The near-black #120C12 behind the icon reads as black on dark home
screens, and the same fill backs the store icon, feature graphic and
README logo. Raise it to a plum #2D1C2D (L* 4.6 -> 13.1) so the
background is visible without costing the #F862F8 foreground its
contrast. The amber nightly background moves from #1A1200 to #2E2000 by
the same lightness step, so it stays amber instead of drifting to
brown-black.
Raster assets were recoloured from the committed originals; the vector
sources in images/ have no background and are unchanged.
Set the nightly launcher background to a dark tint of the amber mark
(#1A1200) instead of the magenta-tinted near-black, mirroring how the
standard icon's background is a dark tint of its magenta fill.
The 17-character 'subtracks nightly' label just truncates in the launcher,
so revert the app_name override (debug and nightly show 'subtracks' like
the release) and distinguish the nightly with a recoloured launcher icon
(amber mark) instead. The debug and nightly variants share src/nightly/res,
so installDebug and installNightly look the same.
austinried
