Enhance contract management by adding booking windows section and updating invoice logic for offloaded cargo

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

@@ -646,7 +646,9 @@ function FinalInvoiceStep({
   const invoice = clearance.finalInvoice ?? null;
   const paid = invoice?.status === "PAID";
 
-  if (!clearance.offloaded && !invoice) {
+  // Export: OFFLOADED is a DJ doc milestone that may never be recorded, so the
+  // secured gate pass is enough to open invoicing. Sending an invoice is optional.
+  if (!clearance.offloaded && !clearance.gatepassGranted && !invoice) {
     return (
       <StepStatus
         done={false}
@@ -740,7 +742,7 @@ function FinalInvoiceStep({
       ) : canDjAct && bookingId ? (
         <>
           <Text size="sm" c="dimmed">
-            Cargo offloaded — send the final invoice to the customer.
+            Send the final invoice to the customer if post-arrival charges apply (optional).
           </Text>
           <Button
             color="edr-green"