solid group backgrounds, glow shader on gradient border

modules/Bar.qml

@@ -1,4 +1,5 @@
 import QtQuick
+import QtQuick.Effects
 import QtQuick.Layouts
 import Quickshell
 import Quickshell.Wayland
@@ -28,7 +29,9 @@ PanelWindow {
     }
 
     Canvas {
+        id: borderCanvas
         anchors.fill: parent
+        visible: false
 
         onPaint: {
             const ctx = getContext("2d");
@@ -94,6 +97,16 @@ PanelWindow {
         }
     }
 
+    MultiEffect {
+        source: borderCanvas
+        anchors.fill: borderCanvas
+        shadowEnabled: true
+        shadowColor: M.Theme.base0D
+        shadowBlur: 0.4
+        shadowVerticalOffset: 2
+        shadowHorizontalOffset: 0
+    }
+
     Item {
         anchors.fill: parent
         anchors.topMargin: 3