Choicebox migration

Replace the removed Choicebox compatibility API.

The deprecated Choicebox registry entry, all Choicebox* exports, its demos, and the AutoForm choicebox built-in field type have been removed in this breaking release.

Use Field choice cards with RadioGroup and RadioGroupItem for a selectable card layout. Keep labels associated with their real radio controls, and preserve the group’s value, disabled state, and validation messages.

For AutoForm, change fieldType: 'choicebox' or a UI control: 'choicebox' annotation to radio. This is an explicit migration, not an automatic fallback or a retained alias. Use a custom registered field renderer when the application needs a richer card layout.

Install the replacement, update application imports and props, and remove old copied Choicebox source. Reinstall existing reverse dependents with --overwrite so their copied imports no longer reference the removed entry.