fix: exclude mal/anilist/simkl session keys from settings export

lib/services/settings_export_service.dart

@@ -80,10 +80,18 @@ class SettingsExportService {
   };
 
   /// Prefix denylist. A key is excluded if it starts with any of these.
-  /// `trakt_` covers OAuth session tokens and the runtime sync queue — the
-  /// `enable_trakt_*` feature toggles don't match this prefix and stay
-  /// exportable.
-  static const List<String> _denyPrefixes = ['server_endpoint_', 'episode_count_', 'watched_threshold_', 'trakt_'];
+  /// The tracker prefixes (`trakt_`, `mal_`, `anilist_`, `simkl_`) cover
+  /// OAuth session tokens and runtime sync queues. The `enable_*` feature
+  /// toggles use a different prefix and stay exportable.
+  static const List<String> _denyPrefixes = [
+    'server_endpoint_',
+    'episode_count_',
+    'watched_threshold_',
+    'trakt_',
+    'mal_',
+    'anilist_',
+    'simkl_',
+  ];
 
   /// Literal prefix used by [StorageService._userPrefix] for any scoped key.
   static const String _userPrefixRoot = 'user_';

test/services/settings_export_service_test.dart

@@ -114,6 +114,48 @@ void main() {
       expect(p, contains('enable_trakt_scrobble'));
     });
 
+    test('drops MAL / AniList / SIMKL session keys but keeps their feature toggles', () async {
+      final prefs = await BaseSharedPreferencesService.sharedCache();
+      // Stripped tracker session tokens — these would carry access_token /
+      // refresh_token JSON if they leaked into the export.
+      await prefs.setString('mal_session', '{"access_token":"a","refresh_token":"r"}');
+      await prefs.setString('anilist_session', '{"access_token":"a"}');
+      await prefs.setString('simkl_session', '{"access_token":"a"}');
+      // Feature toggles use the `enable_` prefix and SHOULD survive.
+      await prefs.setBool('enable_mal_scrobble', true);
+      await prefs.setBool('enable_anilist_scrobble', true);
+      await prefs.setBool('enable_simkl_scrobble', true);
+
+      final out = SettingsExportService.buildExportMap(prefs);
+      final p = out['prefs'] as Map<String, dynamic>;
+
+      expect(p, isNot(contains('mal_session')));
+      expect(p, isNot(contains('anilist_session')));
+      expect(p, isNot(contains('simkl_session')));
+      expect(p, contains('enable_mal_scrobble'));
+      expect(p, contains('enable_anilist_scrobble'));
+      expect(p, contains('enable_simkl_scrobble'));
+    });
+
+    test('user-scoped tracker sessions are dropped after the user prefix is stripped', () async {
+      final prefs = await BaseSharedPreferencesService.sharedCache();
+      // TrackerAccountStore writes under user_{uuid}_{baseKey}. After the
+      // active-user prefix is stripped on export, the key falls under the
+      // tracker prefix denylist.
+      await prefs.setString('user_alice_mal_session', '{"access_token":"a"}');
+      await prefs.setString('user_alice_anilist_session', '{"access_token":"a"}');
+      await prefs.setString('user_alice_simkl_session', '{"access_token":"a"}');
+      await prefs.setString('user_alice_trakt_session', '{"access_token":"a"}');
+
+      final out = SettingsExportService.buildExportMap(prefs, currentUserUuid: 'alice');
+      final p = out['prefs'] as Map<String, dynamic>;
+
+      expect(p, isNot(contains('mal_session')));
+      expect(p, isNot(contains('anilist_session')));
+      expect(p, isNot(contains('simkl_session')));
+      expect(p, isNot(contains('trakt_session')));
+    });
+
     test('drops the internal migration flag', () async {
       final prefs = await BaseSharedPreferencesService.sharedCache();
       await prefs.setBool('buffer_size_migrated_to_auto', true);