feat(worker): remove a queued interactive message

StreamingClaudeSession.RemoveQueuedAsync drops the first occurrence of a queued
message from _pending and re-broadcasts the updated queue. Wired through
InteractiveSessionService + WorkerHub.RemoveQueuedInteractiveMessage +
IWorkerClient.RemoveQueuedInteractiveMessageAsync. Removal by text (first match)
is robust to a turn flushing mid-click. Fakes + ILiveSession impls updated.

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

@@ -52,6 +52,7 @@ public interface IWorkerClient : INotifyPropertyChanged
     /// <summary>Answer a question a running task raised via AskUser.</summary>
     Task AnswerTaskQuestionAsync(string taskId, string questionId, string answer);
     Task SendInteractiveMessageAsync(string taskId, string text);
+    Task RemoveQueuedInteractiveMessageAsync(string taskId, string text);
     Task StopInteractiveSessionAsync(string taskId);
     Task InterruptInteractiveSessionAsync(string taskId);
     /// <summary>The question a running task is currently blocked on, if any (for re-attach).</summary>

src/ClaudeDo.Ui/Services/WorkerClient.cs

@@ -309,6 +309,12 @@ public partial class WorkerClient : ObservableObject, IAsyncDisposable, IWorkerC
         catch { /* offline or session already ended */ }
     }
 
+    public async Task RemoveQueuedInteractiveMessageAsync(string taskId, string text)
+    {
+        try { await _hub.InvokeAsync("RemoveQueuedInteractiveMessage", taskId, text); }
+        catch { /* offline or session already ended */ }
+    }
+
     public async Task StopInteractiveSessionAsync(string taskId)
     {
         try { await _hub.InvokeAsync("StopInteractiveSession", taskId); }