async function logout() {
    // Panggil PHP untuk hapus session (opsional)
    await fetch("http://localhost/Kelompok06_2048/Logout.php", {
        method: "POST"
    });

    // Hapus token & username dari localStorage
    localStorage.removeItem("authToken");
    localStorage.removeItem("username");

    window.location.href = "Homepage.html";
}