Implement Phase 8: Testing & Deployment

Testing Infrastructure:
- Configure Jest with Next.js integration and TypeScript support
- Add React Testing Library with proper setup for Next.js components
- Install and configure Playwright for E2E testing
- Create jest.setup.ts with mocks for Next.js router and browser APIs
- Add CSS module mocking with identity-obj-proxy

Unit Tests:
- Create LoadingFallback component tests covering all 5 variants
- Create tracking API tests for data transformation logic
- Test createActivity, getActivities data structure conversions
- Verify frontend (timestamp/data) to backend (startedAt/metadata) mapping

E2E Tests (Playwright):
- Create comprehensive tracking flow tests
- Test navigation to all tracker pages (feeding, sleep, diaper)
- Test homepage Today's Summary display
- Test AI Assistant and Analytics navigation
- Test feeding, sleep, and diaper tracker UI elements
- Configure multi-browser testing (Chrome, Firefox, Safari, Mobile)

CI/CD Pipeline (GitHub Actions):
- Create automated CI/CD workflow for master/main branches
- Run linting on every push and PR
- Execute unit tests with coverage reporting
- Run E2E tests (Chromium) in CI environment
- Build application and upload artifacts
- Upload test coverage to Codecov
- Upload Playwright test reports as artifacts

Test Scripts:
- npm test: Run Jest unit tests
- npm run test⌚ Run tests in watch mode
- npm run test:coverage: Generate coverage report
- npm run test:e2e: Run Playwright E2E tests
- npm run test:e2e:ui: Run E2E tests with UI mode
- npm run test:e2e:headed: Run E2E tests in headed mode

Documentation:
- Create comprehensive testing guide (tests/README.md)
- Document test structure and best practices
- Add troubleshooting section for common issues
- Include useful commands for debugging tests

Coverage Thresholds:
- Branches: 70%
- Functions: 70%
- Lines: 70%
- Statements: 70%

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

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

maternal-web/components/common/__tests__/LoadingFallback.test.tsx

@@ -0,0 +1,34 @@
+import { render } from '@testing-library/react'
+import { LoadingFallback } from '../LoadingFallback'
+
+describe('LoadingFallback', () => {
+  it('renders without crashing for page variant', () => {
+    const { container } = render(<LoadingFallback variant="page" />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+
+  it('renders without crashing for card variant', () => {
+    const { container } = render(<LoadingFallback variant="card" />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+
+  it('renders without crashing for list variant', () => {
+    const { container } = render(<LoadingFallback variant="list" />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+
+  it('renders without crashing for chart variant', () => {
+    const { container } = render(<LoadingFallback variant="chart" />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+
+  it('renders without crashing for chat variant', () => {
+    const { container } = render(<LoadingFallback variant="chat" />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+
+  it('defaults to page variant when no variant is specified', () => {
+    const { container } = render(<LoadingFallback />)
+    expect(container.firstChild).toBeInTheDocument()
+  })
+})