Add likes, follows and playlist visibility; redesign web-player UI

Backend:
- New Likes feature (toggle/get liked tracks) and endpoints
- User follow/unfollow, listening stats, public user profile
- Playlist visibility (public/private) support
- Various auth and DTO/response adjustments to support the above

Frontend (web-player):
- New design system pass: theme tokens/mode (light/dark), glass menu,
  tabs bar, player dock/extras/queue components, mix tiles, artist link
- New routes: Liked, public user profile (/u/[id]), likes API proxy
- Search refactor: shared SearchBox component used by TopBar and
  MobileHeader (search now reachable on mobile), live results as you
  type instead of requiring Enter, dropped the "Buscando…" quick-result
  preview
- Removed now-unused components (MobileNav, CoverBadge, MixBentoTile,
  PlayPauseOverlay, SuggestionsTable, userDirectory)
- Design handoff reference docs added under web-player/design_handoff_musify_player
  and web-player/docs/design-system-refactor-plan.md

.claude/launch.json

@@ -4,14 +4,21 @@
 		{
 			"name": "musify-web",
 			"runtimeExecutable": "npm",
-			"runtimeArgs": ["--prefix", "web-player", "run", "dev", "--", "--port", "3000"],
-			"port": 3000
+			"runtimeArgs": ["--prefix", "web-player", "run", "dev"],
+			"port": 3000,
+			"autoPort": true
 		},
 		{
 			"name": "musify-api",
 			"runtimeExecutable": "dotnet",
 			"runtimeArgs": ["run", "--project", "backend/Hosts/Musify.Api"],
 			"port": 5111
+		},
+		{
+			"name": "musify-streaming-gateway",
+			"runtimeExecutable": "dotnet",
+			"runtimeArgs": ["run", "--project", "backend/Hosts/Musify.StreamingGateway"],
+			"port": 8081
 		}
 	]
 }