v4

app.py

@@ -795,7 +795,7 @@ def create_application():
     # Create the UI components
     demo, chatbot, question_input, submit_button, streaming_output_display = create_ui()
     
-    def user_message(user_input: str, chat_history: List[Tuple[str, str]]) -> Tuple[str, List[Tuple[str, str]]]:
+    def user_message(user_input: str, chat_history: List[List[str]]) -> Tuple[str, List[List[str]]]:
         """Add user message to chat history and clear input."""
         if not user_input.strip():
             return "", chat_history
@@ -807,7 +807,7 @@ def create_application():
             chat_history = []
         
         # Add user message and empty assistant response
-        chat_history.append((user_input, None))
+        chat_history.append([user_input, None])
         
         # Clear the input
         return "", chat_history