AuthForm enhancements:
- Add form-wide error display with dismiss functionality
- Add field-specific error styling with icons
- Auto-clear errors when user starts typing
- Enhanced accessibility with semantic announcements
- Better error positioning and visual hierarchy
AuthButton enhancements:
- Convert to StatefulWidget with animation support
- Add success state with visual feedback
- Enhanced loading states with custom text
- Double-tap prevention for better UX
- Haptic feedback on button press
- Comprehensive accessibility labels and hints
- Smooth visual transitions between states
- Better disabled state handling
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