- Created PortraitCaptureActivity that extends CaptureActivity
- Registered it in AndroidManifest.xml with screenOrientation="portrait"
- Updated JoinKeygenScreen and CoSignJoinScreen to use the portrait activity
- Also simplified keygen join logic to match Electron exactly
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>