- Changed default AUTH_TYPE in backend configuration to "LOCAL".
- Updated frontend environment configuration to reflect the new default for packaged clients.
- Adjusted runtime authentication resolution to use "LOCAL" as the fallback value.
- Updated .env.example to include new environment variables for Google authentication and global announcement settings.
- Integrated Google sign-in functionality in SignInButton and HeroSection components, allowing users to log in with their Google accounts.
- Added GlobalAnnouncement component to display maintenance notices or announcements on the homepage layout.
- Enhanced styling for Google sign-in buttons to improve user experience.
