forked from 1b-agent/opencadstudio-upstream
LAYISO — turn off all layers except selected entities' layers
LAYUNISO — restore all layers (turn-on all, mirrors LAYON)
FLATTEN — move selected (or all) entities to Z=0; handles Line/Circle/Arc/
LwPolyline/Text/MText/Insert/Point/Spline/Ellipse
QSELECT — select entities by TYPE, LAYER, COLOR, or LINETYPE
Co-Authored-By: Claude Sonnet 4.6 <[email protected]>