proposal-system/web/src/main.tsx

import React from 'react';
import ReactDOM from 'react-dom/client';
import { BrowserRouter } from 'react-router-dom';
import { Provider } from 'react-redux';
import { QueryClientProvider } from '@tanstack/react-query';
import { ThemeProvider, CssBaseline } from '@mui/material';
import { ToastContainer } from 'react-toastify';
import 'react-toastify/dist/ReactToastify.css';
import './styles/globals.css';
import './index.css';
import { store } from './app/store';
import { queryClient } from './lib/queryClient';
import { theme } from './theme';
import App from './App';

ReactDOM.createRoot(document.getElementById('root')!).render(
  <React.StrictMode>
    <Provider store={store}>
      <QueryClientProvider client={queryClient}>
        <ThemeProvider theme={theme}>
          <CssBaseline />
          {/* Fix: WEB-M13 — ToastContainer inside BrowserRouter so toasts render in the correct React tree */}
          <BrowserRouter>
            <App />
            <ToastContainer position="bottom-right" autoClose={4000} />
          </BrowserRouter>
        </ThemeProvider>
      </QueryClientProvider>
    </Provider>
  </React.StrictMode>
);