fix: await hidden libraries init before loading content

lib/screens/discover_screen.dart

@@ -463,6 +463,7 @@ class _DiscoverScreenState extends State<DiscoverScreen>
 
       // Get hidden libraries for filtering
       final hiddenLibrariesProvider = Provider.of<HiddenLibrariesProvider>(context, listen: false);
+      await hiddenLibrariesProvider.ensureInitialized();
       _lastSeenHiddenKeys = Set.of(hiddenLibrariesProvider.hiddenLibraryKeys);
 
       // Get settings for hub mode preference (ensure initialized before accessing)

lib/screens/libraries/libraries_screen.dart

@@ -142,6 +142,7 @@ class _LibrariesScreenState extends State<LibrariesScreen>
   Future<void> _initializeWithLibraries() async {
     final librariesProvider = context.read<LibrariesProvider>();
     final hiddenLibrariesProvider = context.read<HiddenLibrariesProvider>();
+    await hiddenLibrariesProvider.ensureInitialized();
     final allLibraries = librariesProvider.libraries;
 
     if (allLibraries.isEmpty) {