feat(train-scheduling): implement container movement between wagons

- Added functionality to move containers between wagons in the train scheduling system.
- Introduced  API endpoint and service method to handle container movement.
- Updated  component to support drag-and-drop for rearranging containers.
- Enhanced  to allow moving containers to other wagons via a context menu.
- Implemented UI feedback for container movement actions, including loading states and success/error notifications.
- Updated relevant types and constants to accommodate new container movement logic.
- Added tests for the rule engine to ensure proper handling of hazardous bookings.

apps/edr-freight-api/src/modules/train-scheduling/wagon-plan.util.ts

@@ -525,6 +525,40 @@ export function validateMixedTrainLimits(
   );
 }
 
+/**
+ * Leg-aware limit check: with a real stop list, a slot only counts on the
+ * edges it actually rides (boardYardId→alightYardId; null = the schedule's
+ * own endpoint). Each edge is validated as its own consist, so an intercity
+ * wagon on Gelan→Adama never counts against a train that is full only on
+ * Adama→Doraleh. Two stops (or fewer) degrade to the whole-train check.
+ */
+export function validateMixedTrainLimitsPerEdge(
+  wagonPlan: WagonPlanSlot[],
+  wagonTypes: Array<Pick<WagonType, 'lengthMeters'>>,
+  limits: TrainLimitConfig | undefined,
+  stops: string[],
+): string[] {
+  if (stops.length <= 2) return validateMixedTrainLimits(wagonPlan, wagonTypes, limits);
+  const lastIdx = stops.length - 1;
+  const spans = wagonPlan.map((slot) => {
+    const from = slot.boardYardId ? stops.indexOf(slot.boardYardId) : 0;
+    const to = slot.alightYardId ? stops.indexOf(slot.alightYardId) : lastIdx;
+    // A yard missing from the stop list keeps the slot on the whole route.
+    return { from: from >= 0 ? from : 0, to: to > 0 ? to : lastIdx };
+  });
+  const violations = new Set<string>();
+  for (let edge = 0; edge < lastIdx; edge += 1) {
+    const active = wagonPlan.filter(
+      (_, i) => spans[i].from <= edge && edge < spans[i].to,
+    );
+    if (!active.length) continue;
+    for (const violation of validateMixedTrainLimits(active, wagonTypes, limits)) {
+      violations.add(violation);
+    }
+  }
+  return [...violations];
+}
+
 export function validate20ftContainerRules(
   units: ContainerUnitRow[],
   placements: ContainerPlacementInput[],