fix: checkout page polish, metadata, and typescript fixes

app/checkout/layout.tsx

@@ -0,0 +1,8 @@
+export const metadata = {
+  title: 'Checkout — Pulse',
+  robots: 'noindex, nofollow',
+}
+
+export default function CheckoutLayout({ children }: { children: React.ReactNode }) {
+  return children
+}