Upgrade React 17 to React 18

A step-by-step workflow for upgrading to React 18 and adopting new concurrent features.

## Steps:

1. Update dependencies: npm install react@18 react-dom@18 @types/react@18 @types/react-dom@18

2. Replace ReactDOM.render with createRoot in your entry file.

3. Ask Copilot: 'Identify components using deprecated React 17 patterns.'

4. Update automatic batching: review state updates that relied on synchronous batching.

5. Add useId() for SSR-safe unique IDs where needed.

6. Gradually adopt new features: Suspense for data fetching, startTransition for non-urgent updates.

7. Test thoroughly, especially SSR and Suspense boundaries.

8. Update third-party libraries that may have React 18 compatibility issues.