Created Hook system (let's users run commands after specific actions)

NInputAction: create NTextInput with NButton
HooksService: add dark/light mode hook, add wallpaper change hook
HooksTab: create 1 NInputAction for each hook
Wallpaper: add hook functionallity

Services/WallpaperService.qml

@@ -256,6 +256,11 @@ Singleton {
     // Update cache directly
     currentWallpapers[screenName] = path
 
+    // Execute wallpaper change hook
+    if (HooksService) {
+      HooksService.executeWallpaperHook(path)
+    }
+
     // Update Settings - still need immutable update for Settings persistence
     // The slice() ensures Settings detects the change and saves properly
     var monitors = Settings.data.wallpaper.monitors || []