feat(ui): keyboard shortcuts (/ Ctrl+N Space Esc)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Ui/Views/Islands/ListsIslandView.axaml.cs

@@ -6,7 +6,15 @@ namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class ListsIslandView : UserControl
 {
-    public ListsIslandView() { InitializeComponent(); }
+    public ListsIslandView()
+    {
+        InitializeComponent();
+        DataContextChanged += (_, _) =>
+        {
+            if (DataContext is ListsIslandViewModel vm)
+                vm.FocusSearchRequested += (_, _) => SearchBox.Focus();
+        };
+    }
 
     private void OnItemTapped(object? sender, RoutedEventArgs e)
     {