Add Node.js server build to CI workflow

- Add dedicated job for building Node.js server
- Use Node 20 on Ubuntu for the server build
- Run npm ci, build, and tests for the web directory
- Upload dist/ folder as build artifacts

.github/workflows/ci.yml

@@ -11,8 +11,41 @@ env:
   DEVELOPER_DIR: /Applications/Xcode.app/Contents/Developer
 
 jobs:
+  build-node-server:
+    name: Build Node Server
+    runs-on: ubuntu-latest
+    
+    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: web/package-lock.json
+        
+    - name: Install dependencies
+      working-directory: web
+      run: npm ci
+      
+    - name: Build server
+      working-directory: web
+      run: npm run build
+      
+    - name: Run tests
+      working-directory: web
+      run: npm test
+      
+    - name: Upload build artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: node-server-build
+        path: web/dist/
+
   build-and-test:
-    name: Build and Test
+    name: Build and Test macOS App
     runs-on: macos-15
     
     steps: