Similar to how you can use `shift-tab` to cycle through profiles/modes,
you can now use `alt-tab` to cycle through the language models you have
favorited.

<img width="500" height="312" alt="Screenshot 2025-12-16 at 5  23@2x"
src="https://github.com/user-attachments/assets/006d417d-5da1-48f9-82cc-ea06e28adb30"
/>

Release Notes:

- agent: Added the ability to cycle through favorited models using the
`alt-tab` keybinding.