feat(site): hide global chrome on landing pages

The index, login and register render their own AuthTopBar, so the shared
TopHeader / SiteHeader banner / Navigation duplicated the same chrome. Hide the
global chrome on those three standalone landing pages only.

src/app/(site)/layout.tsx

@@ -1,4 +1,5 @@
 import dynamic from "next/dynamic";
+import { headers } from "next/headers";
 import { NextIntlClientProvider } from "next-intl";
 import { getLocale, getMessages } from "next-intl/server";
 import type { ReactNode } from "react";
@@ -34,28 +35,43 @@ export default async function SiteLayout({
 }: {
 	children: ReactNode;
 }) {
-	const [session, locale, messages] = await Promise.all([
+	const [session, locale, messages, h] = await Promise.all([
 		auth(),
 		getLocale(),
 		getMessages(),
+		headers(),
 	]);
 	const clientMessages = publicClientMessages(messages);
 
+	// The landing pages render their own AuthTopBar (logo + live online), so the
+	// global site banner / navigation is hidden there to keep them clean and
+	// avoid showing the same chrome twice. Everything else keeps the chrome.
+	const pathname = h.get("x-pathname");
+	const isLandingPage =
+		pathname === "/" || pathname === "/login" || pathname === "/register";
+
 	return (
 		<NextIntlClientProvider locale={locale} messages={clientMessages}>
 			<CloudsField />
 			{/* Site chrome is public: hiding it all for anonymous visitors used to
 			    strand them — from /news, /leaderboard or /shop there was no way to
-			    reach any other page at all. */}
+			    reach any other page at all. Only the standalone landing pages opt
+			    out, because they carry their own header. */}
+			{!isLandingPage && (
 				<div data-theme-block="top_header">
 					<TopHeader session={session} />
 				</div>
+			)}
+			{!isLandingPage && (
 				<div data-theme-block="site_header">
 					<SiteHeader />
 				</div>
+			)}
+			{!isLandingPage && (
 				<div data-theme-block="navigation">
 					<Navigation session={session} />
 				</div>
+			)}
 			<main>
 				<div
 					data-theme-block="content_grid"