Time: detect time jumps to fix nightlight/darkmode logic (#1599)

Commons/Time.qml

@@ -11,6 +11,12 @@ Singleton {
   // Current date
   property var now: new Date()
 
+  // Unix timestamp of the last update
+  property real _lastUpdateTs: Date.now()
+
+  // Signal emitted when a significant time jump is detected (e.g. system resume)
+  signal resumed
+
   // Returns a Unix Timestamp (in seconds)
   readonly property int timestamp: {
     return Math.floor(root.now / 1000);
@@ -34,6 +40,15 @@ Singleton {
     triggeredOnStart: false
     onTriggered: {
       var newTime = new Date();
+      var currentTs = newTime.getTime();
+
+      // Detect time jump (e.g. system resume) - threshold: 5 seconds
+      if (currentTs - root._lastUpdateTs > 5000) {
+        Logger.i("Time", "Time jump detected (" + Math.round((currentTs - root._lastUpdateTs) / 1000) + "s) - likely system resume");
+        root.resumed();
+      }
+      root._lastUpdateTs = currentTs;
+
       root.now = newTime;
 
       // Update timer if running

Services/Location/DarkModeService.qml

@@ -43,7 +43,15 @@ Singleton {
   Connections {
     target: Settings.data.colorSchemes
     function onSchedulingModeChanged() {
-      root.init();
+      root.update();
+    }
+  }
+
+  Connections {
+    target: Time
+    function onResumed() {
+      Logger.i("DarkModeService", "System resumed - re-evaluating dark mode");
+      root.update();
     }
   }
 
@@ -51,24 +59,22 @@ Singleton {
     id: timer
     onTriggered: {
       Settings.data.colorSchemes.darkMode = root.nextDarkModeState;
-      if (LocationService.data.weather !== null) {
-        const changes = root.collectWeatherChanges(LocationService.data.weather);
-        root.scheduleNextMode(changes);
-      }
+      root.update();
     }
   }
 
   function init() {
     Logger.i("DarkModeService", "Service started");
+    root.update();
+  }
 
+  function update() {
     if (Settings.data.colorSchemes.schedulingMode == "manual") {
       const changes = collectManualChanges();
       initComplete = true;
       applyCurrentMode(changes);
       scheduleNextMode(changes);
-    }
-
-    if (Settings.data.colorSchemes.schedulingMode == "location" && LocationService.data.weather) {
+    } else if (Settings.data.colorSchemes.schedulingMode == "location" && LocationService.data.weather) {
       const changes = collectWeatherChanges(LocationService.data.weather);
       initComplete = true;
       applyCurrentMode(changes);

Services/Location/NightLightService.qml

@@ -85,11 +85,19 @@ Singleton {
     target: LocationService
     function onCoordinatesReadyChanged() {
       if (LocationService.coordinatesReady) {
-        apply();
+        root.apply();
       }
     }
   }
 
+  Connections {
+    target: Time
+    function onResumed() {
+      Logger.i("NightLight", "System resumed - re-applying night light");
+      root.apply();
+    }
+  }
+
   // Foreground process runner
   Process {
     id: runner