- Simplified loadPersistedVocabularyData() to use only VocabularyProgressManager
- Updated calculateVocabularyProgress() to use unified data structure
- Removed old system references from knowledge panel data loading
- Fixed field names (drsDiscovered, drsMastered) for unified system
- Knowledge panel now displays vocabulary progress correctly
✅ TESTED: Vocabulary Knowledge panel working with unified system
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
