feat: redesign dashboard with Tracearr-inspired layout and improve language detection

static/manifest.json

@@ -9,8 +9,8 @@
   "display": "standalone",
   "display_override": ["window-controls-overlay", "standalone"],
   "prefer_related_applications": false,
-  "background_color": "#151619",
-  "theme_color": "#1f252d",
+  "background_color": "#0c0d0f",
+  "theme_color": "#101113",
   "orientation": "any",
   "icons": [
     {"src": "/static/media-mark-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any"},