use coreutils cat in menu command

**Describe the bug** https://github.com/numtide/devshell/blob/7c9e793ebe66bcba8292989a68c0419b737a22a0/modules/commands.nix#L177 Here, `cat` is usually coreutils cat but it should ideally be using `${pkgs.coreutils}/bin/cat` instead. **To Reproduce** Steps to reproduce the behavior: 1. Alias cat to [bat](https://github.com/sharkdp/bat) somwhere 2. save this minimal config in shell.nix ```nix let devshell = import (builtins.fetchTarball { url = "https://github.com/numtide/devshell/archive/7c9e793ebe66bcba8292989a68c0419b737a22a0.tar.gz"; sha256 = "sha256:165601skgrlgvgr4h7hjbz80zp7zpn7z2c7qjh6bal8hmjmmlqwi"; }) { }; in devshell.mkShell { } ``` 3. run shell via nix-shell 4. bat is used and thus output contains lines etc. **Expected behavior** cat should be used **System information** - system: `"x86_64-linux"` - host os: `Linux 6.12.21, NixOS, 25.05 (Warbler), 25.05pre-git` - multi-user?: `yes` - sandbox: `yes` - version: `nix-env (Nix) 2.27.0pre20250304_271926a` - nixpkgs: `/nix/store/fwhfa9pbx8vdi8nd5pcys665baz6xdxf-source` **Additional context** maybe needs to be changed elsewhere too wherever `cat` is used.