feat: bootstrap walking skeleton

src/main.tsx

@@ -0,0 +1,15 @@
+import { StrictMode } from 'react';
+import { createRoot } from 'react-dom/client';
+import './index.css';
+import { App } from './ui/App';
+
+const root = document.getElementById('root');
+if (!root) {
+  throw new Error('Root element #root not found');
+}
+
+createRoot(root).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+);