update: app.py for local streamlit

app.py

@@ -46,13 +46,13 @@ user_input = st.text_input("You:", key="input")
 if st.button("Send"):
     if user_input:
         # Add user input to history
-        st.session_state.messages.append(("User", user_input))
+        st.session_state.messages.append(("user", user_input))
 
         # Run LangGraph chatbot
         state = DataState(messages=st.session_state.messages, data={}, finished=False)
         for output in graph_with_order_tools.stream(state):
             response = output["messages"][-1]  # Get the last chatbot response
-            st.session_state.messages.append(("Bot", response))
+            st.session_state.messages.append(("ai", response))
 
 # Display chat history
 for sender, message in st.session_state.messages: