13-task plan covering:
- Delete old ProgressCardGenerator
- Create ShareableContent protocol and 8 theme presets
- Create shared card components (header, footer, stats, maps)
- Create generators for progress, trip, and achievement cards
- Create ShareService for Instagram and system sharing
- Create SharePreviewView and ShareButton
- Integrate into ProgressTabView, TripDetailView, AchievementsListView
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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