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/view/pages/files/files_upload_dialog.dart

@@ -7,6 +7,7 @@ import 'package:nextcloud/nextcloud.dart';
 import '../../../api/marianumcloud/webdav/webdav_api.dart';
 import '../../../widget/confirm_dialog.dart';
 import '../../../widget/focus_behaviour.dart';
+import '../../../widget/info_dialog.dart';
 
 class FilesUploadDialog extends StatefulWidget {
   final List<String> filePaths;
@@ -47,20 +48,12 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
     }).toList();
   }
 
-  void showHttpErrorCode(int httpErrorCode){
-    showDialog(
-      context: context,
-      builder: (BuildContext context) => AlertDialog(
-          title: const Text('Ein Fehler ist aufgetreten'),
-          contentPadding: const EdgeInsets.all(10),
-          content: Text('Error code: $httpErrorCode'),
-          actions: [
-            TextButton(
-              onPressed: () => Navigator.of(context).pop(),
-              child: const Text('Schließen', textAlign: TextAlign.center),
-            ),
-          ],
-        )
+  void showHttpErrorCode(int httpErrorCode) {
+    InfoDialog.show(
+      context,
+      'Error code: $httpErrorCode',
+      title: 'Ein Fehler ist aufgetreten',
+      copyable: true,
     );
   }
 
@@ -70,20 +63,7 @@ class _FilesUploadDialogState extends State<FilesUploadDialog> {
       _overallProgressValue = 0.0;
       _infoText = '';
     });
-    showDialog(
-      context: context,
-      builder: (BuildContext context) => AlertDialog(
-        title: const Text('Upload fehlgeschlagen'),
-        contentPadding: const EdgeInsets.all(10),
-        content: Text(message),
-        actions: [
-          TextButton(
-            onPressed: () => Navigator.of(context).pop(),
-            child: const Text('Schließen', textAlign: TextAlign.center),
-          ),
-        ],
-      ),
-    );
+    InfoDialog.show(context, message, title: 'Upload fehlgeschlagen', copyable: true);
   }
 
   Future<void> uploadFiles({bool override = false}) async {