Same treatment as the branch's `as_chunks` commit (Rust 1.99's
`chunks_exact_to_as_chunks` lint) for the flattener's coverage pass, the
CMYK ink compositor, the Flattener Preview highlight and four test helpers.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
effect.expandAppearance now expands the whole appearance: each visible fill becomes a
path of its own and each stroke its outline (a brushed stroke its brush art), grouped
in paint order under the object's id and transparency; geometry effects are baked and
raster effects become an embedded image (shadows below the art, blur/feather/inner glow
replacing it). Type with effects or its own fills is outlined, and a group's or layer's
own fills and strokes are expanded among its members. The command is enabled whenever
an appearance isn't basic. Builds on bake_leaf (effects::expand_leaf / expand_art) and
shares the raster-effect image code with PDF export.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
