P0 fixes:
- Image result cards are now real <a> links (open-in-new-tab, Cmd-click, copy-link)
- aria-label on all icon-only buttons (settings, clear, close, nav, toggles, delete)
- Search input semantics: label, name=q, type=search, combobox ARIA pattern
- Visible focus-visible ring on all interactive elements, removed bare outline-none
P1 fixes:
- Skip to main content link for keyboard navigation
- Proper heading hierarchy (h1/h2) and landmark elements (nav, main, aside)
- aria-live regions for loading/results/error announcements
- Custom favicon SVG (eliminates 404 console errors)
- Dialog/modal semantics with role=dialog and aria-modal
P2 API improvements:
- result_id, rank, engine on every result; timestamp, total_results, has_next on response
- Standardized APIError model (code/message/details/retry_hint) on all error responses
- X-Response-Time-Ms and rate-limit headers on all responses
- curl examples and sample JSON in OpenAPI docs for every endpoint
- Global exception handler returns consistent error JSON
- engines parameter in URL for reproducible sessions
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
junvandCopilot