intent reference generation + propagation

frontend/pshared/lib/data/mapper/payment/quote.dart

@@ -7,6 +7,7 @@ import 'package:pshared/models/payment/quote/quote.dart';
 extension PaymentQuoteDTOMapper on PaymentQuoteDTO {
   PaymentQuote toDomain({String? idempotencyKey}) => PaymentQuote(
     quoteRef: quoteRef,
+    intentRef: intentRef,
     idempotencyKey: idempotencyKey,
     amounts: amounts?.toDomain(),
     fees: fees?.toDomain(),
@@ -17,6 +18,7 @@ extension PaymentQuoteDTOMapper on PaymentQuoteDTO {
 extension PaymentQuoteMapper on PaymentQuote {
   PaymentQuoteDTO toDTO() => PaymentQuoteDTO(
     quoteRef: quoteRef,
+    intentRef: intentRef,
     amounts: amounts?.toDTO(),
     fees: fees?.toDTO(),
     fxQuote: fxQuote?.toDTO(),