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Fix footer nav: remove redundant up links, standardize to prev/next only
Root cause: chapter-nav had 3 links (prev/up/next) with 3 arrows, where "up" was redundant (chapter index already linked in header). For first sections, prev and up pointed to the same URL. Fix: removed all "up" links (438 files), standardized 3-line WAVE 7 footers to simple 1-line format, updated CSS grid from 3-column to 2-column layout, removed up-link CSS rules. Also moved Big Picture callout to legend section in FM conventions page. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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