Version 1.2.0 - Token Authentication

New Features:
- Token-based authentication for better privacy and security
- Persistent login across browser sessions
- Multi-language support (English/Japanese)

Improvements:
- Updated icons to match web app branding
- Better error messages for quota limits
- Improved authentication callback page

This update replaces cookie-based authentication with secure token storage, ensuring your
login persists even with strict browser privacy settings.