feat(react/floating_buttons): port in-app help button

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

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import { byBookType, byNoteType } from "./in_app_help.js";
+import fs from "fs";
+import type { HiddenSubtreeItem } from "@triliumnext/commons";
+import path from "path";
+
+describe("Help button", () => {
+    it("All help notes are accessible", () => {
+        function getNoteIds(item: HiddenSubtreeItem | HiddenSubtreeItem[]): string[] {
+            const items: (string | string[])[] = [];
+
+            if ("id" in item && item.id) {
+                items.push(item.id);
+            }
+
+            const subitems = (Array.isArray(item) ? item : item.children);
+            for (const child of subitems ?? []) {
+                items.push(getNoteIds(child as (HiddenSubtreeItem | HiddenSubtreeItem[])));
+            }
+            return items.flat();
+        }
+
+        const allHelpNotes = [
+            ...Object.values(byNoteType),
+            ...Object.values(byBookType)
+        ].filter((noteId) => noteId) as string[];
+
+        const metaPath = path.resolve(path.join(__dirname, "../../../server/src/assets/doc_notes/en/User Guide/!!!meta.json"));
+        const meta: HiddenSubtreeItem[] = JSON.parse(fs.readFileSync(metaPath, "utf-8"));
+        const allNoteIds = new Set(getNoteIds(meta));
+
+        for (const helpNote of allHelpNotes) {
+            if (!allNoteIds.has(`_help_${helpNote}`)) {
+                expect.fail(`Help note with ID ${helpNote} does not exist in the in-app help.`);
+            }
+        }
+    });
+});