Convert the main subtitle grid to TableView (screen reader accessibility, #13015)

src/ui/Features/Main/Layout/InitLayout.cs

@@ -1007,6 +1007,14 @@ private static void CleanupControl(Control? control)
             dataGrid.Columns.Clear();
             dataGrid.ContextFlyout = null;
         }
+        // Handle TableView (the main subtitle grid) - clear data bindings and sources
+        else if (control is TableView tableView)
+        {
+            tableView.ItemsSource = null;
+            tableView.SelectedItem = null;
+            tableView.Columns.Clear();
+            tableView.ContextFlyout = null;
+        }
         // Handle TextBox - clear event handlers
         else if (control is TextBox textBox)
         {

src/ui/Features/Main/MainHelpers/RightToLeftHelper.cs

@@ -100,7 +100,7 @@ private static void MirrorTextEditGrid(Grid grid, FlowDirection flowDirection)
     /// the items source re-creates the rows; selection and scroll position are
     /// restored.
     /// </summary>
-    internal static void RefreshDataGridBindings(DataGrid? grid, System.Collections.IEnumerable? itemsSource, object? selected)
+    internal static void RefreshDataGridBindings(TableView? grid, System.Collections.IEnumerable? itemsSource, object? selected)
     {
         if (grid == null)
         {
@@ -112,7 +112,7 @@ internal static void RefreshDataGridBindings(DataGrid? grid, System.Collections.
         if (selected != null)
         {
             grid.SelectedItem = selected;
-            grid.ScrollIntoView(selected, null);
+            grid.ScrollIntoView(selected);
         }
     }
 
@@ -142,6 +142,10 @@ private static void SetFlowDirectionRecursive(Visual visual, FlowDirection flowD
         {
             dataGrid.FlowDirection = flowDirection;
         }
+        else if (visual is TableView tableView)
+        {
+            tableView.FlowDirection = flowDirection;
+        }
         else if (visual is Grid grid && grid.Name == "SubtitleTextEditGrid")
         {
             MirrorTextEditGrid(grid, flowDirection);

src/ui/Features/Main/MainView.cs

@@ -112,7 +112,7 @@ protected override object Build()
 
                 _vm.ContentGrid.InvalidateMeasure();
                 _vm.ContentGrid.InvalidateArrange();
-                Dispatcher.UIThread.Post(() => _vm.SubtitleGrid.Focus());
+                Dispatcher.UIThread.Post(() => TableViewExtras.FocusRow(_vm.SubtitleGrid));
             }, DispatcherPriority.Loaded);
         };