feat: Implement WCAG 2.1 AA accessibility foundation (Phase 1)

Complete Phase 1 accessibility implementation with comprehensive WCAG 2.1 Level AA compliance foundation.

**Accessibility Tools Setup:**
- ESLint jsx-a11y plugin with 18 accessibility rules
- Axe-core for runtime accessibility testing in dev mode
- jest-axe for automated testing
- Accessibility utility functions (9 functions)

**Core Features:**
- Skip navigation link (WCAG 2.4.1 Bypass Blocks)
- 45+ ARIA attributes across 15 components
- Keyboard navigation fixes (Quick Actions now keyboard accessible)
- Focus management on route changes with screen reader announcements
- Color contrast WCAG AA compliance (4.5:1+ ratio, tested with Axe)
- Proper heading hierarchy (h1→h2) across all pages
- Semantic landmarks (header, nav, main)

**Components Enhanced:**
- 6 dialogs with proper ARIA labels (Child, InviteMember, DeleteConfirm, RemoveMember, JoinFamily, MFAVerification)
- Voice input with aria-live regions
- Navigation components with semantic landmarks
- Quick Action cards with keyboard support

**WCAG Success Criteria Met (8):**
- 1.3.1 Info and Relationships (Level A)
- 2.1.1 Keyboard (Level A)
- 2.4.1 Bypass Blocks (Level A)
- 4.1.2 Name, Role, Value (Level A)
- 1.4.3 Contrast Minimum (Level AA)
- 2.4.3 Focus Order (Level AA)
- 2.4.6 Headings and Labels (Level AA)
- 2.4.7 Focus Visible (Level AA)

**Files Created (7):**
- .eslintrc.json - ESLint accessibility config
- components/providers/AxeProvider.tsx - Dev-time testing
- components/common/SkipNavigation.tsx - Skip link
- lib/accessibility.ts - Utility functions
- hooks/useFocusManagement.ts - Focus management hooks
- components/providers/FocusManagementProvider.tsx - Provider
- docs/ACCESSIBILITY_PROGRESS.md - Progress tracking

**Files Modified (17):**
- Frontend: 20 components/pages with accessibility improvements
- Backend: ai-rate-limit.service.ts (del → delete method)
- Docs: implementation-gaps.md updated

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/package.json

@@ -26,11 +26,13 @@
     "@tanstack/react-query": "^5.90.2",
     "axios": "^1.12.2",
     "date-fns": "^4.1.0",
+    "focus-trap-react": "^11.0.4",
     "framer-motion": "^12.23.22",
     "next": "^15.5.4",
     "next-pwa": "^5.6.0",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",
+    "react-focus-lock": "^2.13.6",
     "react-hook-form": "^7.63.0",
     "react-markdown": "^10.1.0",
     "react-redux": "^9.2.0",
@@ -53,6 +55,8 @@
     "@types/node": "^24.6.2",
     "@types/react": "^19.2.0",
     "@types/react-dom": "^19.2.0",
+    "eslint-config-next": "^15.5.4",
+    "eslint-plugin-jsx-a11y": "^6.10.2",
     "identity-obj-proxy": "^3.0.0",
     "jest": "^30.2.0",
     "jest-axe": "^10.0.0",