add company stamp upload functionality for contract signing

- Introduced StampUpload component for uploading company stamp images.
- Integrated stamp upload in contract signing modal, supporting PNG and JPG formats.
- Implemented validation for file type and size (max 5 MB).
- Added visual feedback for drag-and-drop functionality.
- Updated contract-related pages to handle duplicate contract alerts and pricing notices.
- Enhanced contract expiry management with a nightly sweep service.
- Added unit tests for new features and updated existing tests for contract handling.

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

@@ -6659,6 +6659,8 @@ export class TrainSchedulingService {
         : slot.physicalWagonId ?? null;
       if (physicalId) coveredPhysicalIds.add(physicalId);
     }
+    // Fallback only — real empty rows below carry the wagon's OWN physical
+    // sequenceNumber, not an invented tail position (see emptyConsistWagons).
     const maxSlotSequenceNo = Math.max(
       0,
       ...(schedule.trainSet?.wagons ?? []).map((w) => w.sequenceNo),
@@ -6669,7 +6671,11 @@ export class TrainSchedulingService {
         // Physical wagon id — there is no TrainSetWagon slot behind this
         // row, so remove/edit affordances must stay disabled (consistOnly).
         id: wagon.id,
-        sequenceNo: maxSlotSequenceNo + index + 1,
+        // The wagon's REAL coupling position, so an empty wagon in the middle
+        // of the train draws in the middle — not appended after every loaded
+        // slot. Falls back to a tail position only if the wagon somehow has
+        // no sequence number of its own.
+        sequenceNo: wagon.sequenceNumber ?? maxSlotSequenceNo + index + 1,
         capacityTons: roundTons(Number(wagon.wagonType?.capacityTons ?? 0)),
         lengthMeters: roundTons(Number(wagon.wagonType?.lengthMeters ?? 0)),
         assignedWeightTons: 0,
@@ -6779,8 +6785,7 @@ export class TrainSchedulingService {
               maxPullWeightTons: roundTons(Number(loco.maxPullWeightTons)),
               maxTrainLengthMeters: roundTons(Number(loco.maxTrainLengthMeters)),
             })),
-            wagons: [...(schedule.trainSet.wagons ?? [])]
-              .sort((a, b) => a.sequenceNo - b.sequenceNo)
+            wagons: (schedule.trainSet.wagons ?? [])
               .map((wagon) => {
                 // Frozen schedules read the wagon number + allocations from the
                 // snapshot slot; the immutable slot geometry (capacity/type) still
@@ -6788,9 +6793,20 @@ export class TrainSchedulingService {
                 const frozenSlot = isWagonAllocationFrozen
                   ? snapshotSlotByTrainSetWagonId.get(wagon.id)
                   : undefined;
+                // Draw the slot at its physical wagon's REAL coupling position,
+                // not the planning-time slot index — the two diverge once a
+                // load has been dragged onto a different wagon (moveWagonLoad
+                // repoints physicalWagonId but a slot keeps its own sequenceNo),
+                // or once wagon types were interleaved at pinning time. Frozen
+                // and not-yet-pinned slots have no live physical wagon to trust,
+                // so they keep their own slot sequence.
+                const sequenceNo =
+                  frozenSlot || !wagon.physicalWagon
+                    ? wagon.sequenceNo
+                    : (wagon.physicalWagon.sequenceNumber ?? wagon.sequenceNo);
                 return {
                   id: wagon.id,
-                  sequenceNo: wagon.sequenceNo,
+                  sequenceNo,
                   capacityTons: roundTons(Number(wagon.capacityTons)),
                   lengthMeters: roundTons(Number(wagon.lengthMeters)),
                   assignedWeightTons: roundTons(Number(wagon.assignedWeightTons)),
@@ -6859,7 +6875,12 @@ export class TrainSchedulingService {
                       })) ?? [],
                 };
               })
-              .concat(emptyConsistWagons),
+              .concat(emptyConsistWagons)
+              .sort((a, b) =>
+                schedule.reverseWagonOrder
+                  ? b.sequenceNo - a.sequenceNo
+                  : a.sequenceNo - b.sequenceNo,
+              ),
           }
         : null,
       bookings: