Resolve hawolex git enable flag

dotfiles/ps1/ps1.sh

@@ -143,6 +143,15 @@ _ps1_holiday() {
   echo "$holiday"
 }
 
+_ps1_git_enabled() {
+  _ps1_style_config
+  local v="${PS1_GIT:-0}"
+  case "$v" in
+    1|y|Y|yes|YES|true|TRUE|on|ON) echo "1" ;;
+    *) echo "0" ;;
+  esac
+}
+
 # ---- Load Git prompt helper (best effort) ----
 __try_source_git_prompt() {
   local candidates=(
@@ -641,7 +650,7 @@ ${G_Z2_BG}${G_Z2_FG} ${HOST_PART}${PATH_SEP}${G_PATH_FG}${PATH_PART}${G_END_PAD}
       local H_LEFT_FG="\[\e[38;5;54m\]"
       local H_RIGHT_FG="\[\e[38;5;31m\]"
       local H_GIT=""
-      local H_GIT_ON="${PS1_GIT:-$__PS1_GIT}"
+      local H_GIT_ON="$(_ps1_git_enabled)"
       if [[ "$H_GIT_ON" == "1" ]]; then
         export GIT_PS1_SHOWDIRTYSTATE=1
         export GIT_PS1_SHOWSTASHSTATE=1