Adds unsaved-warning hidden by default, oninput dirty marker, form-error banner hidden when form.error undefined. 3 new tests targeting ~6 branches. Refs #496. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Adds unsaved-warning hidden by default, oninput dirty marker, form-error banner hidden when form.error undefined. 3 new tests targeting ~6 branches. Refs #496. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>