Build Vertex AI gateway landing page

hooks/use-mobile.ts

@@ -0,0 +1,18 @@
+import * as React from "react"
+
+const MOBILE_BREAKPOINT = 768
+const MOBILE_QUERY = `(max-width: ${MOBILE_BREAKPOINT - 1}px)`
+
+function subscribe(onStoreChange: () => void) {
+  const mql = window.matchMedia(MOBILE_QUERY)
+  mql.addEventListener("change", onStoreChange)
+  return () => mql.removeEventListener("change", onStoreChange)
+}
+
+export function useIsMobile() {
+  return React.useSyncExternalStore(
+    subscribe,
+    () => window.matchMedia(MOBILE_QUERY).matches,
+    () => false
+  )
+}