[ci] run stylelint as part of CI tests (#6143)

## Summary

Final PR continuing from

- https://github.com/Comfy-Org/ComfyUI_frontend/pull/5926
- https://github.com/Comfy-Org/ComfyUI_frontend/pull/5940

actually run stylelint in lint workflows.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6143-ci-run-stylelint-as-part-of-CI-and-pre-commit-hook-2916d73d3650811891bcc9f94379cc5f)
by [Unito](https://www.unito.io)

---------

Co-authored-by: DrJKL <DrJKL@users.noreply.github.com>

src/renderer/extensions/vueNodes/widgets/components/audio/AudioPreviewPlayer.vue

@@ -388,7 +388,7 @@ onUnmounted(() => {
 
 <style scoped>
 .audio-player-menu {
-  --p-tieredmenu-item-focus-background: rgba(255, 255, 255, 0.1);
-  --p-tieredmenu-item-active-background: rgba(255, 255, 255, 0.1);
+  --p-tieredmenu-item-focus-background: rgb(255 255 255 / 0.1);
+  --p-tieredmenu-item-active-background: rgb(255 255 255 / 0.1);
 }
 </style>