Fix: Gradio 6 Chatbot message format

app.py

@@ -112,7 +112,8 @@ with gr.Blocks(title="BPY Chat") as demo:
         if not message.strip():
             return "", chat_history, None
         response, render_path = chat_with_blender(message, chat_history)
-        chat_history.append((message, response))
+        chat_history.append({"role": "user", "content": message})
+        chat_history.append({"role": "assistant", "content": response})
         return "", chat_history, render_path
 
     btn.click(respond, [msg, chatbot], [msg, chatbot, render_output])