Mobile performance improvements (#417)

* First performance tweaks (caching and rendering improvemetns)

* Revert asset response caching

* 3-step image loading in asset viewer

* Prevent panning and zooming until full-scale version is loaded

* Loading indicator

* Adapt to gallery PR

* Cleanup

* Dart format

* Fix exif sheet

* Disable three stage loading until settings are available

mobile/lib/main.dart

@@ -1,6 +1,8 @@
 import 'package:easy_localization/easy_localization.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
+import 'package:flutter_displaymode/flutter_displaymode.dart';
 import 'package:hive_flutter/hive_flutter.dart';
 import 'package:hooks_riverpod/hooks_riverpod.dart';
 import 'package:immich_mobile/constants/immich_colors.dart';
@@ -49,6 +51,10 @@ void main() async {
     Locale('it', 'IT'),
   ];
 
+  if (kReleaseMode) {
+    await FlutterDisplayMode.setHighRefreshRate();
+  }
+
   runApp(
     EasyLocalization(
       supportedLocales: locales,