v0.7.0 — Swedish localization + translation parity check

Added

• Swedish localization (sv). New src/locales/sv.json with full parity to en.json (114 keys). Thanks to @andreascarnesten in #2.

Changed

• Translation parity check. New scripts/check-translations.js (run via npm run check:translations) verifies that every locale file matches en.json (no missing or extra keys) and is registered in src/translations.js. A GitHub Actions workflow (.github/workflows/translations.yaml) runs this check on every PR touching translation files, so missing wiring or stale locales can't ship unnoticed.