simplified code across the app and consolidated duplicated helpers

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

@@ -3,6 +3,7 @@ import 'package:flutter/foundation.dart';
 import '../../../../api/marianumcloud/search/search_files.dart';
 import '../../../../api/marianumcloud/webdav/queries/list_files/cacheable_file.dart';
 import '../../../../utils/debouncer.dart';
+import '../data/webdav_path.dart';
 import 'local_cache_search.dart';
 
 /// Holds the live state of a Files-search session: current query, the latest
@@ -28,12 +29,11 @@ class FilesSearchController extends ChangeNotifier {
   bool _disposed = false;
   Future<List<CacheableFile>>? _localIndex;
 
-  Future<List<CacheableFile>> _searchLocal(List<String> pathScope) async =>
-      searchLocalCacheIndex(
-        await (_localIndex ??= loadLocalCacheIndex()),
-        _query,
-        pathScope: pathScope,
-      );
+  Future<List<CacheableFile>> _searchLocal() async => searchLocalCacheIndex(
+    await (_localIndex ??= loadLocalCacheIndex()),
+    _query,
+    pathScope: _pathScope,
+  );
 
   /// Guards against the race where the search delegate is closed (and the
   /// controller disposed) while a debounced cache scan or server call is
@@ -45,10 +45,7 @@ class FilesSearchController extends ChangeNotifier {
   }
 
   String get query => _query;
-  List<String> get pathScope => List.unmodifiable(_pathScope);
   bool get isScoped => _pathScope.isNotEmpty;
-  List<CacheableFile> get cacheResults => _cacheResults;
-  List<CacheableFile> get serverResults => _serverResults;
   bool get serverLoading => _serverLoading;
   Object? get serverError => _serverError;
 
@@ -81,18 +78,7 @@ class FilesSearchController extends ChangeNotifier {
       _safeNotify();
       return;
     }
-    // Show loading immediately — even before the (typically fast) cache
-    // scan resolves — so the indicator is visible the moment the user
-    // starts typing rather than after the first await hop.
-    _serverLoading = true;
-    _serverError = null;
-    _safeNotify();
-
-    final cacheHits = await _searchLocal(_pathScope);
-    if (epoch != _serverEpoch) return;
-    _cacheResults = cacheHits;
-    _safeNotify();
-    _scheduleServerCall();
+    await _searchLocalThenServer(epoch);
   }
 
   /// Drops the path filter and re-runs the current search globally. Used by
@@ -105,11 +91,18 @@ class FilesSearchController extends ChangeNotifier {
       _safeNotify();
       return;
     }
+    await _searchLocalThenServer(epoch);
+  }
+
+  Future<void> _searchLocalThenServer(int epoch) async {
+    // Show loading immediately — even before the (typically fast) cache
+    // scan resolves — so the indicator is visible the moment the user
+    // starts typing rather than after the first await hop.
     _serverLoading = true;
     _serverError = null;
     _safeNotify();
 
-    final cacheHits = await _searchLocal(const []);
+    final cacheHits = await _searchLocal();
     if (epoch != _serverEpoch) return;
     _cacheResults = cacheHits;
     _safeNotify();
@@ -135,7 +128,7 @@ class FilesSearchController extends ChangeNotifier {
   Future<void> _runServerCall() async {
     final epoch = _serverEpoch;
     final term = _query;
-    final scopePrefix = _pathScope.isEmpty ? '' : '${_pathScope.join('/')}/';
+    final scopePrefix = webdavFolderPath(_pathScope);
     try {
       final response = await _api.run(term: term);
       if (epoch != _serverEpoch) return;