use:enhance vs callback form variant rendering, self-relation error, submit disabled on missing related person, submit disabled on yearError. 5 new tests covering ~10 branches. Refs #496. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
use:enhance vs callback form variant rendering, self-relation error, submit disabled on missing related person, submit disabled on yearError. 5 new tests covering ~10 branches. Refs #496. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>