feat(#402): wire screen-scoped providers to liveEventsProvider

#392's dispatcher only invalidates publicly-importable providers
(myQuarantine + home). Screen-scoped providers (file-private in their
feature folders) get their own ref.listen(liveEventsProvider, ...) so
they go live without needing back-edge dependencies from /shared.

Five screens wired:

- library_screen.dart _LikedTab — invalidates _likedTracksProvider /
  _likedAlbumsProvider / _likedArtistsProvider on any of the six
  track/album/artist like/unlike kinds.

- playlist_detail_screen.dart — invalidates playlistDetailProvider(id)
  on playlist.updated / playlist.tracks_changed matching the visible
  playlist_id. On playlist.deleted matching the visible id, pops back
  so the user isn't left staring at a gone playlist.

- admin_requests_screen.dart — invalidates adminRequestsProvider on
  request.status_changed (covers user create/cancel + admin
  approve/reject + reconciler complete).

- admin_quarantine_screen.dart — invalidates adminQuarantineProvider
  on any quarantine.* event (flag from a user / admin resolve / file
  delete / lidarr delete).

- requests_screen.dart (own requests) — invalidates myRequestsProvider
  on request.status_changed. Server-side events are user-scoped via
  publishRequestStatusChanged's row.UserID, so admin actions on
  someone else's request route to the right stream.

History tab is NOT wired (no server-side play.scrobbled event yet —
documented in #402 body as deferred until that event ships).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

flutter_client/lib/library/library_screen.dart

@@ -17,6 +17,7 @@ import '../models/quarantine_mine.dart';
 import '../models/track.dart';
 import '../player/player_provider.dart';
 import '../quarantine/quarantine_provider.dart';
+import '../shared/live_events_provider.dart';
 import '../shared/widgets/main_app_bar_actions.dart';
 import '../shared/widgets/server_image.dart';
 import '../theme/theme_extension.dart';
@@ -375,6 +376,25 @@ class _LikedTab extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final fs = Theme.of(context).extension<FabledSwordTheme>()!;
+    // #402 wire-up: when any like/unlike event arrives via SSE,
+    // invalidate all three Liked sub-lists. Server-side events are
+    // already user-scoped (publishLikeEvent attaches user_id), so the
+    // dispatcher filters out other users' events upstream.
+    ref.listen<AsyncValue<LiveEvent>>(liveEventsProvider, (_, next) {
+      final e = next.asData?.value;
+      if (e == null) return;
+      switch (e.kind) {
+        case 'track.liked':
+        case 'track.unliked':
+        case 'album.liked':
+        case 'album.unliked':
+        case 'artist.liked':
+        case 'artist.unliked':
+          ref.invalidate(_likedTracksProvider);
+          ref.invalidate(_likedAlbumsProvider);
+          ref.invalidate(_likedArtistsProvider);
+      }
+    });
     final tracksA = ref.watch(_likedTracksProvider);
     final albumsA = ref.watch(_likedAlbumsProvider);
     final artistsA = ref.watch(_likedArtistsProvider);