A light or muddy-toned wallpaper (e.g. an all-beige photo) makes pywal hand
back a light or off-hue background/surface slot, and every bread GUI's
panels inherited it directly — the app stopped looking like a dark BOS tool
and started looking like whatever colour the wallpaper happened to be.
background/foreground/color0(surface)/color7(overlay) are now fixed BOS
dark-theme constants, never read from pywal's special/colors blocks. Only
color1-6 (the actual accent slots) still track the wallpaper via pywal, which
is the feature breadpaper is for.
