assistant2: Fix model selector position (#23721)

This PR makes the model selector not render on top of its trigger.

<img width="800" alt="Screenshot 2025-01-27 at 12 02 01 PM"
src="https://github.com/user-attachments/assets/76c5ac6f-ae27-4b3d-a80a-3027042c75f8"
/>

Release Notes:

- N/A
91f44725d9Danilo Leal committed on 1/27/2025, 3:28:45 PM· committed by GitHubparentb58c994
1 file changedLine totals unavailable