fix: filter hub detail view by library section

close #638

lib/models/plex_hub.dart

@@ -15,6 +15,10 @@ class PlexHub {
   final String? serverId; // Server machine identifier
   final String? serverName; // Server display name
 
+  /// When set, this hub was split from a multi-library hub and should only
+  /// show items belonging to this library section.
+  final int? librarySectionID;
+
   PlexHub({
     required this.hubKey,
     required this.title,
@@ -25,6 +29,7 @@ class PlexHub {
     required this.items,
     this.serverId,
     this.serverName,
+    this.librarySectionID,
   });
 
   factory PlexHub.fromJson(Map<String, dynamic> json) {

lib/screens/hub_detail_screen.dart

@@ -240,7 +240,13 @@ class _HubDetailScreenState extends State<HubDetailScreen>
       final client = _getClientForHub();
 
       // Fetch items from the hub, tagged with server info at the source
-      final items = await client.getHubContent(widget.hub.hubKey);
+      var items = await client.getHubContent(widget.hub.hubKey);
+
+      // Filter to specific library if this hub was split from a multi-library hub
+      final sectionFilter = widget.hub.librarySectionID;
+      if (sectionFilter != null) {
+        items = items.where((item) => item.librarySectionID == sectionFilter).toList();
+      }
 
       if (!mounted) return;
       setState(() {

lib/services/data_aggregation_service.dart

@@ -350,6 +350,7 @@ class DataAggregationService {
           items: items,
           serverId: hub.serverId,
           serverName: hub.serverName,
+          librarySectionID: entry.key,
         ));
       }