[FR] currently playing indicator for playlists

[owosoup]

Is your feature request related to a problem? Please describe.
A clear and concise description of what the problem is. Ex. I'm always frustrated when I have to check the song queue to find out which playlist I'm listening to.

Describe the solution you'd like
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I'd like for playlists to have the same indicator as individual songs have, plus that seems easy since it's already done for those.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Instead of adding a motif, you could always render the font more intensely, or underline it, or put it in italics.

• I will follow the issue format and will add [FR] to the start of my issue title, and I acknowledge that if I don't follow the format, my issue might get closed without further explanation.