Step-by-step plan to port AddEventDialog UX (header, full keyboard nav,
date+time via DateField) into TaskFormDialog. Two new shared hooks
(useRovingFocus, useListboxKeys), parseDate time-suffix, DateField
withTime + flat props, and i18n updates across all 5 languages.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
