Separate transparent bar foreground from panel text

shell/Ui/Panel.qml

@@ -1,5 +1,6 @@
 import QtQuick
 import Quickshell.Io
+import qs.Commons
 
 // Base item for plugin popup widgets. Many first-party plugins expose a bar
 // button plus a popup from one QML entry point; this base owns the shared
@@ -18,6 +19,7 @@ Item {
   property bool popoutSwitchClosing: false
 
   readonly property bool opened: panelController.open
+  readonly property color barForeground: bar ? bar.barForeground : Color.foreground
 
   function open() { panelController.show() }
   function close() { panelController.hide() }