feat(bookings): allow transferring bookings to another PIC

Add UI modal and button to reassign bookings to different contacts
Create API endpoint and repository method to handle PIC transfers

server/utils/bookings.ts

@@ -51,6 +51,20 @@ export function parseBookingRemarkInput(body: {
   }
 }
 
+export function parseBookingPicTransferInput(body: {
+  personInChargeId?: string | null
+}) {
+  const personInChargeId = typeof body.personInChargeId === 'string'
+    ? body.personInChargeId.trim()
+    : ''
+
+  assertBadRequest(personInChargeId, 'Person in charge is required')
+
+  return {
+    personInChargeId
+  }
+}
+
 export function buildBookingMessage(booking: PublicBooking, confirmationUrl: string) {
   return [
     `I'd like to book tickets for the ${booking.event.title}.`,