* feat(web): add homepage and category pages (Phase 4 M4) Implement the first real forum pages with full component library: - API client with TypeScript types matching barazo-api schemas - MSW mock handlers for testing (Tier 3 hand-written) - ForumLayout with header, sidebar, footer, skip links - Pagination component (WCAG 2.2 AA, aria-current) - Breadcrumbs with JSON-LD BreadcrumbList structured data - TopicCard/TopicList components with reply/reaction counts - CategoryNav with hierarchical tree display - Homepage (/) with recent topics, category sidebar, JSON-LD WebSite - Category page (/c/[slug]) with filtered topics, breadcrumbs - FocusOnNavigate hook for client-side route transitions - Switch from static export to standalone SSR output - 62 tests passing across 10 test files with axe a11y checks * fix(ci): update accessibility audit for standalone output - Add try-catch error handling to homepage for API unavailability - Update CI workflow to use standalone server instead of static serve - Fix build artifact paths for standalone output - Use polling wait instead of fixed sleep for server readiness * fix(a11y): add underline to footer link for link-in-text-block rule Links within text blocks must be visually distinguished from surrounding text using more than just color (WCAG 2.2 AA).