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>

.github/workflows/ci.yml

@@ -0,0 +1,115 @@
+name: CI/CD Pipeline
+
+on:
+  push:
+    branches: [master, main]
+  pull_request:
+    branches: [master, main]
+
+jobs:
+  lint-and-test:
+    name: Lint and Test
+    runs-on: ubuntu-latest
+    
+    defaults:
+      run:
+        working-directory: maternal-web
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: maternal-web/package-lock.json
+      
+      - name: Install dependencies
+        run: npm ci
+      
+      - name: Run linter
+        run: npm run lint
+      
+      - name: Run unit tests
+        run: npm run test -- --ci --coverage
+      
+      - name: Upload coverage reports
+        uses: codecov/codecov-action@v4
+        with:
+          directory: maternal-web/coverage
+          flags: frontend
+          fail_ci_if_error: false
+
+  e2e-tests:
+    name: E2E Tests
+    runs-on: ubuntu-latest
+    needs: lint-and-test
+    
+    defaults:
+      run:
+        working-directory: maternal-web
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: maternal-web/package-lock.json
+      
+      - name: Install dependencies
+        run: npm ci
+      
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium
+      
+      - name: Run E2E tests
+        run: npm run test:e2e -- --project=chromium
+        env:
+          CI: true
+      
+      - name: Upload Playwright report
+        uses: actions/upload-artifact@v4
+        if: always()
+        with:
+          name: playwright-report
+          path: maternal-web/playwright-report/
+          retention-days: 30
+
+  build:
+    name: Build Application
+    runs-on: ubuntu-latest
+    needs: lint-and-test
+    
+    defaults:
+      run:
+        working-directory: maternal-web
+    
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: '20'
+          cache: 'npm'
+          cache-dependency-path: maternal-web/package-lock.json
+      
+      - name: Install dependencies
+        run: npm ci
+      
+      - name: Build application
+        run: npm run build
+      
+      - name: Upload build artifacts
+        uses: actions/upload-artifact@v4
+        with:
+          name: build
+          path: maternal-web/.next/
+          retention-days: 7