feat(ui): Lists island view with search and nav items

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -1,8 +1,17 @@
 using Avalonia.Controls;
+using Avalonia.Interactivity;
+using ClaudeDo.Ui.ViewModels.Islands;
 
 namespace ClaudeDo.Ui.Views.Islands;
 
 public partial class ListsIslandView : UserControl
 {
     public ListsIslandView() { InitializeComponent(); }
+
+    private void OnItemTapped(object? sender, RoutedEventArgs e)
+    {
+        if (sender is Border { DataContext: ListNavItemViewModel item }
+            && DataContext is ListsIslandViewModel vm)
+            vm.SelectCommand.Execute(item);
+    }
 }