feat(warehouse,last-mile): truck load size rule, dedup last-mile, driver-required + arrival prefill

Truck loading:
- loadTruck enforces max 2 containers / one 40ft (two 20ft) and auto-marks an
  assigned truck arrived on load; container-items payload + modal expose
  container size with a client-side selection cap.
- Show "#x containers pending assignment" in the portal truck card and the
  backoffice container modal.

Last-mile:
- create() is idempotent — return the existing record for a booking instead of
  inserting a duplicate delivery row (fixed the same booking showing twice in
  Assign-Mile).
- setVehicles/update reject a truck with no assigned driver; the Assign toast
  now surfaces the reason.
- New GET /last-mile/booking/:id/arrival-trucks returns assigned EDR trucks with
  driver details; ReleaseOrderModal fetches and auto-fills them so an assigned
  EDR truck no longer reads as "not assigned yet".

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/edr-freight-web/backoffice/src/services/warehouse.service.ts

@@ -71,6 +71,8 @@ export type ContainerItemStage = 'PENDING' | 'RECEIVED' | 'GRN' | 'ASSIGNED' | '
 export interface ContainerItem {
   containerNumber: string;
   goods: string | null;
+  /** Container size, e.g. "20ft" / "40ft"; null for bulk. */
+  containerSize: string | null;
   stage: ContainerItemStage;
   grnNumber: string | null;
   truckAssignmentId: string | null;
@@ -126,6 +128,18 @@ const cleanParams = (params: object) =>
     Object.entries(params).filter(([, value]) => value !== undefined && value !== '' && value !== null),
   );
 
+/** An assigned EDR last-mile truck, shaped for the arrival/exit weighing prefill. */
+export interface LastMileArrivalTruck {
+  vehicleId: string;
+  truckPlateNumber: string | null;
+  trailerPlateNumber: string | null;
+  driverName: string | null;
+  driverLicense: string | null;
+  driverPhone: string | null;
+  truckType: string | null;
+  containerNumber: string | null;
+}
+
 export const warehouseService = {
   /** Customer self-haul trucks assigned to a booking (portal multi-truck). */
   getCustomerTrucks: async (bookingId: string): Promise<Freight.ICustomerTruck[]> => {
@@ -133,6 +147,12 @@ export const warehouseService = {
     return data?.data ?? data ?? [];
   },
 
+  /** Assigned EDR last-mile trucks for a booking (arrival/exit weighing prefill). */
+  getLastMileTrucks: async (bookingId: string): Promise<LastMileArrivalTruck[]> => {
+    const { data } = await apiClient.get(`/last-mile/booking/${bookingId}/arrival-trucks`);
+    return data?.data ?? data ?? [];
+  },
+
   /** Per-container/bulk items of a booking with lifecycle stage + refs. */
   getContainerItems: async (bookingId: string): Promise<ContainerItem[]> => {
     const { data } = await apiClient.get(