Unify config into shell.json and add Noctalia plugin support

default/quickshell/omarchy-shell/Widgets/NBox.qml

@@ -0,0 +1,9 @@
+import QtQuick
+import qs.Commons
+
+Rectangle {
+  color: Color.mSurfaceVariant
+  border.color: Color.mOutline
+  border.width: Style.borderS
+  radius: Style.radiusM
+}