DarkModeToggle: new bar widget

Modules/Bar/Widgets/DarkModeToggle.qml

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+import Quickshell
+import qs.Commons
+import qs.Widgets
+import qs.Services
+
+NIconButton {
+  id: root
+
+  property ShellScreen screen
+  property real scaling: 1.0
+
+  icon: "contrast"
+  tooltipText: "Toggle light/dark mode"
+  sizeRatio: 0.8
+
+  colorBg: Color.mSurfaceVariant
+  colorFg: Color.mOnSurface
+  colorBorder: Color.transparent
+  colorBorderHover: Color.transparent
+
+  anchors.verticalCenter: parent.verticalCenter
+  onClicked: Settings.data.colorSchemes.darkMode = !Settings.data.colorSchemes.darkMode
+}