Update app.py

app.py

@@ -389,7 +389,7 @@ def generate_portfolio_summary():
 
 def ask_ai_question(question, as_of_month, segment, history):
     if not question or str(question).strip() == "":
-        return history or [], history or [], "Please enter a question."
+        return history or [], history or [], ""
     try:
         answer = generate_ai_answer(
             question=question,
@@ -401,7 +401,8 @@ def ask_ai_question(question, as_of_month, segment, history):
         answer = f"AI error: {str(exc)}"
 
     history = history or []
-    history.append((question, answer))
+    history.append({"role": "user", "content": question})
+    history.append({"role": "assistant", "content": answer})
     return history, history, ""