Enhance overview and train scheduling features

- Updated OverviewContractsTabPanel to include a new donut chart for freight type distribution.
- Modified OverviewOperationsTabPanel to improve data visualization with additional charts and refactored data handling.
- Introduced CreateScheduleWindowFields component for configuring booking windows in train scheduling.
- Added new API endpoints for allocation candidates and booking allocation in trainScheduling.service.
- Enhanced BookingRequestsPage to support allocation of paid bookings with a modal for selecting alternative dates.
- Updated QUERY_KEYS and URLS constants to accommodate new operations and features.
- Improved type definitions for overview and train scheduling to support new functionalities.

apps/edr-freight-api/src/modules/train-scheduling/booking-notifier.service.ts

@@ -275,6 +275,19 @@ export class BookingNotifierService {
     this.inApp(b, 'Booking rescheduled', msg);
   }
 
+  /**
+   * Staff placed a paid booking onto a train departing on a DIFFERENT day than
+   * the customer's original choice. In-app only — staff drove the change and
+   * the allocation itself already notifies through the secured path.
+   */
+  allocatedOtherDay(b: Booking, newDeparture: Date): void {
+    const when = newDeparture.toLocaleDateString('en-GB', { timeZone: BATCH_TIMEZONE });
+    const msg =
+      `Booking ${b.reference ?? b.id} has been allocated to a train on a different date. ` +
+      `New departure date: ${when}.`;
+    this.inApp(b, 'Booking allocated to another date', msg);
+  }
+
   /**
    * Booking was removed from its train during a staff reschedule (not a government
    * pre-empt). It returns to eligible — the customer must rebook or reschedule.