LaTeX `animate` PDFs store each frame as a read-only push button and drive
them from a Screen annotation. PdfCraft showed "This document contains N
interactive form fields." because the bar counted any field, and listed
the Screen annotation in the Comments panel because only Link, Widget and
Popup were filtered out.
- The form-fields bar now needs at least one field that isn't a push
button (something to fill in).
- Non-markup annotations (ISO 32000-2 §12.5.6: Screen, Movie, RichMedia,
3D, PrinterMark, TrapNet, Watermark) are no longer comments, both when
a document is inspected and when the comment list is rebuilt after an
edit (new pdfcraft_annot::is_comment_subtype).
Playing the animation itself (page actions, timers) is out of scope here.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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