refactor: Migrate auth layout to server-side redirection with improved layout structure

src/app/(auth)/layout.tsx

@@ -1,27 +1,24 @@
-"use client";
+import { redirect } from "next/navigation";
 
-import { useEffect } from "react";
-import { useRouter } from "next/navigation";
-import { useSession } from "next-auth/react";
+import { getCurrentUser } from "@/lib/session";
 
-export default function AuthLayout({
+export default async function AuthLayout({
   children,
 }: {
   children: React.ReactNode;
 }) {
-  const { data: session, status } = useSession();
-  const router = useRouter();
+  const user = await getCurrentUser();
 
-  useEffect(() => {
-    if (status === "authenticated") {
-      if (session?.user?.role === "ADMIN") {
-        router.push("/admin");
-      } else {
-        router.push("/dashboard");
-      }
-      router.refresh();
-    }
-  }, [session, status, router]);
+  if (user) {
+    if (user.role === "ADMIN") redirect("/admin");
+    redirect("/dashboard");
+  }
 
-  return <>{children}</>;
+  return (
+    <div className="min-h-screen">
+      <div className="flex h-screen w-screen flex-col items-center justify-center">
+        {children}
+      </div>
+    </div>
+  );
 }