fixes chat.

app.py

@@ -136,9 +136,8 @@ Write like the stakes are real. Because they are.
             ]
             
             # Add chat history
-            for user_msg, assistant_msg in chat_history:
-                messages.append({"role": "user", "content": user_msg})
-                messages.append({"role": "assistant", "content": assistant_msg})
+            for msg in chat_history:
+                messages.append(msg)
             
             # Add current message
             messages.append({"role": "user", "content": message})
@@ -146,12 +145,17 @@ Write like the stakes are real. Because they are.
             # Get response from OpenAI with Langfuse tracking
             assistant_message = get_completion(messages)
             
-            chat_history.append((message, assistant_message))
+            # Update chat history with new messages
+            chat_history.append({"role": "user", "content": message})
+            chat_history.append({"role": "assistant", "content": assistant_message})
+            
             return chat_history, ""
             
         except Exception as e:
             error_message = f"Error: {str(e)}"
-            return chat_history + [(message, error_message)], ""
+            chat_history.append({"role": "user", "content": message})
+            chat_history.append({"role": "assistant", "content": error_message})
+            return chat_history, ""
 
     # Create Gradio interface
     with gr.Blocks() as demo: