[AC] Switch to FiraMono Nerd Font, install prettier

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

setup_mac.sh

@@ -6,7 +6,8 @@
 # Distributed under terms of the MIT license.
 #
 
-brew install neovim tmux coreutils cmake golang jq npm virtualenvwrapper
+brew install neovim tmux coreutils cmake golang jq npm prettier virtualenvwrapper
+brew install --cask font-fira-mono-nerd-font
 ./install_alacritty_mac.sh
 BREW_PREFIX="$(brew --prefix)"
 source "$BREW_PREFIX/bin/virtualenvwrapper.sh"