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

apps/edr-freight-web/backoffice/src/components/trainScheduling/BookingWindowSettingsModal.tsx

@@ -119,7 +119,9 @@ export default function BookingWindowSettingsModal({
   const canEdit = schedule?.windowPhase === "PRE_WINDOW";
   const is24h =
     form != null && form.windowOpenHour === form.windowCloseHour;
-  const closeBeforeOpen =
+  // Close < open is a valid OVERNIGHT desk (e.g. 08:00 → 07:00 next morning),
+  // not an error — the engine wraps it across midnight.
+  const isOvernight =
     form != null && form.windowCloseHour < form.windowOpenHour;
 
   const reopenSummary = useMemo(() => {
@@ -156,15 +158,6 @@ export default function BookingWindowSettingsModal({
       });
       return;
     }
-    if (closeBeforeOpen) {
-      toast({
-        title: "Close hour must be on or after the open hour",
-        description: "Set them equal for a 24-hour desk.",
-        variant: "destructive",
-      });
-      return;
-    }
-
     const payload: UpdateScheduleWindowRulePayload = {
       windowOpenHour: form.windowOpenHour,
       windowCloseHour: form.windowCloseHour,
@@ -282,10 +275,15 @@ export default function BookingWindowSettingsModal({
                 }
                 allowDeselect={false}
                 comboboxProps={{ withinPortal: true }}
-                error={closeBeforeOpen ? "Must be ≥ open hour" : undefined}
                 disabled={isExport}
               />
             </Group>
+            {isOvernight && !is24h ? (
+              <Text size="xs" c="dimmed" mt={4}>
+                Overnight desk — opens {form.windowOpenHour}:00 and runs past
+                midnight, closing {form.windowCloseHour}:00 the next morning.
+              </Text>
+            ) : null}
             <Switch
               mt="sm"
               size="sm"
@@ -394,11 +392,7 @@ export default function BookingWindowSettingsModal({
             <Button variant="default" onClick={onClose} disabled={save.isPending}>
               Cancel
             </Button>
-            <Button
-              onClick={handleSave}
-              loading={save.isPending}
-              disabled={closeBeforeOpen}
-            >
+            <Button onClick={handleSave} loading={save.isPending}>
               Save settings
             </Button>
           </Group>