feat: per-tracker library whitelist/blacklist

close #917

lib/services/trackers/anilist/anilist_tracker.dart

@@ -2,6 +2,7 @@ import '../../../models/trackers/tracker_context.dart';
 import '../../../utils/app_logger.dart';
 import '../../settings_service.dart';
 import '../tracker.dart';
+import '../tracker_constants.dart';
 import 'anilist_client.dart';
 import 'anilist_session.dart';
 
@@ -17,6 +18,9 @@ class AnilistTracker extends TrackerBase {
   @override
   String get name => 'anilist';
 
+  @override
+  TrackerService get service => TrackerService.anilist;
+
   @override
   bool get needsFribb => true;
 

lib/services/trackers/mal/mal_tracker.dart

@@ -2,6 +2,7 @@ import '../../../models/trackers/tracker_context.dart';
 import '../../../utils/app_logger.dart';
 import '../../settings_service.dart';
 import '../tracker.dart';
+import '../tracker_constants.dart';
 import 'mal_client.dart';
 import 'mal_session.dart';
 
@@ -22,6 +23,9 @@ class MalTracker extends TrackerBase {
   @override
   String get name => 'mal';
 
+  @override
+  TrackerService get service => TrackerService.mal;
+
   @override
   bool get needsFribb => true;
 

lib/services/trackers/simkl/simkl_tracker.dart

@@ -2,6 +2,7 @@ import '../../../models/trackers/tracker_context.dart';
 import '../../../utils/app_logger.dart';
 import '../../settings_service.dart';
 import '../tracker.dart';
+import '../tracker_constants.dart';
 import 'simkl_client.dart';
 import 'simkl_session.dart';
 
@@ -20,6 +21,9 @@ class SimklTracker extends TrackerBase {
   @override
   String get name => 'simkl';
 
+  @override
+  TrackerService get service => TrackerService.simkl;
+
   @override
   bool get needsFribb => false;
 

lib/services/trackers/tracker.dart

@@ -1,5 +1,6 @@
 import '../../models/trackers/tracker_context.dart';
 import '../settings_service.dart';
+import 'tracker_constants.dart';
 
 /// Abstract tracker contract: the coordinator calls [markWatched] once per
 /// playback when progress crosses the watched threshold. Enabled/auth gating
@@ -7,6 +8,10 @@ import '../settings_service.dart';
 abstract class Tracker {
   String get name;
 
+  /// Stable identifier used to persist per-service settings (library filter,
+  /// scrobble enabled, etc.).
+  TrackerService get service;
+
   bool get canScrobble;
 
   /// True if this tracker's IDs only come from the Fribb anime mapping
@@ -18,6 +23,12 @@ abstract class Tracker {
   Future<void> initialize();
   Future<void> setEnabled(bool enabled);
 
+  /// Whether an item in the given library should be scrobbled. Applies the
+  /// per-tracker whitelist/blacklist — callers pass the Plex library
+  /// `serverId:sectionId` globalKey (null when unknown, in which case the
+  /// filter is bypassed so we err on the side of syncing).
+  bool shouldScrobbleForLibrary(String? libraryGlobalKey);
+
   Future<void> markWatched(TrackerContext ctx);
 }
 
@@ -45,4 +56,8 @@ abstract class TrackerBase implements Tracker {
   Future<void> setEnabled(bool enabled) async {
     _isEnabled = enabled;
   }
+
+  @override
+  bool shouldScrobbleForLibrary(String? libraryGlobalKey) =>
+      SettingsService.instanceOrNull?.isLibraryAllowedForTracker(service, libraryGlobalKey) ?? true;
 }

lib/services/trackers/tracker_constants.dart

@@ -6,3 +6,11 @@ class TrackerConstants {
   /// pushed to each tracker.
   static const double watchedThresholdPercent = 80.0;
 }
+
+/// Identifier used across the app to disambiguate per-service operations.
+/// The enum's `.name` forms part of the persistence key — do not rename
+/// without a migration.
+enum TrackerService { mal, anilist, simkl, trakt }
+
+/// Blacklist+[] syncs every library (the default); whitelist+[] syncs nothing.
+enum TrackerLibraryFilterMode { blacklist, whitelist }

lib/services/trackers/tracker_coordinator.dart

@@ -113,7 +113,9 @@ class TrackerCoordinator {
   }
 
   Future<void> _dispatchMarkWatched(TrackerContext ctx) async {
-    final active = _trackers.where((t) => t.canScrobble);
+    final active = _trackers.where(
+      (t) => t.canScrobble && t.shouldScrobbleForLibrary(ctx.libraryGlobalKey),
+    );
     await Future.wait(active.map((t) async {
       try {
         await t.markWatched(ctx);
@@ -127,6 +129,8 @@ class TrackerCoordinator {
     final resolver = _resolver;
     if (resolver == null) return null;
 
+    final libraryKey = metadata.librarySectionGlobalKey;
+
     if (metadata.mediaType == PlexMediaType.movie) {
       final ids = await resolver.resolveForMovie(metadata.ratingKey);
       if (ids == null) return null;
@@ -134,6 +138,7 @@ class TrackerCoordinator {
         external: ids.external,
         anime: ids.anime,
         ratingKey: metadata.ratingKey,
+        libraryGlobalKey: libraryKey,
       );
     }
 
@@ -147,6 +152,7 @@ class TrackerCoordinator {
       external: ids.external,
       anime: ids.anime,
       ratingKey: metadata.ratingKey,
+      libraryGlobalKey: libraryKey,
       season: season,
       episodeNumber: number,
     );