dirty but the initial concept is working

src/frontend.tsx

@@ -0,0 +1,26 @@
+/**
+ * This file is the entry point for the React app, it sets up the root
+ * element and renders the App component to the DOM.
+ *
+ * It is included in `src/index.html`.
+ */
+
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import { App } from "./App";
+
+const elem = document.getElementById("root")!;
+const app = (
+  <StrictMode>
+    <App />
+  </StrictMode>
+);
+
+if (import.meta.hot) {
+  // With hot module reloading, `import.meta.hot.data` is persisted.
+  const root = (import.meta.hot.data.root ??= createRoot(elem));
+  root.render(app);
+} else {
+  // The hot module reloading API is not available in production.
+  createRoot(elem).render(app);
+}