https://nextjs.org/docs/messages/next-script-for-ga
pnpm add @next/third-parties
import { GoogleAnalytics } from '@next/third-parties/google'
export default function RootLayout({
children,
}: {
children: React.ReactNode
}) {
return (
<html lang="en">
<body>{children}</body>
<GoogleAnalytics gaId="G-XYZ" />
</html>
)
}