fix: Ensure nvm loading only occurs if nvm is available

dotfiles/.zshrc

@@ -100,6 +100,8 @@ export NVM_DIR="$HOME/.nvm"
 [ -s "$NVM_DIR/bash_completion" ] && \. "$NVM_DIR/bash_completion"  # This loads nvm bash_completion
 
 # Automatically use node version specified in .nvmrc if present
+# Only enable if nvm is loaded
+if command -v nvm_find_nvmrc > /dev/null 2>&1; then
   autoload -U add-zsh-hook
   load-nvmrc() {
     local nvmrc_path="$(nvm_find_nvmrc)"
@@ -116,6 +118,7 @@ load-nvmrc() {
   }
   add-zsh-hook chpwd load-nvmrc
   load-nvmrc
+fi
 
 [[ -s $HOME/.autojump/etc/profile.d/autojump.sh ]] && source $HOME/.autojump/etc/profile.d/autojump.sh