ci: move style job into ci.yml and remove separate formatting workflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: obadaDeg

.github/workflows/check-formatting.yml

@@ -22,4 +22,23 @@ jobs:
         run: npm ci
 
       - name: Run tests
-        run: npm run test -- --coverage
+        run: npm run test -- --coverage
+
+  style:
+    name: Style
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Check formatting
+        run: npm run format:check