forked from 1b-agent/opencadstudio-upstream
Scene now carries bg_color / paper_bg_color fields (defaults match previous hard-coded values). synced_hatch_models() reads these instead of hard-coded constants, so Wipeout fills correctly use the custom background when BACKGROUND <r> <g> <b> has been set. BACKGROUND command syncs both DocumentTab.bg_color and scene.bg_color. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>