music: /music route + nav dock item (Spotify-style page, v1)

A full-page music browser reusing the app-wide player + dock. Sidebar lists
libraries (1st level of ~/Music); main is a card-grid folder browse with rich
pages: albums show a header + tracklist, and artist folders render their album
cards grouped into discography sections (Studio Albums / Live / Compilation / …)
using /music/discography. Cards have hover-play; everything feeds useMusicPlayer.
Adds a green Music dock item (/music) to the default dock.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/apps/officer-web/Screens/Dashboard/index.tsx

@@ -10,6 +10,7 @@ export * from './TaskLogs';
 export * from './Tasks';
 
 export * from './Files';
+export * from './Music';
 export * from './CodeEditor';
 export * from './ChatHistory';
 export * from './Dashboards';