refactor(ipc): declare the SignalR wire DTOs once in ClaudeDo.Data

WorkerHub and IWorkerClient each carried their own copy of every record and
had already drifted — MergePreviewDto lost its verify fields on the client
side, two records disagreed on their name. They now live in Data/Wire.cs and
reach both sides via a <Using> item, so a hub signature change is a compile
error instead of a silently dropped JSON field.

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

@@ -63,7 +63,7 @@ public interface IWorkerClient : INotifyPropertyChanged
 
     string? LastApproveTarget { get; }
 
-    IReadOnlyList<ActiveTask> GetActiveTasks();
+    IReadOnlyList<ActiveTaskDto> GetActiveTasks();
 
     Task WakeQueueAsync();
     Task RunNowAsync(string taskId);