enhance booking window logic to support overnight desk configurations and update related UI components

apps/edr-freight-api/src/modules/train-scheduling/batch-window.util.ts

@@ -165,9 +165,9 @@ export function isRoundTheClock(hours: OfficeHours): boolean {
  * Returns `null` when the next open would fall on/after `departure` — the train
  * leaves before another cycle could run, so the window is done.
  *
- * Precondition: `windowCloseHour >= windowOpenHour` — the desk runs within a
- * single EAT day and never wraps past midnight (enforced when global rules are
- * saved). openHour === closeHour is the 24-hour desk, handled first.
+ * The desk may run within one EAT day (`closeHour > openHour`), round the clock
+ * (`openHour === closeHour`), or overnight across midnight (`openHour >
+ * closeHour`, e.g. 08:00 → 07:00). `officeHoursOpen` handles all three.
  */
 /**
  * The EAT instant a booking cycle would open if it became ready at `readyAt`,
@@ -189,6 +189,19 @@ export function officeHoursOpen(readyAt: Date, hours: OfficeHours): Date {
   const readyMinutes = hour * 60 + minute;
   const openMinutes = hours.windowOpenHour * 60;
   const closeMinutes = hours.windowCloseHour * 60;
+
+  if (hours.windowOpenHour > hours.windowCloseHour) {
+    // Overnight desk, e.g. open 08:00 → close 07:00 next morning. The desk is
+    // open across midnight: [openHour, 24:00) on this EAT day and [00:00,
+    // closeHour) on the next. Only the daytime gap [closeHour, openHour) is shut.
+    if (readyMinutes >= openMinutes || readyMinutes < closeMinutes) {
+      // Inside the overnight window (either side of midnight) → open when ready.
+      return readyAt;
+    }
+    // In the daytime gap → the desk opens again at openHour this EAT morning.
+    return eatDayToUtc(eatDay(readyAt), hours.windowOpenHour);
+  }
+
   if (readyMinutes < openMinutes) {
     // Ready before the desk opens on its own EAT calendar day → open this morning.
     return eatDayToUtc(eatDay(readyAt), hours.windowOpenHour);