zsh: guard source of zsh-functions against missing file

zsh/zshrc

@@ -15,8 +15,7 @@ export ZSHRC_BOOTSTRAP="$ZSH_CONFIG/.bootstrapped"
 [[ -d "$HOME/AppImages" ]] && path+=("$HOME/AppImages")
 [[ -d "$HOME/.opencode/bin" ]] && path+=("$HOME/.opencode/bin")
 
-ZSHRC_FUNCTIONS="$ZSH_CONFIG/zsh-functions.zsh"
-source "$ZSHRC_FUNCTIONS"
+[[ -f "$ZSH_CONFIG/zsh-functions.zsh" ]] && source "$ZSH_CONFIG/zsh-functions.zsh"
 
 # Bootstrap: installs missing CLI tools and oh-my-zsh plugins across distros.
 if [[ ! -f "$ZSHRC_BOOTSTRAP" || "$(cat "$ZSHRC_BOOTSTRAP" 2>/dev/null)" != "$ZSHRC_BOOTSTRAP_VERSION" || "$BOOTSTRAP" == "true" ]]; then
@@ -152,9 +151,9 @@ if [[ -o interactive && "$ZSHRC_UPDATE_DISABLED" != "true" ]]; then
   # zsh-functions
   ftmp=/tmp/.zsh-functions.$$
   if curl -fsSL --connect-timeout 3 --max-time 8 "$ZSHRC_GIT/zsh-functions.zsh" -o "$ftmp" 2>/dev/null \
-      && [[ -f "$ftmp" ]] && ! cmp -s "$ftmp" "$ZSHRC_FUNCTIONS" 2>/dev/null; then
+      && [[ -f "$ftmp" ]] && ! cmp -s "$ftmp" "$ZSH_CONFIG/zsh-functions.zsh" 2>/dev/null; then
     echo "Updating zsh-functions..."
-    mv "$ftmp" "$ZSHRC_FUNCTIONS"
+    mv "$ftmp" "$ZSH_CONFIG/zsh-functions.zsh"
   else
     rm -f "$ftmp"
   fi