The /api/portal/appointments endpoint returns ISO startTime/endTime plus
nested pet/service/staff objects, but the portal client Appointment type
expected flat date/time/petName fields. isUpcoming() read appt.date/appt.time
(both undefined), so parseTimeTo24Hour(undefined) threw a TypeError; the
useEffect try/catch set the error state and the success-path-only Book New
button became unreachable.
- Add normalizeAppointment() at the fetch boundary mapping the API shape to the
flat Appointment shape (derives display date/time from startTime, duration
from the start/end delta), tolerant of the legacy flat shape.
- Prefer absolute startTime in isUpcoming(); fall back to date/time.
- Harden parseTimeTo24Hour against blank/undefined input (no NaN).
- Add Appointment.startTime/endTime to the type.
- Tests: normalizeAppointment + isUpcoming(startTime) + parseTimeTo24Hour safety.
- Update UAT_PLAYBOOK.md §5.12.2 and new §5.12d regression cases.
Co-Authored-By: Paperclip <noreply@paperclip.ing>