add copy all button to chatbot interface

app.py

@@ -298,7 +298,7 @@ with gr.Blocks(theme=theme, css=css, title='療癒對話機器人') as demo:
 
   with gr.Row() as main_interface:
     with gr.Column() as chatbot_interface:
-      chatbot = gr.Chatbot(label="聊天機器人", show_share_button=False, bubble_full_width=False, layout='bubble', scale=6)
+      chatbot = gr.Chatbot(label="聊天機器人", show_share_button=False, bubble_full_width=False, show_copy_all_button=True, layout='bubble', scale=6)
       msg = gr.Textbox(show_label=False, placeholder="今天想要跟我分享什麼呢？", autofocus=True, scale=2)
       with gr.Row():
         submit = gr.Button("送出", variant="primary", scale=2)