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-api/src/modules/bookings/customer-truck.service.ts

@@ -328,18 +328,21 @@ export class CustomerTruckService {
     if (assignment.departedAt) {
       throw new ConflictException('This truck has already left — its load is locked');
     }
-    // Containers can only be loaded after the truck has physically arrived at the
-    // warehouse (arrival weighing recorded). Assignment alone is just planning.
-    if (!assignment.arrivedAt) {
-      throw new BadRequestException(
-        'Record the truck arrival before loading — containers can only be loaded onto an arrived truck',
-      );
-    }
+    // Loading a truck at the warehouse implies it is physically present, so a
+    // truck that is still only assigned (not yet marked arrived) is auto-arrived
+    // here rather than blocking the operator — the real gross is weighed on
+    // departure anyway.
+    const needsArrival = !assignment.arrivedAt;
 
     const requested = (dto.containerNumbers ?? []).map((n) => n.trim().toUpperCase());
     if (!requested.length) {
       throw new BadRequestException('Select at least one container to load onto the truck');
     }
+    // Capacity is size-based: a truck carries at most 2 containers, and a 40ft
+    // container fills the truck (max 1) — mirror the addTruck/updateTruck rule.
+    if (requested.length > 2) {
+      throw new BadRequestException('A truck carries at most 2 containers');
+    }
     const bookingNumbers = await this.bookingContainerNumbers(bookingId);
     for (const n of requested) {
       if (!bookingNumbers.includes(n)) {
@@ -352,6 +355,12 @@ export class CustomerTruckService {
         throw new ConflictException(`Container ${n} is already loaded onto another truck`);
       }
     }
+    const sizes = await this.containerSizes(bookingId, requested);
+    if (sizes.some((s) => s.includes('40')) && requested.length > 1) {
+      throw new BadRequestException(
+        'A 40ft container fills the truck — load only 1 container onto this truck',
+      );
+    }
 
     const grossTons = await this.vgmTonsForContainers(bookingId, requested);
     await this.dataSource.transaction(async (manager) => {
@@ -371,9 +380,20 @@ export class CustomerTruckService {
       );
       // Provisional gross (tonnes) from the loaded containers' VGM — overridden
       // by the weighed gross on departure. (Column is *_kg but holds tonnes.)
+      // Auto-stamp arrival if the truck was still only assigned.
       await manager.getRepository(CustomerTruckAssignment).update(assignmentId, {
         grossWeightKg: grossTons,
+        ...(needsArrival ? { arrivedAt: new Date() } : {}),
       });
+      if (needsArrival) {
+        await manager.query(
+          `UPDATE freight.bookings
+              SET customer_truck_arrived_at = COALESCE(customer_truck_arrived_at, NOW()),
+                  updated_at = NOW()
+            WHERE id = $1`,
+          [bookingId],
+        );
+      }
     });
     return this.listTrucks(bookingId);
   }

apps/edr-freight-api/src/modules/bookings/dto/load-customer-truck.dto.ts

@@ -1,9 +1,11 @@
-import { ArrayMinSize, ArrayUnique, IsArray, Matches } from 'class-validator';
+import { ArrayMaxSize, ArrayMinSize, ArrayUnique, IsArray, Matches } from 'class-validator';
 
 /** Containers loaded onto a truck at Truck_dispatch (after arrival, before it leaves). */
 export class LoadCustomerTruckDto {
   @IsArray()
   @ArrayMinSize(1)
+  // A truck carries at most 2 containers (two 20ft, or one 40ft).
+  @ArrayMaxSize(2)
   @ArrayUnique()
   @Matches(/^[A-Z]{4}\d{7}$/, {
     each: true,