This PR styles the reset key state for the assistant panel.

Community issue: https://github.com/zed-industries/community/issues/2429

<img width="641" alt="Screenshot 2024-01-18 at 4 28 32 PM"
src="https://github.com/zed-industries/zed/assets/1486634/57377804-2867-45d3-906c-353130ec78e6">

Release Notes:

- Fixed the reset key screen for the assistant panel.