fix: type error

app.py

@@ -237,8 +237,10 @@ def submit(sender_value, chatbot_value):
                             else:
                                 reasoning_duration = 0.0
                                 thought_cost_time = "0.00"
-                            message_content[-2]["options"]["title"] = f"End of Thought ({thought_cost_time}s)"
-                            message_content[-2]["options"]["status"] = "done"
+                            # Simplify options structure
+                            message_content[-2]["options"] = {
+                                "title": f"End of Thought ({thought_cost_time}s)"
+                            }
 
                     yield {chatbot: gr.update(value=chatbot_value)}
                     
@@ -260,8 +262,9 @@ def submit(sender_value, chatbot_value):
                                 thought_cost_time = "0.00"
                         else:
                             thought_cost_time = "{:.2f}".format(reasoning_duration)
-                        message_content[-2]["options"]["title"] = f"End of Thought ({thought_cost_time}s)"
-                        message_content[-2]["options"]["status"] = "done"
+                        message_content[-2]["options"] = {
+                            "title": f"End of Thought ({thought_cost_time}s)"
+                        }
                     
                     chatbot_value[-1]["loading"] = False
                     yield {chatbot: gr.update(value=chatbot_value)}