Normalize Activity application architecture

lib/cubit/settings/settings_activity_cubit.dart

lib/cubit/settings/settings_activity_state.dart

lib/cubit/settings/settings_global_cubit.dart

lib/cubit/settings/settings_global_state.dart

lib/main.dart

lib/models/settings/settings_activity.dart

lib/ui/nav/global_app_bar.dart

lib/ui/skeleton.dart

lib/ui/widgets/activity/activity_bottom.dart

lib/ui/widgets/activity/activity_content.dart

lib/ui/widgets/keyboard.dart

lib/utils/api.dart

pubspec.lock

pubspec.yaml