- Add jsdom, @testing-library/react, @testing-library/jest-dom, vite-tsconfig-paths
- Update vitest.config.ts with jsdom environment, react and tsconfigPaths plugins
- Create src/test/setup.ts with cleanup and jest-dom matchers
- Add vitest/globals type to tsconfig.json
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>