feat(freight): surface scheduling clock and gate pay during drain

packages/types/src/freight/index.ts

@@ -717,6 +717,12 @@ export interface IBooking extends BaseEntity {
   selectedForBatchAt?: string | null;
   /** End of the pay window once the booking is SELECTED_FOR_BATCH. */
   paymentDeadline?: string | null;
+  /**
+   * End of the settlement drain tail that follows `paymentDeadline`. Between the
+   * two, an in-flight payment can still land, so the customer is shown a
+   * "payment processing" state instead of a pay action.
+   */
+  paymentDrainEndsAt?: string | null;
 
   containers?: Array<{ type: string; qty: number; vgm: number }> | null;