Fix download: fetch file with auth header, create blob for proper download

b0esche_cloud/lib/pages/file_explorer.dart

@@ -1,9 +1,11 @@
 import 'dart:ui';
+import 'dart:js_interop';
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:file_picker/file_picker.dart' hide FileType;
 import 'package:path/path.dart' as p;
 import 'package:web/web.dart' as web;
+import 'package:http/http.dart' as http;
 import '../blocs/file_browser/file_browser_bloc.dart';
 import '../blocs/file_browser/file_browser_event.dart';
 import '../blocs/file_browser/file_browser_state.dart';
@@ -303,14 +305,14 @@ class _FileExplorerState extends State<FileExplorer> {
               const SizedBox(width: 12),
               Expanded(
                 child: Text(
-                  'Preparing download: ${file.name}',
+                  'Downloading: ${file.name}',
                   overflow: TextOverflow.ellipsis,
                   style: const TextStyle(color: AppTheme.primaryText),
                 ),
               ),
             ],
           ),
-          duration: const Duration(seconds: 3),
+          duration: const Duration(days: 1), // Keep showing until dismissed
           backgroundColor: AppTheme.primaryBackground,
         ),
       );
@@ -335,16 +337,39 @@ class _FileExplorerState extends State<FileExplorer> {
         file.path,
       );
 
-      // Build full URL with token for authentication (anchor elements can't send headers)
+      // Build full URL
-      final fullUrl =
+      final fullUrl = '${fileService.baseUrl}$downloadUrl';
-          '${fileService.baseUrl}$downloadUrl&token=${Uri.encodeComponent(token)}';
 
-      // Trigger download via anchor element
+      // Fetch file with authentication header
+      final response = await http.get(
+        Uri.parse(fullUrl),
+        headers: {'Authorization': 'Bearer $token'},
+      );
+
+      if (response.statusCode != 200) {
+        throw Exception('Failed to download: ${response.statusCode}');
+      }
+
+      // Create blob and trigger download
+      final bytes = response.bodyBytes;
+      final blob = web.Blob(
+        [bytes.toJS].toJS,
+        web.BlobPropertyBag(type: response.headers['content-type'] ?? 'application/octet-stream'),
+      );
+      final blobUrl = web.URL.createObjectURL(blob);
+
+      // Create anchor and trigger download
       final anchor = web.HTMLAnchorElement()
-        ..href = fullUrl
+        ..href = blobUrl
-        ..download = file.name;
+        ..download = file.name
+        ..style.display = 'none';
+      web.document.body?.appendChild(anchor);
       anchor.click();
       
+      // Cleanup
+      web.document.body?.removeChild(anchor);
+      web.URL.revokeObjectURL(blobUrl);
+
       // Dismiss preparing snackbar and show success
       snackController?.close();
       if (context.mounted) {