Add copy button in ADK Web UI chat response

Is your feature request related to a problem? Please describe.
It is inconvinient to select the content of ADK Web UI chat response when the response is a several pages long.

Use Case:
A developer tests an agent in ADK Web UI and wants to share response with collaborators.

Describe the solution you'd like
Add a 'copy' button in chat interface so the response can be copied in one click.

Describe alternatives you've considered
(1) Use an OS built-in copy/paste functionality.
This option is inconvinient when the response is a several page long..

Additional context
There is a discussion thread on this freature request at https://github.com/google/adk-python/discussions/1228 .

Let me know your thoughts and suggestions !