[UI] Library fix (#11530)

* Ensure "lib" is built as part of CI

* Fix useMonitorBackgroundTask hook

.github/workflows/qc_checks.yaml

@@ -759,7 +759,7 @@ jobs:
       - name: Install dependencies
         run: cd src/frontend && yarn install
       - name: Build frontend
-        run: cd src/frontend && yarn run compile && yarn run build
+        run: cd src/frontend && yarn run compile && yarn run lib && yarn run build
       - name: Write version file - SHA
         run: cd src/backend/InvenTree/web/static/web/.vite && echo "$GITHUB_SHA" > sha.txt
       - name: Zip frontend