feat(theme): start implementing a theme for TriliumNext

src/public/app/widgets/type_widgets/options/appearance/theme.js

@@ -41,8 +41,9 @@ export default class ThemeOptions extends OptionsWidget {
 
     async optionsLoaded(options) {
         const themes = [
+            { val: 'next', title: t("theme.triliumnext") },
             { val: 'light', title: t('theme.light_theme') },
-            { val: 'dark', title: t('theme.dark_theme') }
+            { val: 'dark', title: t('theme.dark_theme') }            
         ].concat(await server.get('options/user-themes'));
 
         this.$themeSelect.empty();

src/public/translations/en/translation.json

@@ -1061,7 +1061,8 @@
     "theme_label": "Theme",
     "override_theme_fonts_label": "Override theme fonts",
     "light_theme": "Light",
-    "dark_theme": "Dark"
+    "dark_theme": "Dark",
+    "triliumnext": "TriliumNext"
   },
   "zoom_factor": {
     "title": "Zoom Factor (desktop build only)",

src/routes/index.ts

@@ -54,6 +54,8 @@ function getThemeCssUrl(theme: string) {
         return false; // light theme is always loaded as baseline
     } else if (theme === 'dark') {
         return `${assetPath}/stylesheets/theme-dark.css`;
+    } else if (theme === "next") {
+        return `${assetPath}/stylesheets/theme-next.css`;
     } else {
         const themeNote = attributeService.getNoteWithLabel('appTheme', theme);