Add backend and frontend

frontend/src/utils/resize-hook.ts

@@ -0,0 +1,16 @@
+import React from 'react';
+
+export const useResize = <T extends HTMLElement = HTMLElement>(
+  onResize: () => void,
+) => {
+  const ref = React.useRef<T>(null);
+  React.useEffect(() => {
+    if (ref.current) {
+      const observer = new ResizeObserver(onResize);
+      observer.observe(ref.current);
+      return () => observer.disconnect();
+    }
+    return () => undefined;
+  }, [ref.current]);
+  return ref;
+};