refactored data providers with centralized cache resolution, unified UI using custom dialogs and bottom sheets, and enhanced network error handling for Dio and TLS errors

lib/state/app/modules/files/data_provider/files_data_provider.dart

@@ -3,6 +3,7 @@ import 'package:nextcloud/nextcloud.dart';
 import '../../../../../api/marianumcloud/webdav/queries/list_files/list_files_cache.dart';
 import '../../../../../api/marianumcloud/webdav/queries/list_files/list_files_response.dart';
 import '../../../../../api/marianumcloud/webdav/webdav_api.dart';
+import '../../../../../api/request_cache.dart';
 
 class FilesDataProvider {
   /// Lists files at [path]. Cached payload is delivered via [onCacheData] as
@@ -14,22 +15,17 @@ class FilesDataProvider {
     String path, {
     void Function(ListFilesResponse)? onCacheData,
     void Function(Object)? onError,
-  }) async {
-    ListFilesResponse? latest;
-    Object? capturedError;
-    final cache = ListFilesCache(
-      path: path,
-      onUpdate: (data) => latest = data,
-      onCacheData: onCacheData,
-      onError: (e) {
-        capturedError = e;
-        onError?.call(e);
-      },
-    );
-    await cache.ready;
-    if (latest != null) return latest!;
-    throw capturedError ?? Exception('No data and no error from listFiles');
-  }
+  }) =>
+      resolveFromCache<ListFilesResponse>(
+        (onUpdate, onError) => ListFilesCache(
+          path: path,
+          onUpdate: onUpdate,
+          onCacheData: onCacheData,
+          onError: onError,
+        ),
+        onError: onError,
+        operationName: 'listFiles',
+      );
 
   Future<void> createFolder(String fullPath) async {
     final webdav = await WebdavApi.webdav;