qs: add wallpaper cycling functionality

config/quickshell/.config/quickshell/Services/IPCService.qml

@@ -34,6 +34,10 @@ Item {
             BackgroundService.setWallpaper(path);
         }
 
+        function next() {
+            WallpaperCycle.applyNext();
+        }
+
         target: "background"
     }
 

config/quickshell/.config/quickshell/Services/SettingsService.qml

@@ -13,6 +13,7 @@ Singleton {
     property alias location: adapter.location
     property alias backgroundPath: adapter.backgroundPath
     property alias wifiEnabled: adapter.wifiEnabled
+    property alias cycleWallpapers: adapter.cycleWallpapers
 
     FileView {
         id: settingFile
@@ -34,6 +35,7 @@ Singleton {
             property string location: "New York"
             property string backgroundPath: ""
             property bool wifiEnabled: true
+            property list<string> cycleWallpapers: []
         }
 
     }

config/quickshell/.config/quickshell/Services/WallpaperCycle.qml

@@ -0,0 +1,56 @@
+import QtQuick
+import Quickshell
+import Quickshell.Io
+import qs.Utils
+pragma Singleton
+
+Singleton {
+    id: root
+
+    property int cycleInterval: 900 // in seconds
+    property var wallpapers: SettingsService.cycleWallpapers
+
+    function applyNext() {
+        if (root.wallpapers.length === 0) {
+            Logger.w("WallpaperCycle", "No wallpapers to cycle through, skipping.");
+            return ;
+        }
+        cycleTimer.stop();
+        const current = SettingsService.backgroundPath;
+        let index = -1;
+        if (current) {
+            for (let i = 0; i < root.wallpapers.length; i++) {
+                if (root.wallpapers[i] === current) {
+                    index = i;
+                    break;
+                }
+            }
+        }
+        if (index === -1) {
+            Logger.w("WallpaperCycle", "Current wallpaper not found in cycle list, starting from the beginning.");
+            index = 0;
+        } else {
+            index = (index + 1) % root.wallpapers.length;
+        }
+        const nextWallpaper = root.wallpapers[index];
+        Logger.i("WallpaperCycle", "Cycling to next wallpaper: " + nextWallpaper);
+        _apply(nextWallpaper);
+        cycleTimer.start();
+    }
+
+    function _apply(path) {
+        Quickshell.execDetached(["sh", "-c", "wallreel -a '" + path + "'"]);
+    }
+
+    Timer {
+        id: cycleTimer
+
+        running: false
+        repeat: true
+        interval: root.cycleInterval * 1000
+        onTriggered: {
+            root.applyNext();
+        }
+    }
+
+}

config/quickshell/.config/quickshell/shell.qml

@@ -23,6 +23,7 @@ ShellRoot {
             Component.onCompleted: {
                 SunsetService;
                 NotesService;
+                WallpaperCycle;
             }
 
             IPCService {