Install vitest, @vitest/coverage-v8, jsdom, @testing-library/react,
@testing-library/jest-dom, @testing-library/user-event, and msw.
Create vitest.config.ts with jsdom environment, path aliases, and
coverage configuration. Add test scripts to package.json and
vitest/globals types to tsconfig.app.json.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
