f08a86c453
- Implement NotFoundPage with required test IDs for 404 error page - Add data-testids: error-404-title, error-message, back-button, home-link, error-heading - Fix Cypress baseUrl config from 3003/components to localhost:3001 - Clean up .js files in pages directory (keep only .tsx) - App passes Task 1.1 requirements (404 page structure complete)