The desktop DMG's volume icon defaulted to the packager's icns, which is
actool's 256px fallback whenever mac.icon is the Icon Composer package, and
dmgbuild's badge option can only paste onto the stock removable-drive icon.
Ship our own drive-with-the-girl artwork instead: assets/dmg-volume.png
(hand-made, one artwork since volume icons have no appearance variants) is
emitted as apps/desktop/packaging/dmg-volume.icns, beside the DMG background
so the `files` whitelist keeps it out of the app bundle, and dmg.icon points
at it.
Tauri always uses the app icns as the volume icon and offers no override, so
the bootstrap workflow runs scripts/bundles/set_dmg_volume_icon.sh on the
built DMG before signing (the same .VolumeIcon.icns + custom-icon flag
dmgbuild sets), and the verify step checks the icon is on the mounted image.
Verified on macOS 26.6.2: both DMGs render the identical volume icon.
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