshots:
 
   perfect-freehand@1.2.0: {}
 
+  photoswipe@5.4.4: {}
+
   pica@7.1.1:
     dependencies:
       glur: 1.1.2