fix: clean debug prints, ok tuslari Focus.onKeyEvent ile calisiyor

lib/services/image_manager.dart

@@ -43,18 +43,18 @@ class ImageManager extends ChangeNotifier {
     notifyListeners();
   }
 
-  void nextImage() {
-    if (_images.isEmpty) return;
-    _currentIndex = (_currentIndex + 1) % _images.length;
-    notifyListeners();
-  }
-
   void previousImage() {
     if (_images.isEmpty) return;
     _currentIndex = (_currentIndex - 1 + _images.length) % _images.length;
     notifyListeners();
   }
 
+  void nextImage() {
+    if (_images.isEmpty) return;
+    _currentIndex = (_currentIndex + 1) % _images.length;
+    notifyListeners();
+  }
+
   // Precache needs a BuildContext
   BuildContext? context;