Implements the Activity Feed scene for the Einundzwanzig Portal
presentation video. Features include:
- 3D perspective entrance animation with smooth transitions
- "Aktivitäten" header with pulsing LIVE indicator
- 4 activity items with staggered slide-in animations:
- EINUNDZWANZIG Kempten (vor 13 Stunden)
- EINUNDZWANZIG Darmstadt (vor 21 Stunden)
- EINUNDZWANZIG Vulkaneifel (vor 2 Tagen)
- BitcoinWalk Würzburg (vor 2 Tagen)
- "Neuer Termin" badge with bounce animation
- Audio: button-click.mp3 per item, slide-in.mp3 for entrance
- Uses existing ActivityItem component for consistent styling
- Comprehensive test suite with 24 tests
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
