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Add comprehensive suffix reference (diminutives, augmentatives, verb endings, noun/adjective-forming, adverbs, pejoratives) as grammar note #21 under Word Building category. Refactor grammar detail rendering to group paragraphs with their examples into visual cards, replacing the flat wall-of-text layout. Suffix entries get pill-styled labels with compact inline examples. Bump courseDataVersion to 5. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>