Set image above background color

[DanteDragan]

Is your feature request related to a problem? Please describe.
When setting a wallpaper with Azote on swaybg, you could set bg color or image only.
When an image is not 16:9 and it's set with mode "fit" all the remaining space is blank and filled with standard Hyprland bg.

But if using swaybg in terminal

swaybg -c #000000 -i /ARCHIVE/Images/WALLPAPERS/Necromancer/wallhaven-xldxwz.jpg -m fit

you're getting proper result.

Describe the solution you'd like
Way to set bg color for images in fit mode

Describe alternatives you've considered
Waypaper has implemented such thing, but it missing context menu, convenient monitor preview and so on. So, I'd switch to Azote.

Additional context
Add any other context or screenshots about the feature request here.