Protect against nvim alias override

Closes #4558, #4559
Co-authored-by: @grumpydumpty

default/bash/aliases

@@ -37,7 +37,7 @@ alias cx='printf "\033[2J\033[3J\033[H" && claude --permission-mode=plan --allow
 alias d='docker'
 alias r='rails'
 alias t='tmux attach || tmux new -s Work'
-n() { if [ "$#" -eq 0 ]; then nvim .; else nvim "$@"; fi; }
+n() { if [ "$#" -eq 0 ]; then command nvim ; else command nvim "$@"; fi; }
 
 # Git
 alias g='git'