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/files/widgets/file_element.dart

@@ -1,10 +1,10 @@
 import 'package:filesize/filesize.dart';
 import 'package:flutter/material.dart';
-import 'package:jiffy/jiffy.dart';
 import 'package:nextcloud/nextcloud.dart';
 
 import '../../../../api/marianumcloud/webdav/queries/list_files/cacheable_file.dart';
 import '../../../../api/marianumcloud/webdav/webdav_api.dart';
+import '../../../../extensions/date_time.dart';
 import '../../../../model/endpoint_data.dart';
 import '../../../../routing/app_routes.dart';
 import '../../../../utils/download_manager.dart';
@@ -135,9 +135,10 @@ class _FileElementState extends State<FileElement> {
         ],
       );
     }
+    final modified = widget.file.modifiedAt ?? DateTime.now();
     return widget.file.isDirectory
-        ? Text('geändert ${Jiffy.parseFromDateTime(widget.file.modifiedAt ?? DateTime.now()).fromNow()}')
-        : Text('${filesize(widget.file.size)}, ${Jiffy.parseFromDateTime(widget.file.modifiedAt ?? DateTime.now()).fromNow()}');
+        ? Text('geändert ${modified.formatRelative()}')
+        : Text('${filesize(widget.file.size)}, ${modified.formatRelative()}');
   }
 
   void _onTap() {