Audit and fix HTML accessibility issues across ARIA labels, keyboard navigation, focus management, and WCAG compliance.

• Covers nine rule categories prioritized by impact: accessible names, keyboard access, focus management, semantics, forms and errors, announcements, contrast, media, and tool boundaries
• Provides targeted fixes for common patterns like icon-only buttons, form error linking, and focus trapping in modals
• Includes quick reference for when to apply (interactive controls, forms, dialogs, custom interactions) and common code-level fixes with before/after examples
• Emphasizes minimal, surgical changes over large UI rewrites and prefers native HTML elements over ARIA workarounds