simplified code across the app and consolidated duplicated helpers

lib/view/pages/files/search/files_search_results.dart

@@ -11,6 +11,7 @@ import '../../../../state/app/infrastructure/loadable_state/view/loadable_state_
 import '../../../../state/app/infrastructure/loadable_state/view/loadable_state_primary_loading.dart';
 import '../../../../state/app/infrastructure/utility_widgets/bloc_module.dart';
 import '../../../../widget/placeholder_view.dart';
+import '../data/webdav_path.dart';
 import '../widgets/file_element.dart';
 import 'files_search_controller.dart';
 
@@ -80,8 +81,8 @@ class FilesSearchResults extends StatelessWidget {
                 visible: showErrorScreen,
                 message: errorMessage,
               ),
-              if (showEmpty) _emptyState(context),
-              if (hasContent) _resultList(context, combined),
+              if (showEmpty) _emptyState(),
+              if (hasContent) _resultList(combined),
             ],
           ),
         ),
@@ -89,7 +90,7 @@ class FilesSearchResults extends StatelessWidget {
     );
   }
 
-  Widget _emptyState(BuildContext context) => PlaceholderView(
+  Widget _emptyState() => PlaceholderView(
     icon: Icons.search_off_outlined,
     text: 'Keine Treffer gefunden.',
     button: controller.isScoped
@@ -101,7 +102,7 @@ class FilesSearchResults extends StatelessWidget {
         : null,
   );
 
-  Widget _resultList(BuildContext context, List<CacheableFile> combined) {
+  Widget _resultList(List<CacheableFile> combined) {
     final groups = _groupByParent(combined);
     final orderedKeys = groups.keys.toList()..sort();
     // Flat (folder header | file) rows built lazily: results can run into
@@ -117,7 +118,7 @@ class FilesSearchResults extends StatelessWidget {
       itemCount: rows.length,
       itemBuilder: (context, index) {
         final (folder, file) = rows[index];
-        final segments = _segmentsOf(folder);
+        final segments = webdavSegmentsOf(folder);
         if (file == null) {
           return _FolderHeader(
             key: ValueKey('folder:$folder'),
@@ -139,29 +140,14 @@ class FilesSearchResults extends StatelessWidget {
     );
   }
 
-  static final RegExp _edgeSlashes = RegExp(r'^/+|/+$');
-
   Map<String, List<CacheableFile>> _groupByParent(List<CacheableFile> files) {
     final map = <String, List<CacheableFile>>{};
     for (final file in files) {
-      map.putIfAbsent(_parentOf(file), () => []).add(file);
+      final parent = '/${webdavParentSegmentsOf(file.path).join('/')}';
+      map.putIfAbsent(parent, () => []).add(file);
     }
     return map;
   }
-
-  String _parentOf(CacheableFile file) {
-    final stripped = file.path.replaceAll(_edgeSlashes, '');
-    final segments = stripped.split('/');
-    if (segments.length <= 1) return '/';
-    segments.removeLast();
-    return '/${segments.join('/')}';
-  }
-
-  List<String> _segmentsOf(String folder) {
-    final stripped = folder.replaceAll(_edgeSlashes, '');
-    if (stripped.isEmpty) return const [];
-    return stripped.split('/');
-  }
 }
 
 class _FolderHeader extends StatelessWidget {