fix: reset override for kebab buttons (#29380)

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

mobile/lib/presentation/widgets/asset_viewer/viewer_top_app_bar.widget.dart

@@ -63,7 +63,7 @@ class ViewerTopAppBar extends ConsumerWidget implements PreferredSizeWidget {
 
       ActionIconButtonWidget(action: FavoriteAction(assets: assetForAction)),
 
-      ViewerKebabMenu(originalTheme: originalTheme),
+      ImmichColorOverride(color: null, child: ViewerKebabMenu(originalTheme: originalTheme)),
     ];
 
     final lockedViewActions = <Widget>[ViewerKebabMenu(originalTheme: originalTheme)];

mobile/packages/ui/lib/src/color_override.dart

@@ -3,7 +3,7 @@ import 'package:flutter/widgets.dart';
 class ImmichColorOverride extends InheritedWidget {
   const ImmichColorOverride({super.key, required this.color, required super.child});
 
-  final Color color;
+  final Color? color;
 
   static Color? maybeOf(BuildContext context) =>
       context.dependOnInheritedWidgetOfExactType<ImmichColorOverride>()?.color;