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/TasksIslandViewModel.cs

@@ -14,6 +14,8 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     private ListNavItemViewModel? _currentList;
 
     public event EventHandler? SelectionChanged;
+    public event EventHandler? FocusAddTaskRequested;
+    public void RequestFocusAddTask() => FocusAddTaskRequested?.Invoke(this, EventArgs.Empty);
 
     public ObservableCollection<TaskRowViewModel> Items { get; } = new();