add reference field to train schedules and implement unique sequence generation

apps/edr-freight-web/backoffice/src/components/contracts/GlUpcomingWindowsSection.tsx

@@ -29,6 +29,7 @@ import { api } from "@/services/api";
  */
 interface WindowRow {
   scheduleId: string;
+  reference?: string | null;
   trainNumber?: string | null;
   direction: string | null;
   windowPhase: string | null;
@@ -195,6 +196,11 @@ function WindowCard({ w }: { w: WindowRow }) {
               {w.destination ?? "—"}
             </Text>
           </Group>
+          {w.reference ? (
+            <Text fz={12} fw={600} ff="monospace" c="edr-green.7" truncate>
+              {w.reference}
+            </Text>
+          ) : null}
           {w.trainNumber ? (
             <Text fz={12} c="dimmed" truncate>
               Train {w.trainNumber}