Add display identification overlays

config/dot/quickshell/services/Displays.qml

@@ -43,6 +43,7 @@ Singleton {
     property int revertGeneration: -1
     property bool externalChangeBlocked: false
     property int secondsLeft: 0
+    property bool identifying: false
 
     readonly property bool awaitingConfirmation: root.pendingRequestedLayout !== null
     readonly property bool canConfirm: root.awaitingConfirmation
@@ -123,6 +124,11 @@ Singleton {
         return false;
     }
 
+    function identify(): void {
+        root.identifying = true;
+        identifyTimer.restart();
+    }
+
     function parse(text: string, generation: int): void {
         try {
             const raw = JSON.parse(text);
@@ -520,6 +526,13 @@ Singleton {
         root.lastError = "The previous display setting could not be verified. Open Displays and restore it manually.";
     }
 
+    Timer {
+        id: identifyTimer
+        interval: 3000
+        repeat: false
+        onTriggered: root.identifying = false
+    }
+
     Timer {
         id: verifyTimer
         property int attempts: 0