Add shadow support for media widget progress bar

[iwdath]

What is the request?

The recently added progress_bar can visually blend into the thumbnail background. Adding a shadow to the progress bar would help improve its visibility.

Why is it useful?

A shadow similar to label_shadow or container_shadow, but applied to the progress bar, would make it more readable on bright or detailed covers. It could also make sense if label_shadow optionally applied its shadow to the progress bar as well, so the visual style stays consistent without adding extra configuration.

How could it be implemented?

No response

Additional context

No response

[yasb-support]

Thanks for the feature request and for using YASB!

YASB is a free, community-driven project and we spend a lot of time building and maintaining it.
Our development focus is primarily guided by supporters (GitHub Sponsors/Ko-fi) and by requests that show clear community interest.

To keep feature work sustainable, feature requests should receive upvotes from other users before we take them on.
If your request is a clear quality improvement that can help many users, we may still consider it even without high upvotes.

If you’d like to help prioritize this request, please consider supporting the project and encourage others to upvote it.

Thanks for understanding and for helping YASB grow!

YASB Support Bot