frontend/react/src/main.jsx

import React from "react";
import { createRoot } from "react-dom/client";
import App from "./App";
import "./styles.css";

const rootEl = document.getElementById("app-root");
if (!rootEl) {
  throw new Error("Missing #app-root mount node");
}

createRoot(rootEl).render(
  <React.StrictMode>
    <App />
  </React.StrictMode>,
);