Field Controller

Each field has a FieldController.

Member	Purpose
id	Stable field id.
kind	Field kind.
config	Normalized field config.
state	Current field state snapshot.
descriptor	Renderer descriptor from the field definition.
setValue(value)	Update value and mark dirty.
blur()	Mark touched.
focus()	Mark the active intent.
validate()	Run field validation.
reset()	Restore initial value.
subscribe(listener)	Listen to field state changes.

FieldStateSnapshot includes value, initialValue, touched, dirty, valid, visible, disabled, readOnly, errors, and status.

const threshold = mounted.form.getField("threshold");
threshold?.setValue(0.8);
await threshold?.validate();