refactor: Feedback API integration and UI improvements

app.py

@@ -223,7 +223,7 @@ def create_demo():
                     interactive=False
                 )
 
-        chatbot = gr.Chatbot(type='tuples', label="""The Multimodal Chatbot will be ready once you select a mode""")
+        chatbot = gr.Chatbot(label="""The Multimodal Chatbot will be ready once you select a mode""")
         feedback_box = gr.Textbox(label="Conversation turn feedback", placeholder="If the conversation is not complete, feedback for each turn will be displayed here", interactive=False)
 
         msg = gr.Textbox(label="Type your answer here")