feat(review): unify review actions into the Git-tab cockpit

Grow the detail-pane Git tab into the review+merge cockpit: target,
pre-flight mergeability, inspect actions, then the four review verbs
(Approve & Merge / Send back / Park / Cancel) plus a demoted
Reset (discard branch).

The decision block is gated independently of the merge controls so
sandbox (no-worktree) review tasks still get the buttons.

- Add ParkReviewCommand (-> RejectReviewToIdleAsync)
- Send back (reject-to-queue) disabled until feedback is entered
- Remove the mislabeled [Continue]/[Reset] line from the Output tab
- Accent dot on the Git tab while awaiting review

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

@@ -337,7 +337,12 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
     public Func<string, System.Threading.Tasks.Task>? ShowErrorAsync { get; set; }
 
     // ── Review ──────────────────────────────────────────────────────────────
-    [ObservableProperty] private string _reviewFeedback = "";
+    [ObservableProperty]
+    [NotifyPropertyChangedFor(nameof(HasReviewFeedback))]
+    [NotifyCanExecuteChangedFor(nameof(RejectReviewCommand))]
+    private string _reviewFeedback = "";
+
+    public bool HasReviewFeedback => !string.IsNullOrWhiteSpace(ReviewFeedback);
 
     // Kept for backwards-compat surface — delegates to Merge.RequestConflictResolution
     public Func<string, string, System.Threading.Tasks.Task>? RequestConflictResolution
@@ -1169,7 +1174,7 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         }
     }
 
-    [RelayCommand]
+    [RelayCommand(CanExecute = nameof(HasReviewFeedback))]
     private async System.Threading.Tasks.Task RejectReviewAsync()
     {
         if (Task is null || !_worker.IsConnected) return;
@@ -1180,6 +1185,15 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         ReviewFeedback = "";
     }
 
+    // Park: set the task aside (back to Idle), keeping its worktree intact.
+    [RelayCommand]
+    private async System.Threading.Tasks.Task ParkReviewAsync()
+    {
+        if (Task is null || !_worker.IsConnected) return;
+        try { await _worker.RejectReviewToIdleAsync(Task.Id); }
+        catch { /* stale review action; broadcast reconciles */ }
+    }
+
     [RelayCommand]
     private async System.Threading.Tasks.Task ResetReviewAsync()
     {