This PR adds an enabled indicator in the Max Mode tooltip to show when
it is enabled:

<img width="409" alt="Screenshot 2025-05-06 at 9 49 48 AM"
src="https://github.com/user-attachments/assets/43d3f6dd-5658-467a-9df9-606ce326426a"
/>

Release Notes:

- Agent Beta: Added an indicator in the Max Mode tooltip to show when it
is enabled.

Co-authored-by: Danilo <danilo@zed.dev>