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Implements accessible 'About this market' educational modal detailing resolution criteria and oracle parameters for the GrantFox FWC26 campaign.
## What Changed
- Created new Client Component `AboutMarketModal` detailing the prediction market's question, oracle source, target resolution date, and Yes/No outcome criteria.
- Updated `MarketHero` to support rendering this modal trigger in its Actions row.
- Updated the market page Server Component to pass the modal into the hero component.
- Fixed a compilation error in `components/ui/dialog.tsx` where `useRef` was referenced without prefixing `React.`.
- Registered `AboutMarketModal` in the internal accessibility board (`app/a11y-audit/page.tsx`), the documentation board (`docs/a11y-status.md`), and the accessibility manifest (`app/data/a11y-manifest.json`).
## Accessibility
- Screen reader announcements: Uses explicit labels (`aria-labelledby`/`aria-describedby`) and comprehensive hidden `sr-only` descriptions for screen readers.
- Keyboard trapping and return: Implements `DialogContentWithFocusReturn` to ensure focus is restored to the trigger button when the modal closes.
- Color contrast: Meets WCAG 2.1 AA text contrast requirements in both light and dark modes.