doc: improve documentation accessibility

[franky47]

Summary

• add accessible names, labels, state, and native keyboard behavior to documentation controls
• add skip links and repair generated table-of-contents fragment targets
• improve release graph, framework icon, landmark, focus, and contrast semantics
• add focused regression coverage for the updated controls and document processing

Verification

• all 106 documentation tests pass
• the production documentation build passes
• local Pa11y checks cover all documentation routes
• browser checks cover skip links, controls, rating radios, sliders, and fragment targets
• Fable review and Plannotator approval completed

[vercel]

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Project	Deployment	Actions	Updated (UTC)
nuqs	Ready	Preview	Aug 9, 2026 9:49pm

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