Add BUI CSS to createDevApp

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/frontend-dev-utils/package.json

@@ -38,7 +38,8 @@
   "dependencies": {
     "@backstage/frontend-defaults": "workspace:^",
     "@backstage/frontend-plugin-api": "workspace:^",
-    "@backstage/plugin-app": "workspace:^"
+    "@backstage/plugin-app": "workspace:^",
+    "@backstage/ui": "workspace:^"
   },
   "devDependencies": {
     "@backstage/cli": "workspace:^",

packages/frontend-dev-utils/src/createDevApp.tsx

@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+// eslint-disable-next-line @backstage/no-ui-css-imports-in-non-frontend
+import '@backstage/ui/css/styles.css';
+
 import {
   FrontendFeature,
   FrontendFeatureLoader,