fix(jellyfin): hide unsupported continue watching removal

close #995

test/services/jellyfin_client_urls_test.dart

@@ -399,7 +399,6 @@ void main() {
       await scoped.fetchClientSideEpisodeQueue('folder/show #1?x');
       await scoped.markWatched(item);
       await scoped.markUnwatched(item);
-      await scoped.removeFromContinueWatching(item);
       await scoped.rate(item, 7);
       await scoped.rate(item, -1);
 
@@ -408,10 +407,26 @@ void main() {
       expect(paths, contains('/Shows/folder%2Fshow%20%231%3Fx/Episodes'));
       expect(paths, contains('/UserPlayedItems/folder%2Fitem%20%231%3Fx'));
       expect(paths.where((p) => p == '/UserPlayedItems/folder%2Fitem%20%231%3Fx'), hasLength(2));
-      expect(paths, contains('/UserItems/folder%2Fitem%20%231%3Fx/HideFromResume'));
       expect(paths.where((p) => p == '/UserItems/folder%2Fitem%20%231%3Fx/Rating'), hasLength(2));
     });
 
+    test('removeFromContinueWatching is unsupported for Jellyfin and does not call the server', () async {
+      var requested = false;
+      final scoped = JellyfinClient.forTesting(
+        connection: _conn(),
+        httpClient: MockClient((request) async {
+          requested = true;
+          return http.Response('', 500);
+        }),
+      );
+      addTearDown(scoped.close);
+
+      final item = MediaItem(id: 'item-1', backend: MediaBackend.jellyfin, kind: MediaKind.movie, serverId: 'srv-1');
+
+      await expectLater(scoped.removeFromContinueWatching(item), throwsA(isA<UnsupportedError>()));
+      expect(requested, isFalse);
+    });
+
     test('getPlaybackInitialization URL-encodes appended api_key', () async {
       final scoped = JellyfinClient.forTesting(
         connection: _conn(accessToken: 'tok+with spaces/?&'),