Function update

webapp/_webapp/src/hooks/useThemeSync.ts:41–41

()

    // themeMode === "auto": follow system
    const media = window.matchMedia("(prefers-color-scheme: dark)");
    const update = () => applyTheme(media.matches);
    update();
    media.addEventListener("change", update);
    return () => media.removeEventListener("change", update);