PURGE now repeats until a pass removes nothing, so definitions freed by
a purged block (nested blocks, layers, linetypes, styles) go in one run.
Reference scan keeps layer linetypes, ATTDEF/ATTRIB text styles, and
dimstyle DIMTXSTY + arrow blocks; the undo snapshot moves before the
first removal so one UNDO restores everything. Bare PURGE prompts with
clickable category options (aliases B/LA/LT/ST run directly), and
pinned prompts drop their "[A / B / …]" listing when the same options
render as buttons.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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