The palette PNG encoder never wrote a pHYs chunk, so an Indexed Color
document saved as PNG reopened at 72 ppi while the RGB path kept its
resolution. encode_png_indexed now takes an optional dpi and the flat
exporter passes the document resolution under the same embed_metadata
rule as the ordinary PNG encoder. Save for Web PNG-8 is unchanged.
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
CI's `cargo fmt --all -- --check` has failed on every run because the
repo had no rustfmt config and was never formatted. Use the same settings
as EffectCraft/FilmCraft (max_width 160, use_small_heuristics Max), which
also keeps the churn small. Formatting only; no code changes.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>