Tauri's bundler (cli 2.11.4) compiles an Icon Composer package listed in
bundle.icon into Assets.car with actool >= 26 and sets CFBundleIconName, so
the bootstrap installer gets an unbranded twin of the desktop package under
src-tauri/icons/icon.icon (generator target; the bundle stays the plain
brand because flavours only apply under apps/desktop/). Tauri only logs when
actool is too old, so the macOS job selects Xcode 26 and the verify step
asserts Assets.car and the plist key are in the built .app.
The desktop DMG's volume icon defaulted to the packager's icns, which is
actool's 256px fallback whenever mac.icon is the .icon package; point
dmg.icon at the full-resolution assets/icon.icns. Tauri's DMG already takes
--volicon from the bundle's .icns, which the regenerated outputs cover.
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