feat(freight-web): restrict booking currency to ETB and portal ETB payments to CBE bill only

packages/ui-common/src/components/CurrencySelector/CurrencySelector.tsx

@@ -10,18 +10,13 @@ export interface CurrencySelectorProps {
   error?: string;
 }
 
+// ponytail: ETB-only for now — restore the USD entry when multi-currency billing returns.
 const OPTIONS = [
-  {
-    code: "USD",
-    symbol: "$",
-    name: "US Dollar",
-    hint: "As quoted on the contract",
-  },
   {
     code: "ETB",
     symbol: "Br",
     name: "Ethiopian Birr",
-    hint: "Converted from the USD total",
+    hint: "All shipments are invoiced in ETB",
   },
 ] as const;