v0.2.7-rc1

Added

• Open Core next-plan document for the public roadmap after v0.2.6-rc2.
• Automated frontend i18n guard for translation key parity and hardcoded Polish runtime copy checks.
• Self-hosting readiness endpoint and Admin tab for app URL, access rules, email provider, SQLite data path, backup/restore scripts and current version.
• Repository-level Node version files and npm engine enforcement for Node 20 local development.

Changed

• Frontend runtime storage access now uses a safe wrapper for non-browser/test environments.
• Backend and frontend package metadata now declare Node >=20 <26.
• Backend test script now expands test files correctly.
• Admin email provider test failures now show safe diagnostics.

Fixed

• Frontend test setup now provides a memory-backed localStorage fallback.

Validation

• Node 20.20.2
• Backend lint/tests: 170 passing
• Frontend lint/tests/build: 47 passing