Add debug hook

src/hooks/debug/useOnMount.ts

@@ -0,0 +1,8 @@
+import { useEffect } from "react";
+
+function useOnMount(name: string) {
+  // eslint-disable-next-line no-console
+  useEffect(() => console.log(`mounted node ${name}`), []);
+}
+
+export default useOnMount;