feat(ci): split staging workflow into parallel test and deploy jobs

.github/workflows/staging.yml

@@ -10,10 +10,9 @@ permissions:
   packages: write
 
 jobs:
-  build-and-deploy:
-    name: Build & Deploy to Staging
+  test:
+    name: Test
     runs-on: ubuntu-latest
-    environment: staging
 
     steps:
       - name: Checkout
@@ -38,6 +37,25 @@ jobs:
       - name: Run tests
         run: npm run test:run
 
+  deploy:
+    name: Build & Deploy to Staging
+    runs-on: ubuntu-latest
+    needs: test
+    environment: staging
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: "24"
+          cache: "npm"
+
+      - name: Install dependencies
+        run: npm ci
+
       - name: Build
         run: npm run build