feat: init waitlist website

Co-authored-by: Ona <no-reply@ona.com>

apps/waitlist-website/app/hooks/use-color-scheme.ts

@@ -0,0 +1,27 @@
+import { useEffect, useState } from "react"
+
+export const ColorScheme = {
+	Light: "light",
+	Dark: "dark",
+} as const
+export type ColorScheme = (typeof ColorScheme)[keyof typeof ColorScheme]
+
+export function useColorScheme(): ColorScheme {
+	const [scheme, setScheme] = useState<ColorScheme>(() => {
+		if (typeof window === "undefined") return ColorScheme.Light
+		return window.matchMedia("(prefers-color-scheme: dark)").matches
+			? ColorScheme.Dark
+			: ColorScheme.Light
+	})
+
+	useEffect(() => {
+		const mql = window.matchMedia("(prefers-color-scheme: dark)")
+		const handler = (e: MediaQueryListEvent) => {
+			setScheme(e.matches ? ColorScheme.Dark : ColorScheme.Light)
+		}
+		mql.addEventListener("change", handler)
+		return () => mql.removeEventListener("change", handler)
+	}, [])
+
+	return scheme
+}