Tested KeyCloak validation - AUTH

Test Keycloak JWT validation against access token issued via NextAuth; ensure Spring Boot resource server correctly validates token signature, expiration, issuer, and optional audience.

frontend/src/app/client/page.tsx

@@ -0,0 +1,35 @@
+"use client";
+
+import Link from "next/link";
+import { useSession } from "next-auth/react";
+
+export default function ClientSessionPage() {
+	const { data: session, status } = useSession();
+
+	return (
+		<main className="mx-auto flex min-h-screen w-full max-w-4xl flex-col gap-6 px-6 py-20">
+			<h1 className="text-3xl font-semibold tracking-tight">/client session example</h1>
+			<p className="text-sm text-zinc-600 dark:text-zinc-300">This page reads session in the browser with useSession(). Access token and ID token are not exposed here.</p>
+
+			<div className="rounded-xl border border-black/10 p-6 dark:border-white/20">
+				{status === "loading" ? (
+					<p className="text-sm">Loading session…</p>
+				) : session ? (
+					<pre className="overflow-x-auto text-sm">{JSON.stringify(session, null, 2)}</pre>
+				) : (
+					<p className="text-sm">No active session.</p>
+				)}
+			</div>
+
+			<div className="flex gap-3">
+				<Link className="rounded-md border border-black/10 px-4 py-2 text-sm dark:border-white/20" href="/">
+					Home
+				</Link>
+				<Link className="rounded-md border border-black/10 px-4 py-2 text-sm dark:border-white/20" href="/server">
+					Server example
+				</Link>
+			</div>
+		</main>
+	);
+}
+