feat(ui): add starting state feedback to task list

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

src/ClaudeDo.Ui/ViewModels/TaskListViewModel.cs

@@ -55,6 +55,18 @@ public partial class TaskListViewModel : ViewModelBase
                         t.RunNowCommand.NotifyCanExecuteChanged();
                 });
         };
+
+        worker.RunNowRequestedEvent += taskId =>
+        {
+            var item = Tasks.FirstOrDefault(t => t.Id == taskId);
+            item?.SetStarting();
+        };
+
+        worker.TaskStartedEvent += (_, taskId, _) =>
+        {
+            var item = Tasks.FirstOrDefault(t => t.Id == taskId);
+            item?.ClearStarting();
+        };
     }
 
     public async Task LoadAsync(string? listId)