feat(ui): open Mission Control from the title bar

src/ClaudeDo.Ui/Services/IDialogService.cs

@@ -1,4 +1,5 @@
 using System.Threading.Tasks;
+using ClaudeDo.Ui.ViewModels;
 using ClaudeDo.Ui.ViewModels.Conflicts;
 using ClaudeDo.Ui.ViewModels.Modals;
 
@@ -28,4 +29,7 @@ public interface IDialogService
 
     /// <summary>Modal error notice with a single dismiss button.</summary>
     Task ShowErrorAsync(string message);
+
+    /// <summary>Show (or re-show + focus) the modeless Mission Control window. Lazily created; hides on close.</summary>
+    void ShowMissionControl(MissionControlViewModel vm);
 }