export function observeThemeChange(
  callback: (isDark: boolean) => void,
): () => void {
  const observer = new MutationObserver(() => {
    callback(document.documentElement.classList.contains("dark"));
  });
  observer.observe(document.documentElement, {
    attributes: true,
    attributeFilter: ["class"],
  });
  return () => observer.disconnect();
}