PASTECLIP recreated missing block definitions, tessellated pasted solids,
and refreshed the layer panel after a paste; PASTEORIG and PASTEBLOCK did
not. A block pasted through either of those rendered empty because its
definition was never recreated in the target drawing.
Both paths now call merge_clipboard_blocks (so referenced/nested block
definitions exist) and populate_meshes_from_document (so pasted ACIS
solids tessellate); PASTEORIG also refreshes the layer panel.
Co-Authored-By: Claude Opus 4.8 <[email protected]>