Rename the Color singleton to avoid the Qt 6.12 clash

shell/plugins/bar/widgets/ActiveWindow.qml

@@ -34,7 +34,7 @@ BarWidget {
       anchors.left: parent.left
       width: parent.width
       text: root.title
-      color: root.bar ? root.bar.barForeground : Color.foreground
+      color: root.bar ? root.bar.barForeground : Colors.foreground
       font.family: root.bar ? root.bar.fontFamily : Style.font.family
       font.pixelSize: Style.font.body
       elide: Text.ElideRight

shell/plugins/bar/widgets/Tray.qml

@@ -16,7 +16,7 @@ BarWidget {
   property bool trayMenuOpen: false
   property var activeTrayItem: null
   property var activeTrayAnchor: null
-  readonly property color foreground: bar ? bar.foreground : Color.foreground
+  readonly property color foreground: bar ? bar.foreground : Colors.foreground
   readonly property string fontFamily: bar ? bar.fontFamily : Style.font.family
   readonly property var pinnedIds: settings.pinned instanceof Array ? settings.pinned : []
   readonly property var hiddenIds: settings.hidden instanceof Array ? settings.hidden : []
@@ -617,7 +617,7 @@ BarWidget {
             anchors.rightMargin: Style.space(10)
             anchors.verticalCenter: parent.verticalCenter
             height: 1
-            color: Color.popups.border
+            color: Colors.popups.border
             opacity: 0.45
           }
         }
@@ -671,7 +671,7 @@ BarWidget {
                 anchors.rightMargin: Style.space(10)
                 anchors.verticalCenter: parent.verticalCenter
                 height: 1
-                color: Color.popups.border
+                color: Colors.popups.border
                 opacity: 0.45
               }