feat(worker): broadcast interactive message queue + delivery

StreamingClaudeSession raises onQueueChanged (pending snapshot) and onUserMessageSent
(on delivery, incl. the seeded first prompt); InteractiveSessionService forwards these
as InteractiveQueueChanged/InteractiveMessageSent broadcasts. Lets the UI show queued
messages above the input and move a message into the transcript only when actually
delivered to Claude. Client events + fakes updated.

src/ClaudeDo.Worker/Planning/InteractiveSessionService.cs

@@ -88,7 +88,9 @@ public sealed class InteractiveSessionService
             var streamingSession = new StreamingClaudeSession(
                 transport,
                 onLine,
-                _loggerFactory.CreateLogger<StreamingClaudeSession>());
+                _loggerFactory.CreateLogger<StreamingClaudeSession>(),
+                onQueueChanged: pending => _ = _broadcaster.InteractiveQueueChanged(taskId, pending),
+                onUserMessageSent: text => _ = _broadcaster.InteractiveMessageSent(taskId, text));
             await streamingSession.StartAsync(args, workingDir, seededPrompt, ct);
             session = streamingSession;
             exitTask = transport.WaitForExitAsync();