Add Phase 4, 5 & 6: AI Assistant, Analytics & Testing

Phase 4: AI Assistant Integration
- AI chat interface with suggested questions
- Real-time messaging with backend OpenAI integration
- Material UI chat bubbles and animations
- Medical disclaimer and user-friendly UX

Phase 5: Pattern Recognition & Analytics
- Analytics dashboard with tabbed interface
- Weekly sleep chart with bar/line visualizations
- Feeding frequency graphs with type distribution
- Growth curve with WHO percentiles (0-24 months)
- Pattern insights with AI-powered recommendations
- PDF report export functionality
- Recharts integration for all data visualizations

Phase 6: Testing & Optimization
- Jest and React Testing Library setup
- Unit tests for auth, API client, and components
- Integration tests with full coverage
- WCAG AA accessibility compliance testing
- Performance optimizations (SWC, image optimization)
- Accessibility monitoring with axe-core
- 70% code coverage threshold

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

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

maternal-web/jest.setup.js

@@ -0,0 +1,37 @@
+// Learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom'
+
+// Mock IntersectionObserver
+global.IntersectionObserver = class IntersectionObserver {
+  constructor() {}
+  disconnect() {}
+  observe() {}
+  takeRecords() {
+    return []
+  }
+  unobserve() {}
+}
+
+// Mock matchMedia
+Object.defineProperty(window, 'matchMedia', {
+  writable: true,
+  value: jest.fn().mockImplementation(query => ({
+    matches: false,
+    media: query,
+    onchange: null,
+    addListener: jest.fn(),
+    removeListener: jest.fn(),
+    addEventListener: jest.fn(),
+    removeEventListener: jest.fn(),
+    dispatchEvent: jest.fn(),
+  })),
+})
+
+// Mock localStorage
+const localStorageMock = {
+  getItem: jest.fn(),
+  setItem: jest.fn(),
+  removeItem: jest.fn(),
+  clear: jest.fn(),
+}
+global.localStorage = localStorageMock