- Set home-manager.backupFileExtension to 'backup'
- Automatically backs up files before home-manager overwrites them
- Prevents data loss when managing Firefox profiles.ini
- track nixpkgs at `github:NixOS/nixpkgs/nixpkgs-unstable` to pair with
`nix-darwin/master`
- update lockfile inputs: flake-compat, home-manager, NixOS-WSL,
nixpkgs, nixos-vscode-server
- darwin: wrap HM module in a function to access `lib` and
`mkForce` `home.homeDirectory = "/Users/danny"` (and set username) to
satisfy HM’s absolute-path requirement under root activation
- HM: comment out duplicated `home.username` / `home.homeDirectory` in
`home/danny/home.nix`
- HM: remove `neovim` and `tmux` from `home.packages` (managed via
`programs.*`), fixing conflicting `nvim` subpath error
