Refactor file download logic to improve authentication handling and code readability

b0esche_cloud/lib/pages/file_explorer.dart

@@ -336,7 +336,8 @@ class _FileExplorerState extends State<FileExplorer> {
       );
 
       // Build full URL with token for authentication (anchor elements can't send headers)
-      final fullUrl = '${fileService.baseUrl}$downloadUrl&token=${Uri.encodeComponent(token)}';
+      final fullUrl =
+          '${fileService.baseUrl}$downloadUrl&token=${Uri.encodeComponent(token)}';
 
       // Trigger download via anchor element
       final anchor = web.HTMLAnchorElement()
@@ -351,7 +352,11 @@ class _FileExplorerState extends State<FileExplorer> {
           SnackBar(
             content: Row(
               children: [
-                const Icon(Icons.download_done, color: AppTheme.accentColor, size: 20),
+                const Icon(
+                  Icons.download_done,
+                  color: AppTheme.accentColor,
+                  size: 20,
+                ),
                 const SizedBox(width: 12),
                 Expanded(
                   child: Text(