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/requests/requests_screen.dart

@@ -3,6 +3,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:go_router/go_router.dart';
 
 import '../models/admin_request.dart';
+import '../shared/live_events_provider.dart';
 import '../shared/widgets/main_app_bar_actions.dart';
 import '../theme/theme_extension.dart';
 import 'requests_provider.dart';
@@ -13,6 +14,16 @@ class RequestsScreen extends ConsumerWidget {
   @override
   Widget build(BuildContext context, WidgetRef ref) {
     final fs = Theme.of(context).extension<FabledSwordTheme>()!;
+    // #402 wire-up: refresh the user's own requests list on
+    // request.status_changed. Server-side events are user-scoped
+    // (admin actions on someone else's request route to that other
+    // user's stream); the dispatcher's filter already drops mismatches.
+    ref.listen<AsyncValue<LiveEvent>>(liveEventsProvider, (_, next) {
+      final e = next.asData?.value;
+      if (e?.kind == 'request.status_changed') {
+        ref.invalidate(myRequestsProvider);
+      }
+    });
     final requests = ref.watch(myRequestsProvider);
 
     return Scaffold(