Add NightLight, update README, format

Services/NightLightService.qml

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+pragma Singleton
+
+import QtQuick
+import Quickshell
+import Quickshell.Io
+import qs.Commons
+
+Singleton {
+  id: root
+
+  // Night Light properties - directly bound to settings
+  property bool enabled: Settings.data.nightLight?.enabled || false
+  property real warmth: (Settings.data.nightLight
+                         && Settings.data.nightLight.warmth !== undefined) ? Settings.data.nightLight.warmth : 0.6
+  property real intensity: (Settings.data.nightLight
+                            && Settings.data.nightLight.intensity !== undefined) ? Settings.data.nightLight.intensity : 0.8
+  property string startTime: Settings.data.nightLight?.startTime || "20:00"
+  property string stopTime: Settings.data.nightLight?.stopTime || "07:00"
+  property bool autoSchedule: Settings.data.nightLight?.autoSchedule !== false
+
+  // Computed properties
+  property color overlayColor: enabled ? calculateOverlayColor() : "transparent"
+  property bool isActive: enabled && (autoSchedule ? isWithinSchedule() : true)
+
+  Component.onCompleted: {
+    Logger.log("NightLight", "Service started")
+  }
+
+  function toggle() {
+    Settings.data.nightLight.enabled = !Settings.data.nightLight.enabled
+    Logger.log("NightLight", "Toggled:", Settings.data.nightLight.enabled)
+  }
+
+  function setWarmth(value) {
+    Settings.data.nightLight.warmth = Math.max(0.0, Math.min(1.0, value))
+    Logger.log("NightLight", "Warmth set to:", Settings.data.nightLight.warmth)
+  }
+
+  function setIntensity(value) {
+    Settings.data.nightLight.intensity = Math.max(0.0, Math.min(1.0, value))
+    Logger.log("NightLight", "Intensity set to:", Settings.data.nightLight.intensity)
+  }
+
+  function setSchedule(start, stop) {
+    Settings.data.nightLight.startTime = start
+    Settings.data.nightLight.stopTime = stop
+    Logger.log("NightLight", "Schedule set to:", Settings.data.nightLight.startTime, "-",
+               Settings.data.nightLight.stopTime)
+  }
+
+  function setAutoSchedule(auto) {
+    Settings.data.nightLight.autoSchedule = auto
+    Logger.log("NightLight", "Auto schedule set to:", Settings.data.nightLight.autoSchedule, "enabled:", enabled,
+               "isActive:", isActive, "withinSchedule:", isWithinSchedule())
+  }
+
+  function calculateOverlayColor() {
+    if (!isActive)
+      return "transparent"
+
+    // More vibrant color formula - stronger effect at high warmth
+    var red = 1.0
+    var green = 0.85 - warmth * 0.4 // More green reduction for stronger effect
+    var blue = 0.5 - warmth * 0.45 // More blue reduction for warmer feel
+    var alpha = 0.1 + warmth * 0.25 // Higher alpha for more noticeable effect
+
+    // Apply intensity
+    red = red * intensity
+    green = green * intensity
+    blue = blue * intensity
+
+    return Qt.rgba(red, green, blue, alpha)
+  }
+
+  function isWithinSchedule() {
+    if (!autoSchedule)
+      return true
+
+    var now = new Date()
+    var currentTime = now.getHours() * 60 + now.getMinutes()
+
+    var startParts = startTime.split(":")
+    var stopParts = stopTime.split(":")
+    var startMinutes = parseInt(startParts[0]) * 60 + parseInt(startParts[1])
+    var stopMinutes = parseInt(stopParts[0]) * 60 + parseInt(stopParts[1])
+
+    // Handle overnight schedule (e.g., 20:00 to 07:00)
+    if (stopMinutes < startMinutes) {
+      return currentTime >= startMinutes || currentTime <= stopMinutes
+    } else {
+      return currentTime >= startMinutes && currentTime <= stopMinutes
+    }
+  }
+
+  // Timer to check schedule changes
+  Timer {
+    interval: 60000 // Check every minute
+    running: true
+    repeat: true
+    onTriggered: {
+      if (autoSchedule && enabled) {
+        // Force overlay update when schedule changes
+        Logger.log("NightLight", "Schedule check - enabled:", enabled, "autoSchedule:", autoSchedule, "isActive:",
+                   isActive, "withinSchedule:", isWithinSchedule())
+      }
+    }
+  }
+}