desktop-v0.3.0

App Preview — macOS desktop build (auto-released from main).
Signed with Developer ID & notarized by Apple — opens with no Gatekeeper warning.
Auto-update enabled (File ▸ Check for Updates…).

(If the Apple signing secrets are unset, the build falls back to unsigned;
then run xattr -dr com.apple.quarantine "/Applications/AppPreview.app" to open.)