Promote cornerRadius + focus tokens to qs.Commons.Style singleton

default/quickshell/omarchy-shell/Ui/KeyboardPanel.qml

@@ -193,7 +193,7 @@ PanelWindow {
     color: Color.popups.background
     border.color: Color.popups.border
     border.width: 2
-    radius: 0
+    radius: Style.cornerRadius
     opacity: root.open ? 1.0 : 0
     Behavior on opacity {
       NumberAnimation { duration: 140; easing.type: Easing.OutCubic }