GoalCheck (base) v0.6.1 — full UI translation

GoalCheck (base) v0.6.1 — i18n completion for the calm edition.

✨ New

• Full UI translation — English, हिन्दी, Español, Deutsch, switchable in Settings → Language (auto-detected on first visit). Catalogs are compile-enforced key-complete (721 keys), so translations can never silently miss strings.
• 92 unit + 14 E2E tests green in CI.

Want calendar/roadmap views, Deep Focus, RPG gamification, habits, importers, weekly review and the rest? That's GoalCheck Advance — same storage schema, switch anytime without losing data: advance releases.

🔐 Privacy

• Unchanged: no account, no network, no telemetry — all data stays on your device.

Full changes: CHANGELOG.md