feat(pos): default the pay sheet to Card

Card is now the pre-selected payment method (and split rows default to Card),
matching Iran's card-dominant payments. Card already sits first in the selector.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

web/dashboard/src/components/pos2/pos2-screen.tsx

@@ -688,10 +688,10 @@ function Pos2PaySheet({
   onClose: () => void;
   onConfirm: (payments: Payment[], loyaltyRedeem: number) => void;
 }) {
-  const [method, setMethod] = useState<"cash" | "card" | "split">("cash");
+  const [method, setMethod] = useState<"cash" | "card" | "split">("card");
   const [recv, setRecv] = useState("");
   const [splitN, setSplitN] = useState(2);
-  const [splitMethods, setSplitMethods] = useState<Method[]>(["Cash", "Cash"]);
+  const [splitMethods, setSplitMethods] = useState<Method[]>(["Card", "Card"]);
   const [useLoyalty, setUseLoyalty] = useState(false);
 
   useEffect(() => {