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/components/warehouses/ReleaseOrderModal.tsx

@@ -121,6 +121,14 @@ export function ReleaseOrderModal({ opened, onClose, item, truckPrefill }: Relea
     queryFn: () => warehouseService.getCustomerTrucks(bookingId as string),
     enabled: opened && Boolean(bookingId),
   });
+  // EDR last-mile trucks assigned to this booking — surfaced even when the modal
+  // is opened from the warehouse flow (which passes no truckPrefill prop), so an
+  // assigned EDR truck no longer shows as "not assigned yet".
+  const { data: lastMileTrucks = [] } = useQuery({
+    queryKey: ['release-last-mile-trucks', bookingId],
+    queryFn: () => warehouseService.getLastMileTrucks(bookingId as string),
+    enabled: opened && Boolean(bookingId),
+  });
   // Per-container cargo weights — the truck's net (gross − tare) must equal the
   // total cargo weight of the containers selected as loaded on it.
   const { data: containerWeights = [] } = useQuery({
@@ -176,6 +184,24 @@ export function ReleaseOrderModal({ opened, onClose, item, truckPrefill }: Relea
   const isCustomerAssignedTruck = Boolean(item?.booking?.customerTruckAssignedAt);
   const hasLastMileTruckPrefill = Boolean(truckPrefill?.truckPlateNumber || truckPrefill?.trailerPlateNumber);
 
+  // Opened from the warehouse flow (no truckPrefill prop): once the last-mile
+  // truck query resolves, auto-fill the first assigned EDR truck — without
+  // overwriting anything the operator typed or the locked exit-step values.
+  useEffect(() => {
+    if (!opened || truckPrefill || isExitStep) return;
+    const first = lastMileTrucks[0];
+    if (!first) return;
+    setTruckPlateNumber((p) => p || first.truckPlateNumber || '');
+    setTrailerPlateNumber((p) => p || first.trailerPlateNumber || '');
+    setDriverName((p) => p || first.driverName || '');
+    setDriverLicense((p) => p || first.driverLicense || '');
+    setDriverPhone((p) => p || first.driverPhone || '');
+    setTruckType((p) => p || first.truckType || '');
+    setContainerNumbers((prev) =>
+      prev.length === 1 && !prev[0] && first.containerNumber ? [first.containerNumber] : prev,
+    );
+  }, [opened, truckPrefill, isExitStep, lastMileTrucks]);
+
   // Registered trucks for THIS booking, from both sources: EDR last-mile
   // (truckPrefill) and the customer portal (customer_truck_assignments).
   const assignedTruckOptions = [
@@ -199,6 +225,16 @@ export function ReleaseOrderModal({ opened, onClose, item, truckPrefill }: Relea
       driverPhone: '',
       truckType: t.truckType,
     })),
+    ...lastMileTrucks
+      .filter((t) => t.truckPlateNumber || t.vehicleId)
+      .map((t) => ({
+        value: (t.truckPlateNumber || t.vehicleId) as string,
+        label: `Last-mile · ${t.truckPlateNumber ?? ''}${t.driverName ? ` — ${t.driverName}` : ''}`,
+        trailerPlate: t.trailerPlateNumber ?? '',
+        driverName: t.driverName ?? '',
+        driverPhone: t.driverPhone ?? '',
+        truckType: t.truckType ?? '',
+      })),
   ];
   // Only trucks actually assigned to THIS booking (last-mile prefill or customer
   // portal) are selectable. No global fleet list — if nothing is assigned, the