Mica Transparent Background

[vanja-san]

Discussed in #225

^{Originally posted by vanja-san April 6, 2024}
! Hasty sketches!

Is it possible to implement function to set a picture with transparent background on top of Mica theme?
And add a picture alignment function. Alignments BG: left, right, top, bottom borders

Preview example (Imagine as if Mica theme was installed!):

Example picture (transparent png / 434x480):

Example Settings: