Add NightLight, update README, format

Modules/NightLight/NightLight.qml

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+import QtQuick
+import Quickshell
+import Quickshell.Wayland
+import qs.Commons
+import qs.Services
+
+Variants {
+  model: Quickshell.screens
+
+  delegate: Loader {
+    required property ShellScreen modelData
+    readonly property real scaling: ScalingService.scale(modelData)
+
+    active: NightLightService.enabled
+
+    sourceComponent: PanelWindow {
+      id: nightlightWindow
+
+      screen: modelData
+      visible: NightLightService.isActive
+      color: Color.transparent
+
+      mask: Region {}
+
+      anchors {
+        top: true
+        bottom: true
+        left: true
+        right: true
+      }
+
+      WlrLayershell.layer: WlrLayershell.Overlay
+      WlrLayershell.exclusionMode: ExclusionMode.Ignore
+      WlrLayershell.keyboardFocus: WlrKeyboardFocus.None
+      WlrLayershell.namespace: "noctalia-nightlight"
+
+      Rectangle {
+        anchors.fill: parent
+        color: NightLightService.overlayColor
+      }
+
+      // Safe connection that checks if the window still exists
+      Connections {
+        target: NightLightService
+        function onIsActiveChanged() {
+          if (nightlightWindow && typeof nightlightWindow.visible !== 'undefined') {
+            nightlightWindow.visible = NightLightService.isActive
+          }
+        }
+      }
+
+      // Cleanup when component is being destroyed
+      Component.onDestruction: {
+        Logger.log("NightLight", "PanelWindow being destroyed")
+      }
+    }
+
+    // Safe state changes
+    onActiveChanged: {
+      if (!active) {
+        Logger.log("NightLight", "Loader deactivating for screen:", modelData.name)
+      }
+    }
+  }
+}