#2243 feat(nixos): add Orca desktop AppImage for Linux

Summary

• Add orca-desktop overlay wrapping the Orca AppImage (v1.4.168) with appimageTools.wrapType2
• Supports both x86_64 and aarch64 Linux
• Add to Linux desktop packages list (isLinux && isDesktop)
• Installs .desktop file and icons from the AppImage

Test plan

• darwin build passes (overlay parses cleanly)
• nixos-rebuild switch on matic installs orca-desktop

Generated with Claude Code

https://claude.ai/code/session_01CvLckVfp8KatB5BBJw5GGt

---

Summary by cubic

Adds orca-desktop AppImage (v1.4.168) as a Nix overlay and includes it in the Linux desktop package set. Also bumps moshi-hook to 0.2.70.

• New Features

  • Added orca-desktop overlay using appimageTools.wrapType2 for x86_64 and aarch64 Linux.
  • Installed .desktop file and icons; Exec updated to call the wrapped binary.
  • Included orca-desktop in home-manager packages for Linux desktops.

• Dependencies

  • Updated moshi-hook to 0.2.70 with refreshed hashes.