chore: import upstream snapshot with attribution

apps/webapp/app/hooks/useInitialDimensions.ts

@@ -0,0 +1,13 @@
+import { useEffect, useState } from "react";
+
+export function useInitialDimensions(ref: React.RefObject<HTMLElement>) {
+  const [dimensions, setDimensions] = useState<DOMRectReadOnly | null>(null);
+
+  useEffect(() => {
+    if (ref.current) {
+      setDimensions(ref.current.getBoundingClientRect());
+    }
+  }, [ref]);
+
+  return dimensions;
+}