feat(ui): wire merge-aware approve and preview into the worker client

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

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

@@ -647,7 +647,7 @@ public sealed partial class TasksIslandViewModel : ViewModelBase
     private async Task ApproveReviewAsync(TaskRowViewModel? row)
     {
         if (row is null || !row.IsWaitingForReview || _worker is null) return;
-        try { await _worker.ApproveReviewAsync(row.Id); }
+        try { await _worker.ApproveReviewAsync(row.Id, ""); }
         catch { /* offline; broadcast reconciles on return */ }
     }