Added authentication error page. (#76)

frontend/app/[locale]/(marketing)/auth/error/page.tsx

@@ -0,0 +1,38 @@
+'use client';
+import React from 'react';
+import { AlertCircle } from 'lucide-react';
+import { Card } from '@/components/ui/card';
+import { useRouter } from 'next/navigation';
+import { Button } from '@/components/ui/button';
+
+const AuthErrorPage = () => {
+    const router = useRouter();
+    return (
+        <div className="flex min-h-screen flex-col items-center justify-center">
+            <Card className="max-w-md w-full bg-white dark:bg-gray-800 shadow-lg rounded-lg overflow-hidden">
+                <div className="p-6 sm:p-8">
+                    <div className="flex items-center justify-center mb-6">
+                        <AlertCircle className="size-12 text-red-500" />
+                    </div>
+                    <h1 className="text-2xl sm:text-3xl font-bold text-center text-gray-900 dark:text-gray-100 mb-4">Authentication Error</h1>
+                    <p className="text-center text-gray-600 dark:text-gray-300 mb-6">
+                        We&apos;re sorry, but there was an error during the authentication process. Please try again or contact support if the issue persists.
+                    </p>
+                    <div className="mt-8 flex justify-center align-middle gap-2">
+                        <Button onClick={() => router.push('/login')} variant="default" size="lg">
+                            Login
+                        </Button>
+                        <Button onClick={() => router.push('/')} variant="ghost" size="lg">
+                            Back to Home
+                        </Button>
+                    </div>
+                </div>
+                <div className="bg-gray-100 dark:bg-gray-700 px-6 py-4">
+                    <p className="text-sm text-center text-gray-600 dark:text-gray-400">Error Code: AUTH_001 | Time: {new Date().toLocaleTimeString()}</p>
+                </div>
+            </Card>
+        </div>
+    );
+};
+
+export default AuthErrorPage;