fix: remove deleted local library item from provider state after file deletion

When deleting a non-CUE local library track from the metadata screen,
only the file was removed but the library database entry and provider
state were left untouched, causing the track to persist in the library UI.
Now calls removeItem() on localLibraryProvider after deleteFile().

lib/screens/track_metadata_screen.dart

@@ -3851,6 +3851,11 @@ class _TrackMetadataScreenState extends ConsumerState<TrackMetadataScreen> {
                   } catch (e) {
                     debugPrint('Failed to delete file: $e');
                   }
+                  if (_localLibraryItem != null) {
+                    await ref
+                        .read(localLibraryProvider.notifier)
+                        .removeItem(_localLibraryItem!.id);
+                  }
                 }
               } else {
                 try {