refactored broad range of the application, split files, modularized calendar and file views, centralized bottom sheets and clipboard handling, and implemented unit test coverage

lib/view/pages/timetable/custom_events/custom_events_view.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:jiffy/jiffy.dart';
 
+import '../../../../extensions/date_time.dart';
 import '../../../../state/app/infrastructure/loadable_state/view/loadable_state_consumer.dart';
 import '../../../../state/app/modules/timetable/bloc/timetable_bloc.dart';
 import '../../../../state/app/modules/timetable/bloc/timetable_state.dart';
@@ -51,7 +51,7 @@ class CustomEventsView extends StatelessWidget {
                     title: Text(e.title),
                     subtitle: Text(
                       '${e.rrule.isNotEmpty ? "wiederholend, " : ""}'
-                      'beginnend ${Jiffy.parseFromDateTime(e.startDate).fromNow()}',
+                      'beginnend ${e.startDate.formatRelative()}',
                     ),
                     leading: CenteredLeading(Icon(e.rrule.isEmpty ? Icons.event_outlined : Icons.event_repeat_outlined)),
                     trailing: Row(