- Rename fontCache.ts to collectionCache.ts
- Rename FontCacheManager interface to CollectionCacheManager
- Make implementation fully generic (already was, just renamed interface)
- Update exports in shared/fetch/index.ts
- Fix getStats() to return derived store value for accurate statistics
- Add comprehensive test coverage for collection cache manager
- 41 test cases covering all functionality
- Tests for caching, deduplication, state tracking
- Tests for statistics, reactivity, and edge cases
Closes task-1 of Phase 1 refactoring
