SolidCraft.icon/ is the approved Icon Composer source, containing separate background, grid and solid SVG layers and the owner's appearance settings. The white edges are clipped to the solid silhouette. Artwork is original and attributed in ATTRIBUTION.md.

Assets.car is compiled by Apple's actool and supplies the layered icon on macOS 26 and later. It is checked in so the existing release workflow can still package on older Xcode runners. After editing and saving SolidCraft.icon, regenerate the catalog with Xcode 26 or later from the repository root:

mkdir -p target/macos-icon
xcrun actool assets/SolidCraft.icon \
  --compile target/macos-icon --platform macosx \
  --minimum-deployment-target 11.0 --app-icon SolidCraft \
  --output-partial-info-plist target/macos-icon/icon-info.plist \
  --output-format human-readable-text
cp target/macos-icon/Assets.car assets/Assets.car

icon.vectorcraft and icon.svg preserve the traditional artwork before Icon Composer's system material effects. icon.png is its transparent 1024 px VectorCraft export with native rounded corners and optical padding. The icon.iconset/ variants and icon.icns provide the older-macOS fallback. After re-exporting the traditional PNG, regenerate them with Apple's tools:

for s in 16 32 128 256 512; do
  sips -z "$s" "$s" assets/icon.png \
    --out "assets/icon.iconset/icon_${s}x${s}.png" >/dev/null
  sips -z "$((s * 2))" "$((s * 2))" assets/icon.png \
    --out "assets/icon.iconset/icon_${s}x${s}@2x.png" >/dev/null
done
iconutil -c icns -o assets/icon.icns assets/icon.iconset

Only packaging/macos/package.sh consumes these resources. Its existing signed app/DMG workflow copies the catalog and ICNS into Contents/Resources, and Info.plist references SolidCraft through CFBundleIconName and CFBundleIconFile. The macOS viewport opts out of eframe's runtime bitmap so Finder, the Dock and the application switcher use the bundle icon. Other platforms retain the existing code-drawn icon and packaging.

Design references: Apple app-icon HIG and Icon Composer documentation. No Apple artwork is shipped.