Plan: Book-themed UI -> Cover/Spread 1 (Analytics) -> Page 2-6 (Glossary Chunks) -> Navigation State Management.
Choices: Page Spread layout (Desktop) / Stacked (Mobile). Chart.js (Bar) and Plotly (ScatterGL) integrated on initial spread. No SVG/Mermaid.
Grade 8: Unit 1 Educational Tour
Interactive Vocabulary Learning Book
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