Add the split-screen auth shell and its card components

web/frontend/app/features/auth/components/AuthErrorAlert.tsx

@@ -0,0 +1,11 @@
+interface AuthErrorAlertProps {
+    message: string;
+}
+
+const AuthErrorAlert = ({ message }: AuthErrorAlertProps) => (
+    <div role="alert" className="alert alert-error alert-soft">
+        <span>{message}</span>
+    </div>
+);
+
+export default AuthErrorAlert;