feat(bookings): allow cancelling booking confirmations

Add API endpoint to revert confirmed bookings to pending status
Add unconfirm buttons to the bookings list and confirmation page
Update inventory summary when a confirmation is cancelled

server/api/public/bookings/[token]/cancel.post.ts

@@ -0,0 +1,31 @@
+import type { CancelBookingConfirmationResponse } from '~~/shared/booking'
+
+import { cancelBookingConfirmationByConfirmationToken, getBookingByConfirmationToken } from '../../../../utils/booking-repository'
+import { getRequiredRouteParam, httpError } from '../../../../utils/http'
+
+export default defineEventHandler(async (event): Promise<CancelBookingConfirmationResponse> => {
+  const token = getRequiredRouteParam(event, 'token', 'Confirmation token')
+  const existingBooking = await getBookingByConfirmationToken(token)
+
+  if (!existingBooking) {
+    httpError(404, 'Booking not found')
+  }
+
+  if (existingBooking.status === 'pending') {
+    return {
+      booking: existingBooking,
+      alreadyPending: true
+    }
+  }
+
+  const booking = await cancelBookingConfirmationByConfirmationToken(token)
+
+  if (!booking) {
+    httpError(404, 'Booking not found')
+  }
+
+  return {
+    booking,
+    alreadyPending: false
+  }
+})