Normalize folder names to prevent leading/trailing slashes in folder creation

b0esche_cloud/lib/pages/file_explorer.dart

@@ -130,10 +130,13 @@ class _FileExplorerState extends State<FileExplorer> {
                         onPressed: () {
                           final folderName = controller.text.trim();
                           if (folderName.isNotEmpty) {
-                            final nameWithSlash = folderName.startsWith('/')
+                            // Strip any leading/trailing slashes so we only send the bare folder name
-                                ? folderName
+                            final sanitized = folderName
-                                : '/$folderName';
+                                .replaceAll(RegExp(r'^/+'), '')
-                            Navigator.of(context).pop(nameWithSlash);
+                                .replaceAll(RegExp(r'/+$'), '');
+                            if (sanitized.isNotEmpty) {
+                              Navigator.of(context).pop(sanitized);
+                            }
                           }
                         },
                         child: const Text(

b0esche_cloud/lib/services/file_service.dart

@@ -119,20 +119,28 @@ class FileService {
     String parentPath,
     String folderName,
   ) async {
+    // Normalize folder name to avoid accidental leading slashes creating double-slash paths
+    final normalizedName = folderName
+        .replaceAll(RegExp(r'^/+'), '')
+        .replaceAll(RegExp(r'/+$'), '');
+    if (normalizedName.isEmpty) {
+      throw Exception('Folder name cannot be empty');
+    }
+
     // Construct proper path: /parent/folder or /folder for root
     String path;
     if (parentPath == '/') {
-      path = '/$folderName';
+      path = '/$normalizedName';
     } else {
       // Ensure parentPath doesn't end with / before appending
       final cleanParent = parentPath.endsWith('/')
           ? parentPath.substring(0, parentPath.length - 1)
           : parentPath;
-      path = '$cleanParent/$folderName';
+      path = '$cleanParent/$normalizedName';
     }
 
     final data = {
-      'name': folderName,
+      'name': normalizedName,
       'path': path,
       'type': 'folder',
       'size': 0,