- Restore FOREGROUND_SERVICE permission for beacon scanning
- Remove FOREGROUND_SERVICE_LOCATION (no video required)
- Update all SnackBars to Payfrit green (#90EE90) with black text
- Float SnackBars with 80px bottom margin to avoid buttons
- Add signup screen with OTP verification flow
- Fix build.gradle.kts to use Flutter version system
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
