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/modules/home/views/home_page.dart

@@ -76,6 +76,7 @@ class HomePage extends HookConsumerWidget {
 
           imageGridGroup.add(
             DailyTitleText(
+              key: Key('${dateGroup.toString()}title'),
               isoDate: dateGroup,
               assetGroup: immichAssetList,
             ),