Update app.py

app.py

@@ -255,13 +255,16 @@ def reset_conversation(
 # GRADIO UI INTERFACE
 # ============================================================================
 
-def format_history_for_chatbot(history: List[Tuple[str, str]]) -> List[Tuple[str, str]]:
+def format_history_for_chatbot(history: List[Tuple[str, str]]) -> List[dict]:
     """
     Convert internal (question, answer) tuples into
-    Gradio Chatbot display format.
-    Returns the history as-is since Gradio expects [(user_msg, bot_msg), ...]
+    Gradio v4 Chatbot message format.
     """
-    return history
+    messages = []
+    for q, a in history:
+        messages.append({"role": "user", "content": q})
+        messages.append({"role": "assistant", "content": a})
+    return messages
 
 
 def generate_visual_topic_suggestions(