fix: WCAG AA accessibility pass — landmarks, nav, alt text, headings, accordion#625

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thostetler wants to merge 23 commits intomasterfrom

Commits on Mar 4, 2026

Commits on Mar 5, 2026

fix: address review comments from PR #622
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fix: add lang="en", iframe titles, and post-title guard (sia-r4, sia-r13, sia-r64)
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fix: trim iframe title and guard h1.post-title in blog_page_scix (sia-r13, sia-r64)
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fix: refactor left-nav list markup to valid li>a nesting (sia-r68)
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fix: propagate active link color and add focus-visible outline (sia-r68)
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fix: wrap page content in landmark regions (sia-r57)
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fix: use semantic accordion pattern for help nav (sia-r90)
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fix: address accordion review findings (sia-r90 follow-up)
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fix: add missing alt text to images (sia-r2)
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fix: add unique aria-label to all nav landmarks (sia-r56)
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fix: correct heading level hierarchy to remove skips (sia-r53)
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fix: promote two inline-conditional h5 Q: headings to h3 in faqs.md (sia-r53)
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fix: remove orphaned aria-multiselectable from left-nav accordion (sia-r90)
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fix: address review comments from PR #625
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fix: merge upstream master, resolve libraries index conflicts
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fix: reserve space for Google search and remove slide-in animation
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Revert "fix: reserve space for Google search and remove slide-in animation"
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