fix: expand home hub previews

close #1268

test/screens/discover_screen_test.dart

@@ -241,7 +241,8 @@ class _FakeMediaServerClient implements MediaServerClient {
   Future<List<MediaItem>> fetchContinueWatching({int? count = 20}) async => const [];
 
   @override
-  Future<List<MediaHub>> fetchGlobalHubs({int limit = 10, bool includePlaybackHubs = true}) async => hubs;
+  Future<List<MediaHub>> fetchGlobalHubs({int limit = defaultHubPreviewLimit, bool includePlaybackHubs = true}) async =>
+      hubs;
 
   @override
   dynamic noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);

test/services/data_aggregation_bridge_test.dart

@@ -7,6 +7,7 @@ import 'package:http/http.dart' as http;
 import 'package:http/testing.dart';
 import 'package:plezy/connection/connection.dart';
 import 'package:plezy/database/app_database.dart';
+import 'package:plezy/media/media_server_client.dart';
 import 'package:plezy/models/plex/plex_config.dart';
 import 'package:plezy/services/data_aggregation_service.dart';
 import 'package:plezy/services/jellyfin_client.dart';
@@ -366,6 +367,10 @@ void main() {
         captured.where((uri) => uri.path == '/Users/user-1/Items/Latest').map((uri) => uri.queryParameters['ParentId']),
         ['lib-1', 'lib-2', 'lib-3', 'lib-4'],
       );
+      expect(
+        captured.where((uri) => uri.path == '/Users/user-1/Items/Latest').map((uri) => uri.queryParameters['Limit']),
+        everyElement(defaultHubPreviewLimit.toString()),
+      );
     });
 
     test('global home layout falls back to per-library hubs for Jellyfin', () async {
@@ -414,6 +419,10 @@ void main() {
         captured.where((uri) => uri.path == '/Users/user-1/Items/Latest').map((uri) => uri.queryParameters['ParentId']),
         ['movies', 'shows'],
       );
+      expect(
+        captured.where((uri) => uri.path == '/Users/user-1/Items/Latest').map((uri) => uri.queryParameters['Limit']),
+        everyElement(defaultHubPreviewLimit.toString()),
+      );
     });
 
     test('Plex home layout keeps promoted hubs instead of splitting by preview libraries', () async {
@@ -472,6 +481,7 @@ void main() {
       expect(hubs.single.libraryId, isNull);
       expect(hubs.single.items, hasLength(7));
       expect(captured.map((uri) => uri.path), ['/hubs/promoted']);
+      expect(captured.single.queryParameters['count'], defaultHubPreviewLimit.toString());
     });
   });
 }

test/services/jellyfin_client_urls_test.dart

@@ -8,6 +8,7 @@ import 'package:plezy/media/library_query.dart';
 import 'package:plezy/media/media_backend.dart';
 import 'package:plezy/media/media_item.dart';
 import 'package:plezy/media/media_kind.dart';
+import 'package:plezy/media/media_server_client.dart';
 import 'package:plezy/models/transcode_quality_preset.dart';
 import 'package:plezy/services/jellyfin_client.dart';
 import 'package:plezy/services/playback_initialization_types.dart';
@@ -2163,6 +2164,30 @@ void main() {
 
     Uri capturedNextUpRequest() => captured.singleWhere((uri) => uri.path == '/Shows/NextUp');
 
+    test('global preview defaults to shared limit and marks filled previews as more', () async {
+      captured = [];
+      final mock = MockClient((req) async {
+        captured.add(req.url);
+        return http.Response(
+          jsonEncode({
+            'Items': [
+              for (var i = 0; i < defaultHubPreviewLimit; i++) {'Id': 'movie-$i', 'Type': 'Movie', 'Name': 'Movie $i'},
+            ],
+          }),
+          200,
+          headers: {'content-type': 'application/json'},
+        );
+      });
+      final client = JellyfinClient.forTesting(connection: _conn(), httpClient: mock);
+      addTearDown(client.close);
+
+      final hubs = await client.fetchGlobalHubs(includePlaybackHubs: false);
+
+      expect(captured.single.queryParameters['Limit'], defaultHubPreviewLimit.toString());
+      expect(hubs.single.items, hasLength(defaultHubPreviewLimit));
+      expect(hubs.single.more, isTrue);
+    });
+
     test('global Next Up excludes resumable episodes without date cutoff', () async {
       final client = buildClient();
       addTearDown(client.close);