forked from 1b-agent/opencadstudio-upstream
COPYCLIP/CUTCLIP used the mean of each entity's bounding-box centre as the paste anchor. Standard clipboard behaviour puts the lower-left corner of the box enclosing all copied items under the cursor. Union each entity's bbox min corner instead, and rename clipboard_centroid -> clipboard_base (COPYBASE also stores a picked point there, so "centroid" was inaccurate). Co-Authored-By: Claude Opus 4.8 <[email protected]>