leonardomso / 33-js-concepts

- Complete IndexedDB documentation covering database operations, transactions, object stores, indexes, CRUD operations, cursors, and Promise wrappers - Add 22 tests covering utility functions and patterns - Include filing cabinet analogy with ASCII diagrams - Add storage comparison table (localStorage vs IndexedDB vs cookies) - Cover real-world patterns: sync queue, database helper class - Document common mistakes with fixes - SEO optimized with 93% score (28/30)