* chore(modules): add tests for home-manager on darwin
* ci: use nix-fast-build for tests
this also enables the new darwin tests
* chore(tests): disable unsupported modules on darwin
* docs: add `tests` scope to CONTRIBUTING.md
* fix(home-manager): exclude `gtk.catppuccin.icon` from global enable
this was accidentally enabled by default only with `catppuccin.enable`
* fix(tests): build activationPackage for darwin
