feat(ui): add MissionControlViewModel

src/ClaudeDo.Ui/Services/Interfaces/IWorkerClient.cs

@@ -34,6 +34,8 @@ public interface IWorkerClient : INotifyPropertyChanged
 
     string? LastApproveTarget { get; }
 
+    IReadOnlyList<ActiveTask> GetActiveTasks();
+
     Task WakeQueueAsync();
     Task RunNowAsync(string taskId);
     Task ContinueTaskAsync(string taskId, string followUpPrompt);