Convert the Lupine theme to the semantic color system introduced in the
quattro/Omarchy 4 line:
- Rewrite colors.toml from the old accent/foreground/background/color0-15
scheme to the semantic palette (mode, bg/fg ramp, named ANSI hues, and
bright_* variants). The chromatic palette is preserved exactly; only the
keys are renamed.
- Replace the empty light.mode marker with mode = "light".
- Drop the hand-shipped btop.theme and chromium.theme; both are now
generated from default/themed/*.tpl at theme-set time.
Selection now follows the convention used by the other light themes
(selection_foreground = bright_fg over a light selection background)
instead of the previous inverted dark selection bar.
