build: add react vite scaffold

src/main.tsx

@@ -0,0 +1,13 @@
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import App from "./App";
+import "./app.css";
+
+const root = document.getElementById("root");
+if (!root) throw new Error("Missing React root element");
+
+createRoot(root).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);