chore(demo): add loading state on sign in button

demo/nextjs/components/sign-in.tsx

@@ -17,12 +17,14 @@ import { Loader2 } from "lucide-react";
 import { signIn } from "@/lib/auth-client";
 import Link from "next/link";
 import { cn } from "@/lib/utils";
+import { useRouter } from "next/navigation";
 
 export default function SignIn() {
 	const [email, setEmail] = useState("");
 	const [password, setPassword] = useState("");
 	const [loading, setLoading] = useState(false);
 	const [rememberMe, setRememberMe] = useState(false);
+	const router = useRouter();
 
 	return (
 		<Card className="max-w-md rounded-none">
@@ -81,7 +83,16 @@ export default function SignIn() {
 						className="w-full"
 						disabled={loading}
 						onClick={async () => {
-							await signIn.email({ email, password });
+							setLoading(true);
+							await signIn.email(
+								{ email, password, rememberMe: rememberMe ? true : false },
+								{
+									onSuccess(context) {
+										router.push("/dashboard");
+									},
+								},
+							);
+							setLoading(false);
 						}}
 					>
 						{loading ? <Loader2 size={16} className="animate-spin" /> : "Login"}