** Please make sure you read the contribution guide and file the issues in the right place. **
Contribution guide.

Is your feature request related to a problem? Please describe.

Up to now, session display with an UUID. If users have lots of sessions, session display bar is not clearly for user to know this or that session topic.

Describe the solution you'd like

After create session, title is empty. Once user chat with target agent in someone session, session title will be updated after event generated.

==== session display bar ===
- Hello
- What'is the weather like tody in New York?
- ADK Analysis
...
==== session display bar ===

Assumption

Describe alternatives you've considered

Additional context

N/A