[Feature Request]: Different Background Choices for when Artist Artwork is Unavailable

[PasttaTypo]

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📝 Provide a description of the new feature

Having the background choice as artist artwork w/out blur is my setup and i love it, but whenever an artist doesn't have a custom background image, it defaults to album artwork, which is always slightly low-res and stretched out in full screen.
It would be nice to have the option to save a custom background image as a backup instead, similar to #142, even if only a single background image for simplicity.
Also, there could be different options for backup background choices when artist art is unavailable in settings: to use solid color, to blur the album art, or to not change the background image until the song playing has respective artist art.

➕ Additional Information

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