agent: Add `use_modifier_to_send` section in the settings view (#34866)

This PR also converts all of these switch-based settings to use the new
`SwitchField` component, introduced in
https://github.com/zed-industries/zed/pull/34713.

Release Notes:

- agent: Added the ability to change the `use_modifier_to_send` setting
from the agent panel settings UI.
a3850b3d38Danilo Leal committed on 7/22/2025, 12:42:34 PM· committed by GitHubparentc7158f0
2 files changedLine totals unavailable