add contract reference to bookings list and enhance search functionality

packages/types/src/freight/index.ts

@@ -388,6 +388,8 @@ export interface IBooking extends BaseEntity {
   customerId: string;
   /** The contract this booking was created under (Path A / Path B). */
   contractId?: string | null;
+  /** Human-readable reference of the parent contract, joined onto list rows. */
+  contractReference?: string | null;
   trainId?: string | null;
   status: BookingStatus;
   /** ONE_TIME for normal bookings; GENERAL_CONTRACT for umbrella contracts. */