Update app.py

app.py

@@ -708,7 +708,7 @@ with gr.Blocks(title="CKD-MultiVision") as demo:
         # ── Tab 2: CKD Health Coach ────────────────────────────────────────
         with gr.TabItem(" CKD Health Coach"):
             gr.Markdown("### Ask about diet, lifestyle, exercise, and kidney health.")
-            chatbot = gr.Chatbot(height=450, type="messages")
+            chatbot = gr.Chatbot(height=450
             chat_input = gr.Textbox(placeholder="Ask a question about CKD...", label="Your Message")
             send_btn   = gr.Button("Send", variant="primary")
             gr.Examples(
@@ -794,8 +794,7 @@ with gr.Blocks(title="CKD-MultiVision") as demo:
             return history, ""
         bot_response = chat_with_groq(message, history)
         history = history or []
-        history.append({"role": "user", "content": message})
-        history.append({"role": "assistant", "content": bot_response})
+        history.append((message, bot_response))
         return history, ""
 
     send_btn.click(fn=respond, inputs=[chat_input, chatbot], outputs=[chatbot, chat_input])