PLAYER screen: slightly different BG color for List than Player

[Robio]

Checklist

• [X] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [X] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [X] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [X] I have taken the time to fill in all the required details. I understand that the bug report will be dismissed otherwise.
• [X] This issue contains only one feature request.
• [X] I have read and understood the contribution guidelines.
• [X] I optionally donated to support the Fossify mission.

Feature description

Make the playlist part of the Player screen the same BG color as the spectrogram on the Recorder screen.``

Why do you want this feature?

In the Player screen, there's no visual indication of where the list stops and the player controls begin. The is exacerbated by the scroll indicator only showing when you're actually scrolling.

If the List was the same color as the spectrogram background, the UI would be more visually consistent and more user-friendly.

Additional information

No response