fix: incorrect asset viewer scale on image frame update (#25430)

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/widgets/photo_view/src/controller/photo_view_controller.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 
 import 'package:flutter/widgets.dart';
 import 'package:immich_mobile/widgets/photo_view/src/utils/ignorable_change_notifier.dart';
+import 'package:immich_mobile/widgets/photo_view/src/utils/photo_view_utils.dart';
 
 /// The interface in which controllers will be implemented.
 ///
@@ -62,6 +63,9 @@ abstract class PhotoViewControllerBase<T extends PhotoViewControllerValue> {
   /// The scale factor to transform the child (image or a customChild).
   late double? scale;
 
+  double? get initialScale;
+  ScaleBoundaries? scaleBoundaries;
+
   /// Nevermind this method :D, look away
   void setScaleInvisibly(double? scale);
 
@@ -141,6 +145,9 @@ class PhotoViewController implements PhotoViewControllerBase<PhotoViewController
 
   late StreamController<PhotoViewControllerValue> _outputCtrl;
 
+  @override
+  ScaleBoundaries? scaleBoundaries;
+
   late void Function(Offset)? _animatePosition;
   late void Function(double)? _animateScale;
   late void Function(double)? _animateRotation;
@@ -311,4 +318,7 @@ class PhotoViewController implements PhotoViewControllerBase<PhotoViewController
     }
     _valueNotifier.value = newValue;
   }
+
+  @override
+  double? get initialScale => scaleBoundaries?.initialScale ?? initial.scale;
 }