✅ add prettier formatting check to CI workflow and npm scripts

- Add prettier job to GitHub Actions workflow to enforce code formatting
- Add format:check script to package.json for checking formatting
- Include failure message when prettier check fails in CI

.github/workflows/test.yml

@@ -51,3 +51,21 @@ jobs:
       run: npm run build
     - name: Run E2E Tests
       run: npm run test:e2e
+  prettier:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Use Node.js
+      uses: actions/setup-node@v4
+      with:
+        node-version: '20.x'
+        cache: 'npm'
+    - name: Install dependencies
+      run: npm ci
+    - name: Run Prettier
+      run: npm run format:check
+    - name: Prettier Output
+      if: failure()
+      run: |
+        echo "Prettier check failed. Please run 'npm run format' to fix formatting issues."
+        exit 1