fix(flutter): analyze errors after Plan C provider migrations

- cache_first.dart: backtick-fence List<T> doc comment to dodge
  unintended_html_in_doc_comment.
- library_providers.dart:163: switch single-row insert to
  insertAllOnConflictUpdate; Batch only exposes the *AllOnConflict*
  variant.
- 5 test files: StreamProvider.overrideWith takes Create<Stream<T>>,
  not Create<Future<T>>. Wrap data emissions in Stream.value(...).
- artist_detail_screen_test: add models/album.dart import for AlbumRef
  type annotation.
- track_actions_sheet_test: drop _StubLiked extends LikedIdsController
  (notifier no longer exists post-migration); override with
  Stream.value(LikedIds(...)) instead.
- like_button_test: rollback assertion now requires drift writes via
  LikesController. Skip under _skipDrift until libsqlite3-dev lands on
  the runner image (Fable #399). Replace stale .notifier reference
  with likesControllerProvider for completeness.

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

flutter_client/lib/library/library_providers.dart

@@ -160,7 +160,7 @@ final albumProvider = StreamProvider.family<
           final api = await ref.read(libraryApiProvider.future);
           final fresh = await api.getAlbum(albumId);
           await db.batch((b) {
-            b.insertOnConflictUpdate(db.cachedAlbums, fresh.album.toDrift());
+            b.insertAllOnConflictUpdate(db.cachedAlbums, [fresh.album.toDrift()]);
             b.insertAllOnConflictUpdate(db.cachedTracks,
                 fresh.tracks.map((t) => t.toDrift()).toList());
           });