feat: establish frontend foundation

src/main.tsx

@@ -1,10 +1,18 @@
-import { StrictMode } from 'react'
-import { createRoot } from 'react-dom/client'
-import './index.css'
-import App from './App.tsx'
+import { StrictMode } from "react";
+import { createRoot } from "react-dom/client";
+import "@mantine/core/styles.css";
+import "./app/styles.css";
+import "./shared/i18n";
+import { App } from "./app";
 
-createRoot(document.getElementById('root')!).render(
-  <StrictMode>
-    <App />
-  </StrictMode>,
-)
+const root = document.getElementById("root");
+
+if (!root) {
+	throw new Error("Root element not found");
+}
+
+createRoot(root).render(
+	<StrictMode>
+		<App />
+	</StrictMode>,
+);