feat(train): enhance train history and scheduling features

- Added a reason field to train history entries for detach/maintenance actions.
- Updated TrainHistoryPanel to display the reason for wagon detachments.
- Introduced per-wagon load/unload functionality in ScheduleWorkspacePanel with a modal for managing individual wagons.
- Implemented API endpoints for loading and unloading specific wagons, including the ability to cancel remaining wagons with a reason.
- Refactored detach request handling in TrainBuilderDetailPage to streamline the process and remove the approval flow, requiring a reason for detachments.
- Updated types and services to support new wagon loading/unloading features and booking wagon retrieval.

apps/edr-freight-api/src/migrations/3760000000000-PerWagonLoading.ts

@@ -0,0 +1,65 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Per-wagon loading. Staff may confirm loading wagon-by-wagon instead of the
+ * whole booking at once:
+ *  - bookings.loading_started_at — first wagon loaded; the booking stays PAID
+ *    until every remaining wagon is LOADED (remaining = allocated − cancelled).
+ *    Also shields a mid-load booking from the dispatch "left behind" unassign.
+ *  - wagon_booking_allocations.loaded_at / loaded_by_user_id — per-wagon
+ *    confirmation audit.
+ *  - booking_wagon_cancellations.fault — who caused an at-loading cancel of
+ *    the never-loaded remainder: CUSTOMER (fee applies) or EDR (no fee, credit
+ *    rebookable in full).
+ */
+export class PerWagonLoading3760000000000 implements MigrationInterface {
+  name = 'PerWagonLoading3760000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE freight.bookings
+         ADD COLUMN IF NOT EXISTS loading_started_at timestamptz`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations
+         ADD COLUMN IF NOT EXISTS loaded_at timestamptz`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations
+         ADD COLUMN IF NOT EXISTS loaded_by_user_id uuid`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations
+         ADD COLUMN IF NOT EXISTS unloaded_at timestamptz`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations
+         ADD COLUMN IF NOT EXISTS unloaded_by_user_id uuid`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.booking_wagon_cancellations
+         ADD COLUMN IF NOT EXISTS fault varchar(16)`,
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE freight.booking_wagon_cancellations DROP COLUMN IF EXISTS fault`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations DROP COLUMN IF EXISTS loaded_by_user_id`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations DROP COLUMN IF EXISTS unloaded_by_user_id`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations DROP COLUMN IF EXISTS unloaded_at`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.wagon_booking_allocations DROP COLUMN IF EXISTS loaded_at`,
+    );
+    await queryRunner.query(
+      `ALTER TABLE freight.bookings DROP COLUMN IF EXISTS loading_started_at`,
+    );
+  }
+}

apps/edr-freight-api/src/migrations/3770000000000-WagonAdjustmentReason.ts

@@ -0,0 +1,27 @@
+import { MigrationInterface, QueryRunner } from 'typeorm';
+
+/**
+ * Why a wagon left (or joined) the consist, on the adjustment log itself.
+ *
+ * SCHEDULED-run detach / send-to-maintenance now requires a reason instead of
+ * a second staffer's approval, so the reason has to read back where the change
+ * reads back: the train-builder History tab. Nullable — every other writer
+ * (trip cuts, couples, arrival returns) keeps logging without one.
+ */
+export class WagonAdjustmentReason3770000000000 implements MigrationInterface {
+  name = 'WagonAdjustmentReason3770000000000';
+
+  public async up(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE freight.schedule_wagon_adjustment_logs
+         ADD COLUMN IF NOT EXISTS reason varchar(500)`,
+    );
+  }
+
+  public async down(queryRunner: QueryRunner): Promise<void> {
+    await queryRunner.query(
+      `ALTER TABLE freight.schedule_wagon_adjustment_logs
+         DROP COLUMN IF EXISTS reason`,
+    );
+  }
+}