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

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

src/ClaudeDo.Ui/ViewModels/Islands/ListsIslandViewModel.cs

@@ -14,6 +14,8 @@ public sealed partial class ListsIslandViewModel : ViewModelBase
     private readonly IDbContextFactory<ClaudeDoDbContext> _dbFactory;
 
     public event EventHandler? SelectionChanged;
+    public event EventHandler? FocusSearchRequested;
+    public void RequestFocusSearch() => FocusSearchRequested?.Invoke(this, EventArgs.Empty);
 
     public ObservableCollection<ListNavItemViewModel> Items { get; } = new();