installer: avoid gsettings in chrooted installs

bin/omarchy-theme-set-gnome

@@ -3,6 +3,13 @@
 # omarchy:summary=Apply the current theme to GNOME color mode and icon settings
 # omarchy:hidden=true
 
+# gsettings needs a user DBus session. During ISO installs this command can be
+# reached from arch-chroot while applying the initial Omarchy theme; defer until
+# the user has a real session instead of emitting dconf warnings.
+if [[ -z ${DBUS_SESSION_BUS_ADDRESS:-} ]]; then
+  exit 0
+fi
+
 THEME_DIR=~/.config/omarchy/current/theme
 COLORS_FILE="$THEME_DIR/colors.toml"