Form

The form shell — 24px between Fields, submit actions in a right-aligned row at the end.

Submit stays disabled until the form is dirty and valid; Cancel appears once dirty; submit shows pending on click.
One commit model per screen. A staged form never holds an instant control such as a Switch.
Actions sit in one right-aligned row at the end — never a save button beside each field.
Forms go single-column before their fields go narrow.