fix(libraries): restore tvOS empty tab focus

close #1330

lib/screens/libraries/libraries_screen.dart

@@ -251,7 +251,7 @@ class _LibrariesScreenState extends State<LibrariesScreen>
 
       final tabState = _getTabState(tabController.index);
       if (tabState != null) {
-        (tabState as dynamic).focusFirstItem();
+        (tabState as dynamic).focusContentOrChrome();
       } else {
         // State not available yet, retry after another frame
         WidgetsBinding.instance.addPostFrameCallback((_) {
@@ -266,7 +266,7 @@ class _LibrariesScreenState extends State<LibrariesScreen>
   void _focusCurrentTabImmediate() {
     final tabState = _getTabState(tabController.index);
     if (tabState != null) {
-      (tabState as dynamic).focusFirstItem();
+      (tabState as dynamic).focusContentOrChrome();
     }
   }
 
@@ -296,7 +296,7 @@ class _LibrariesScreenState extends State<LibrariesScreen>
         if (_visibleTabs[tabController.index] == LibraryTabType.browse) {
           (tabState as dynamic).focusChipsBar();
         } else {
-          (tabState as dynamic).focusFirstItem();
+          (tabState as dynamic).focusContentOrChrome();
         }
       }
     });

lib/screens/libraries/tabs/base_library_tab.dart

@@ -79,6 +79,7 @@ abstract class BaseLibraryTabState<T, W extends BaseLibraryTab<T>> extends State
   bool _hasLoadedData = false;
   @protected
   bool hasFocused = false;
+  bool _hasFocusedChromeFallback = false;
 
   // Getters for subclasses
   List<T> get items => _items;
@@ -125,6 +126,7 @@ abstract class BaseLibraryTabState<T, W extends BaseLibraryTab<T>> extends State
     if (oldWidget.library.globalKey != widget.library.globalKey) {
       // Reset focus state for new library
       hasFocused = false;
+      _hasFocusedChromeFallback = false;
       _hasLoadedData = false;
       // Immediately clear stale data before async load
       _items = [];
@@ -169,14 +171,47 @@ abstract class BaseLibraryTabState<T, W extends BaseLibraryTab<T>> extends State
     // from interfering with TabBarView page animations
     if (!InputModeTracker.isKeyboardMode(context)) return;
 
-    if (widget.isActive && _hasLoadedData && !hasFocused && _items.isNotEmpty) {
+    if (!widget.isActive || !_hasLoadedData) return;
+
+    if (hasFocusableContent) {
+      _hasFocusedChromeFallback = false;
+      if (hasFocused) return;
       hasFocused = true;
       WidgetsBinding.instance.addPostFrameCallback((_) {
         if (mounted) {
           focusFirstItem();
         }
       });
+      return;
     }
+
+    if (!_hasFocusedChromeFallback) {
+      _hasFocusedChromeFallback = true;
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (mounted) {
+          focusEmptyState();
+        }
+      });
+    }
+  }
+
+  /// Whether [focusFirstItem] has a real content target to focus.
+  @protected
+  bool get hasFocusableContent => _items.isNotEmpty;
+
+  /// Focus content when available, otherwise return to the library chrome.
+  void focusContentOrChrome() {
+    if (hasFocusableContent) {
+      focusFirstItem();
+    } else {
+      focusEmptyState();
+    }
+  }
+
+  /// Fallback for empty/error states, where content has no focusable child.
+  @protected
+  void focusEmptyState() {
+    widget.onBack?.call();
   }
 
   /// Focus the first item in the tab. Subclasses should override this.

lib/screens/libraries/tabs/library_browse_tab.dart

@@ -357,10 +357,10 @@ class _LibraryBrowseTabState extends BaseLibraryTabState<MediaItem, LibraryBrows
     // On mobile (touch mode), skip auto-focus to prevent ensureVisible()
     // from interfering with TabBarView page animations
     if (!InputModeTracker.isKeyboardMode(context)) return;
-    if (widget.isActive && hasLoadedData && !hasFocused && loadedItems.isNotEmpty) {
+    if (widget.isActive && hasLoadedData && !hasFocused) {
       hasFocused = true;
       WidgetsBinding.instance.addPostFrameCallback((_) {
-        if (mounted) focusFirstItem();
+        if (mounted) focusContentOrChrome();
       });
     }
   }
@@ -423,6 +423,18 @@ class _LibraryBrowseTabState extends BaseLibraryTabState<MediaItem, LibraryBrows
     }
   }
 
+  @override
+  bool get hasFocusableContent => _selectedGrouping == 'folders' || loadedItems.isNotEmpty;
+
+  @override
+  void focusContentOrChrome() {
+    if (hasFocusableContent) {
+      focusFirstItem();
+    } else {
+      focusChipsBar();
+    }
+  }
+
   /// Height of the chips bar (padding + chip + padding)
   static const double _chipsBarHeight = 32.0;
 

lib/screens/libraries/tabs/library_recommended_tab.dart

@@ -255,7 +255,20 @@ class _LibraryRecommendedTabState extends BaseLibraryTabState<MediaHub, LibraryR
   @override
   void focusFirstItem() {
     if (PlatformDetector.isTV()) {
-      _tvBrowseRailKey.currentState?.requestFocus();
+      final rail = _tvBrowseRailKey.currentState;
+      if (rail != null) {
+        rail.requestFocus();
+        return;
+      }
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        if (!mounted) return;
+        final rail = _tvBrowseRailKey.currentState;
+        if (rail != null) {
+          rail.requestFocus();
+        } else {
+          focusEmptyState();
+        }
+      });
       return;
     }
     if (_hubKeys.isNotEmpty && items.isNotEmpty) {