feat: add hazardous goods declaration feature

- Introduced HazardDeclarationPanel component to display dangerous goods declaration details.
- Updated URL constants to include CLEARANCE_PROCEED endpoint for re-requesting operations.
- Enhanced permissions to include hazardous approval roles for contract approvals.
- Integrated HazardDeclarationPanel into ContractRequestDetailPage and ContractClearanceDetailPage.
- Added proceedToOperation method in bookings service for handling operation re-requests.
- Updated contract forms and schemas to include hazard class and UN number fields.
- Implemented validation for hazardous contracts in the contract creation flow.
- Added expiry notice functionality for contracts nearing validity end.
- Created tests for expiry notice calculations and labels.
- Updated UI components to reflect hazardous cargo information and validation errors.

apps/edr-freight-api/src/modules/contracts/contracts.service.ts

@@ -343,6 +343,10 @@ export class ContractsService {
       lastMileDeliveryLat: dto.lastMileDeliveryLat ?? null,
       lastMileDeliveryLng: dto.lastMileDeliveryLng ?? null,
       isHazardous: dto.isHazardous ?? false,
+      // Hazard class / UN number only exist on a hazardous contract — a stale
+      // pair from an earlier draft must never survive the flag being turned off.
+      hazardClass: dto.isHazardous ? (dto.hazardClass ?? null) : null,
+      unNumber: dto.isHazardous ? (dto.unNumber ?? null) : null,
       isReefer: dto.isReefer ?? false,
       contractType: dto.contractType ?? null,
       status: 'DRAFT',
@@ -515,6 +519,13 @@ export class ContractsService {
       paymentCurrency: dto.paymentCurrency ?? existing.paymentCurrency,
       isHazardous: dto.isHazardous ?? existing.isHazardous,
       isReefer: dto.isReefer ?? existing.isReefer,
+      // Same rule as create: clearing the flag clears the declaration with it.
+      hazardClass: (dto.isHazardous ?? existing.isHazardous)
+        ? (dto.hazardClass ?? existing.hazardClass ?? null)
+        : null,
+      unNumber: (dto.isHazardous ?? existing.isHazardous)
+        ? (dto.unNumber ?? existing.unNumber ?? null)
+        : null,
       equipmentReturn: dto.equipmentReturn ?? existing.equipmentReturn,
       firstMilePickupAddress: dto.firstMilePickupAddress ?? existing.firstMilePickupAddress,
       firstMilePickupLat: dto.firstMilePickupLat ?? existing.firstMilePickupLat,