Create Educational Docs

Required Document Structure: The final document MUST start with a header containing the title and the current date (e.g., Created: YYYY-MM-DD), followed by the following chapters:

Chapter 1: High-Level Architecture

• Explain the Client-Server model (React Frontend + Node/Express Backend).
• Diagram the data flow (visual or text-based).
• Explain why we separate frontend and backend.

Chapter 2: Key Libraries & "Why?"

• For every major dependency (React, better-sqlite3, Tailwind, etc.), explain:
  • What it does.
  • Crucially: Why was it chosen? What problem does it solve that vanilla JS couldn't?

Chapter 3: Critical Algorithms & Logic

• The Taxonomy System: deeply explain the "Tag Sieve" and normalization logic.
• Search Algorithms: How does the search bar find books? (SQL LIKE, indexing, etc.)
• Pagination vs. Virtualization: How do we handle lists of 10,000 items?

Chapter 4: Database Design

• Explain the Schema (Books, Tags, Metadata).
• Explain WAL Mode and Transactions (Concept: A.C.I.D. properties).

Chapter 5: Advanced Patterns Used

• Identified patterns (e.g., Singleton in DB, Observer in SSE).
• State Management (Push vs Pull).

Final Output

Write the file to [ProjectRoot]/docs/education/PROGRAMMING_CONCEPTS.md.