Add display identification overlays

config/dot/quickshell/modules/settings/DisplayArrangement.qml

@@ -279,7 +279,8 @@ Item {
             spacing: 8
 
             Text {
-                width: Math.max(0, parent.width - primaryButton.width - applyButton.width - 16)
+                width: Math.max(0, parent.width - identifyButton.width
+                    - primaryButton.width - applyButton.width - 24)
                 anchors.verticalCenter: parent.verticalCenter
                 text: root.width >= 600
                     ? "Drag to arrange · arrows move 10 px · Shift moves 100 px"
@@ -290,6 +291,13 @@ Item {
                 elide: Text.ElideRight
             }
 
+            SettingsButton {
+                id: identifyButton
+                text: "Identify"
+                enabled: root.interactionEnabled
+                onClicked: root.displayService.identify()
+            }
+
             SettingsButton {
                 id: primaryButton
                 text: "Make primary"