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/common/booking-guards.ts

@@ -81,6 +81,32 @@ export const WagonTransferFulfill = () =>
 export const WagonTransferHistoryAll = () =>
   BookingStaff(FREIGHT_PERMS.wagons.transferHistoryAll);
 
+/**
+ * Open the transfer-requests desk. `wagons:view` is accepted as a one-of
+ * fallback so staff who could already reach the queue keep it without a
+ * re-grant — same pattern the granular fleet keys use.
+ */
+export const WagonTransferView = () =>
+  BookingStaff([FREIGHT_PERMS.wagons.transferView, FREIGHT_PERMS.wagons.view]);
+
+/** Withdraw a request that has not moved any wagon yet. */
+export const WagonTransferCancel = () =>
+  BookingStaff([
+    FREIGHT_PERMS.wagons.transferCancel,
+    FREIGHT_PERMS.wagons.transferRequest,
+  ]);
+
+/**
+ * End a request short of the requested count. Whoever may move wagons may also
+ * declare the yard has no more to give, so fulfil is accepted alongside the
+ * dedicated key.
+ */
+export const WagonTransferCloseShort = () =>
+  BookingStaff([
+    FREIGHT_PERMS.wagons.transferCloseShort,
+    FREIGHT_PERMS.wagons.transferFulfill,
+  ]);
+
 /** Org-administration endpoints (user mgmt, billing config, company CRUD, settings). */
 export const FreightAdmin = () => BookingStaff(FREIGHT_PERMS.admin);