Create Styled things and finish notifications module

SysTrayWidget.qml

@@ -6,16 +6,18 @@ import Quickshell
 import Quickshell.Widgets
 import Quickshell.Services.SystemTray
 import qs.Common
+import qs.Common.Styled
 import qs.Services
 
-WrapperRectangle {
+BackgroundRectangle {
     id: systrayRoot
-    property string monitor: ""
-    rightMargin: Theme.gaps
-    leftMargin: Theme.gaps
-    radius: 25
 
-    color: Theme.backgroudColor
+    MarginWrapperManager {
+        rightMargin: Theme.gaps
+        leftMargin: Theme.gaps
+    }
+
+    property string monitor: ""
 
     // color: Theme.backgroudColor
     RowLayout {