feat: implement wagon transfer management modals and page

- Add TransferFulfillModal for fulfilling wagon transfer requests.
- Create TransferRequestFormModal for filing new wagon transfer requests.
- Introduce TransferCloseShortModal for closing requests that cannot be fully fulfilled.
- Develop WagonTransfersPage to manage and display wagon transfer requests.
- Implement utility functions for handling wagon transfer request data and UI components.
- Enhance UI with Mantine components for better user experience.

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

@@ -86,6 +86,17 @@ export class ContractsRepository extends BaseRepository<Contract> {
       .andWhere('contract.status NOT IN (:...terminal)', {
         terminal: TERMINAL_CONTRACT_STATUSES,
       })
+      // A ONE_TIME contract allows a single booking, so once that booking
+      // exists the contract is spent and can never carry another shipment.
+      // Without this it kept blocking new requests on the same service type +
+      // route until its validity lapsed — locking a customer out of a lane for
+      // the rest of the term after one completed shipment.
+      .andWhere(
+        `(contract.contract_kind <> 'ONE_TIME' OR NOT EXISTS (
+            SELECT 1 FROM freight.bookings b
+             WHERE b.contract_id = contract.id AND b.deleted_at IS NULL
+         ))`,
+      )
       .getMany();
   }