fix: suppress hydration warning on html for theme-init class

theme-init.js adds the 'dark' class to <html> before React hydrates,
causing a hydration mismatch (React #418) for users with a saved dark
theme. Mark the root element with suppressHydrationWarning.

src/app/layout.tsx

@@ -52,7 +52,7 @@ export default async function RootLayout({
 	const nonce = (await headers()).get("x-nonce") ?? undefined;
 
 	return (
-		<html lang={locale} className="app">
+		<html lang={locale} className="app" suppressHydrationWarning>
 			<head>
 				<meta name="theme-default-dark" content={String(defaultDark)} />
 				<link rel="preconnect" href="https://fonts.googleapis.com" />