agent: Simplify design of the settings view (#29041)

Containing everything in boxes wasn't super necessary here. Want to
still improve the switch color contrast here, but will probably do that
in a separate PR.

<img
src="https://github.com/user-attachments/assets/f826a7a8-beaf-45d0-9dc2-36dc210c418e"
width="700"/>

Release Notes:

- N/A
e27f6a984fDanilo Leal committed on 4/18/2025, 5:24:53 PM· committed by GitHubparentcce661b
11 files changedLine totals unavailable