Fix missing booking confirmation emails for anonymous visitors

[gonengar]

Summary

Anonymous visitors who booked an appointment were never receiving the confirmation email, even though the booking record showed status: CONFIRMED. The site already has the preinstalled "Send clients an email confirmation when they book" automation (active), but its trigger gate evaluated false on every booking we created.

The automation fires on wix_bookings-sessions_booked and is gated by:

notify_participants = true AND approval_service = false AND contact_id != null

Inspecting recent bookings on the live site showed each one missing one or more of these signals:

Booking	participantNotification	contactId	paymentStatus	selectedPaymentOption
Old (confirmBooking-only path)	set at confirm-time (after sessions_booked already fired)	empty	UNDEFINED	UNDEFINED
New (this PR)	set at create-time	populated via appendOrCreateContact	PAID	OFFLINE

Changes

• src/components/BookEngineer.tsx — before createBooking:
  • Call submittedContact.appendOrCreateContact to upsert the CRM contact and resolve a real contactId.
  • Pass contactDetails.contactId into createBooking so the booking is linked at create-time rather than relying on async resolution from the anonymous visitor identity.
  • Pass participantNotification: { notifyParticipants: true, message } as the second createBooking arg so the notify_participants flag persists on the booking entity (this is what the trigger reads — confirm-time notifications don't backfill it).
  • Add selectedPaymentOption: "OFFLINE" so the booking record reflects the actual payment path.
• src/pages/api/bookings/confirm.ts — switch from confirmBooking to confirmOrDecline with paymentStatus: "PAID" via an elevated httpClient.fetchWithAuth call (the SDK doesn't yet expose confirmOrDecline on the auto-SDK we use). Matches the offline-paid flow.

Test plan

• Book an appointment as a logged-out visitor on the preview deployment.
• Verify in the dashboard that the resulting booking has paymentStatus: PAID, selectedPaymentOption: OFFLINE, participantNotification.notifyParticipants: true, and a non-null contactDetails.contactId.
• Confirm the customer email arrives at the inbox used on the booking form.
• Book a second time with the same email — confirm the contact is reused (same contactId, no duplicate CRM contact).

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