refactor: Adjust message insertion and update metadata title

app.py

@@ -319,10 +319,10 @@ def create_demo():
 
                 print(cleaned_ideal_answer)
 
-                history.append(ChatMessage(
+                history.insert(-1, ChatMessage(
                     role="assistant",
                     content=cleaned_ideal_answer_html,
-                    metadata={"title": "💡 Ideal answer"}
+                    metadata={"title": "💡 Ideal answer to your last message"}
                 ))
 
             updated_label = f"Conversation turns: {current_turns}" if conversation_mode == 'Interviewer' else "Multimodal Coach Agent"