add usd for import

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

@@ -348,6 +348,9 @@ export default function GlCreateBookingForm() {
   // Intercity shipments ride a passing import/export train staff pick at
   // finalize time — no shipment day is chosen and no window gate applies.
   const isIntercity = contract?.tradeDirection === "DOMESTIC";
+  // USD billing is offered on import traffic only — export and domestic
+  // shipments are always invoiced in ETB.
+  const isImport = contract?.tradeDirection === "IMPORT";
 
   // ONE_TIME split-remainder mode: a previous booking on this contract was
   // split on train capacity, so the capacity endpoint reports the outstanding
@@ -1757,12 +1760,15 @@ export default function GlCreateBookingForm() {
               Billing currency
             </Text>
             <Text size="xs" c="dimmed" mb={8}>
-              Shipments are invoiced in ETB.
+              {isImport
+                ? "Import shipments may be invoiced in ETB or USD. USD is paid by bank transfer, not online."
+                : "Shipments are invoiced in ETB."}
             </Text>
             <CurrencySelector
               value={isIntercity ? "ETB" : paymentCurrency}
               onChange={setPaymentCurrency}
               disabled={isIntercity}
+              allowUsd={isImport}
             />
           </Box>