feat(ui): unfinished planning session dialog

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

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -371,6 +371,8 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
         => await DiscardPlanningSessionAsync(taskId, ct);
     async Task IWorkerClient.FinalizePlanningSessionAsync(string taskId, bool queueAgentTasks, CancellationToken ct)
         => await FinalizePlanningSessionAsync(taskId, queueAgentTasks, ct);
+    async Task<int> IWorkerClient.GetPendingDraftCountAsync(string taskId, CancellationToken ct)
+        => await GetPendingDraftCountAsync(taskId, ct);
 
     // DTOs for deserializing hub responses
     private sealed class ActiveTaskDto