fix: reduce shader usage

Components/VerticalFadeFlickable.qml

@@ -1,6 +1,7 @@
 pragma ComponentBehavior: Bound
 
 import QtQuick
+import Quickshell
 import qs.Effects
 
 CustomFlickable {
@@ -9,6 +10,7 @@ CustomFlickable {
 	property real bottomFadeOpacity: fadeShouldBeActive(false) ? 0 : 1
 	property real fadeAmount: 0.1
 	property real topFadeOpacity: fadeShouldBeActive(true) ? 0 : 1
+	readonly property real dpr: Math.ceil((QsWindow.window as QsWindow)?.devicePixelRatio ?? 1)
 
 	function fadeShouldBeActive(isStart: bool): bool {
 		// When content is smaller than flickable size, hide fade when rebound starts
@@ -28,6 +30,7 @@ CustomFlickable {
 			type: Anim.SlowEffects
 		}
 	}
+	// layer.textureSize: Qt.size(width * dpr, height * dpr)
 	layer.effect: Mask {
 		maskSource: mask