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/migrations/2930000000000-AddWagonTransferPartialFulfilment.ts

@@ -0,0 +1,40 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Partial wagon-transfer fulfilment.
+ *
+ * A request for 50 wagons no longer has to be met in one go: OCC moves what the
+ * source yard can spare, whenever it can, and the request stays open until the
+ * full count is met (FULFILLED) or OCC ends it short (CLOSED_SHORT) so the
+ * requester can ask another yard for the rest.
+ *
+ * Existing rows are back-filled so history keeps reading correctly: a FULFILLED
+ * request delivered its whole quantity; anything else delivered nothing.
+ */
+export class AddWagonTransferPartialFulfilment2930000000000
+  implements MigrationInterface
+{
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.wagon_transfer_requests
+        ADD COLUMN IF NOT EXISTS fulfilled_quantity integer NOT NULL DEFAULT 0,
+        ADD COLUMN IF NOT EXISTS closed_short_at timestamptz NULL,
+        ADD COLUMN IF NOT EXISTS closed_short_by_user_id uuid NULL
+    `);
+    await queryRunner.query(`
+      UPDATE freight.wagon_transfer_requests
+         SET fulfilled_quantity = quantity
+       WHERE status = 'FULFILLED'
+         AND fulfilled_quantity = 0
+    `);
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(`
+      ALTER TABLE freight.wagon_transfer_requests
+        DROP COLUMN IF EXISTS fulfilled_quantity,
+        DROP COLUMN IF EXISTS closed_short_at,
+        DROP COLUMN IF EXISTS closed_short_by_user_id
+    `);
+  }
+}