SmartArt and OLE objects now keep their parts as media items
(ShapeKind::Opaque::parts). media_refs visits them, so slide.reuse copies them
and picture.compress never deletes them; the Opaque arm names every field so a
new one can't be missed.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
slide.reuse indexed src.slides[i] and found media by scanning JSON keys
(media/poster/preview/sound), which missed artistic-effect originals and would
miss any reference stored under another key. New engine module media_refs: one
typed walker over the model (written once, expanded for & and &mut) that visits
every MediaId a presentation, master, layout, slide or shape can hold: pictures
and their artistic originals, picture fills in shapes, lines, runs, table cells
and styles, chart series and points, backgrounds and theme format schemes;
media clips and posters, 3-D models, OLE/SmartArt previews and node pictures,
picture bullets, hyperlink, transition and animation sounds, embedded fonts.
slide.reuse now lists and remaps media through it, uses get() for slides, and
keeps a linked media item's link when copying it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Brandon Thomas