fix: use lowercase 'cod' in CODInstructions translation key

- Change useTranslations from Payment.COD to Payment.cod
- Fixes MISSING_MESSAGE error in CODInstructions component
- Consistent with translation file structure

src/components/payment/CODInstructions.tsx

@@ -8,7 +8,7 @@ interface CODInstructionsProps {
 }
 
 export function CODInstructions({ locale }: CODInstructionsProps) {
-  const t = useTranslations("Payment.COD");
+  const t = useTranslations("Payment.cod");
 
   const instructions = [
     {