feature: put react app in strict mode

front/src/index.tsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import React, { StrictMode } from 'react';
 import ReactDOM from 'react-dom/client';
 import './index.css';
 import App from './App';
@@ -14,7 +14,9 @@ const root = ReactDOM.createRoot(
 root.render(
   <ApolloProvider client={apiClient}>
     <BrowserRouter>
-      <App />
+      <StrictMode>
+        <App />
+      </StrictMode>
     </BrowserRouter>
   </ApolloProvider>,
 );