v2.5.0 - Authentication UX Improvements

Register Page:
- Enhanced copy button with clipboard API fallback
- Critical warning moved to top with animations
- Toast notifications for user feedback
- Improved visual hierarchy

Login Page:
- Redesigned Access Work button with gradient
- Added icon and hover effects
- Better visual prominence

Authentication:
- Proper hash validation and state persistence
- Session restoration on page refresh
- Zustand persist integration
- Fixed 'not logged in' issue after login

Addresses user feedback on authentication flow.