vitest was collecting the dockerized integration Playwright specs (run via
`npm run test:integration`) and the untracked examples/ sample code, which
fail under the vitest runner. Exclude both so `npm test` only runs the unit
suite.
- Add 18 missing translation keys to all non-English locales (de, es, fr, it, ja, nl, pt) with English fallback values
- Fix contact form submit test targeting prefix input instead of given_name
- Exclude .next/ build output from vitest to prevent Playwright spec conflicts
Linus Rath