Implemented TDD approach for highlight persistence:
- Created IndexedDB store with 'highlights' object store
- Added indexes for syncStatus and verseId for efficient queries
- Implemented CRUD operations: add, update, get, getAll, delete
- Added query methods: getHighlightsByVerse, getPendingHighlights
- Full test coverage with fake-indexeddb mock
- Added structuredClone polyfill for test environment
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Co-Authored-By: Claude <noreply@anthropic.com>
Andrei
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