Improve title bar, add "refresh" button

android/gradle.properties

fastlane/metadata/android/en-US/changelogs/11.txt

fastlane/metadata/android/fr-FR/changelogs/11.txt

lib/network/scrobbles_api.dart

lib/ui/screens/main_screen.dart

lib/ui/screens/skeleton_screen.dart

lib/ui/widgets/app_bar.dart

lib/ui/widgets/header.dart

lib/ui/widgets/main_screen/statistics_card.dart

pubspec.lock

pubspec.yaml