forked from 1b-agent/opencadstudio-upstream
Builds on the background-persistence change: let BACKGROUND take a single
named-colour token in addition to `<r> <g> <b>`, so a common dark/light
background is one word instead of a remembered triplet:
BACKGROUND WHITE | BLACK | GRAY|GREY | DARKGRAY|DARKGREY | LTGRAY
Colour parsing moves into `parse_background_color`; the persisted-default
and recolor paths are unchanged.
Co-Authored-By: Claude Opus 4.8 <[email protected]>