chore: update appcast for 4.2.1

chore: note button mapping fix in 4.2.0 notes

Update SKILL.md

chore: release 4.0.1 — bump version, update appcast, fix release scripts

- Bump version to 4.0.1 (build 20260308.1)
- Update appcast with signed 4.0.1 entry
- Fix update_appcast.sh: prefer root app Info.plist over nested framework plists
- Fix update_appcast.sh: remove extra closing paren
- Fix create_gh_draft.sh: handle empty PRERELEASE array with set -u

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Update project.pbxproj

Merge branch 'master' of https://github.com/Caldis/Mos

feat: update icon

chore: update build version

chore: bump version

feat: add dmg script and assets