Helium now takes its colors from Breeze GTK instead of a generated
theme extension, which reset the GTK theme on every launch.
- Import window_decorations.css from gtk.css so Helium, which doesn't
load kde-gtk-config's GTK module, draws the KWin title buttons
instead of Breeze GTK's round ones.
- Add chromium.css to give the compact layout's address bar and
button segment the title bar color, so the tab strip is one color.
- Disable WaylandWpColorManagerV1 so KWin doesn't lift Helium's dark
grays (40 -> 44) and the strip matches KDE title bars.
- Drop the Helium theme from build.py and the helium package.
Split the packages by platform so each app stays an opt-in Stow package
under common/, mac/ or kde/. KDE gets its own Fastfetch, Helium and
Spectacle packages, and darwin-breeze becomes kde/theme. The READMEs
document stowing a whole group as well as individual packages.
tri