Add display identification overlays

config/dot/quickshell/display-arrangement-harness.qml

@@ -3,8 +3,11 @@ import Quickshell.Io
 import QtQuick
 
 import qs.modules.settings
+import qs.services
 
 ShellRoot {
+    DisplayIdentify {}
+
     QtObject {
         id: fixtureService
 
@@ -71,5 +74,8 @@ ShellRoot {
                 name: record.name, x: record.x, y: record.y, primary: record.primary
             })));
         }
+
+        function identify(): void { Displays.identify(); }
+        function identifying(): bool { return Displays.identifying; }
     }
 }