- Add kiwix-categories.json with Medicine category and 3 tiers
- Create CategoryCard component for displaying category cards
- Create TierSelectionModal for tier selection UI
- Integrate categories into Easy Setup wizard (Step 3)
- Add TypeScript types for categories and tiers
- Fallback to legacy flat collections if categories unavailable
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
