fix for The gr.ChatInterface component does not have a visible parameter

fix info: the gr.ChatInterface is wrapped in a gr.Group component named chat_group. The visible parameter is applied to the chat_group instead of the chat_interface. The file_upload_input.upload event now updates the visibility of the chat_group instead of the chat_interface.

app.py

@@ -129,20 +129,21 @@ with gr.Blocks(title="PDF Chatbot") as demo:
             interactive=True
         )
 
-    chat_interface = gr.ChatInterface(
-        fn=chatbot.chat_with_pdf,
-        chatbot=gr.Chatbot(type="messages"),
-        textbox=gr.Textbox(placeholder="Type your question here...", scale=7),
-        examples=[["What is the main topic of the document?"], ["Summarize the key findings."], ["Who are the authors?"]],
-        title="Chat Interface",
-        theme="soft",
-        visible=False
-    )
+    chat_group = gr.Group(visible=False)
+    with chat_group:
+        chat_interface = gr.ChatInterface(
+            fn=chatbot.chat_with_pdf,
+            chatbot=gr.Chatbot(type="messages"),
+            textbox=gr.Textbox(placeholder="Type your question here...", scale=7),
+            examples=[["What is the main topic of the document?"], ["Summarize the key findings."], ["Who are the authors?"]],
+            title="Chat Interface",
+            theme="soft"
+        )
 
     file_upload_input.upload(
         fn=chatbot.process_pdf,
         inputs=[file_upload_input],
-        outputs=[file_upload_input, chat_interface]
+        outputs=[file_upload_input, chat_group]
     )
 
 demo.launch()