new: hide hidden nodes

lib/features/proxy/data/proxy_repository.dart

@@ -42,6 +42,7 @@ class ProxyRepositoryImpl
                       selectedTag: groupWithSelected[e.tag],
                     ),
                   )
+                  .filter((t) => t.isVisible)
                   .toList(),
             ),
           )

lib/features/proxy/model/proxy_entity.dart

@@ -31,6 +31,7 @@ class ProxyItemEntity with _$ProxyItemEntity {
   String get name => _sanitizedTag(tag);
   String? get selectedName =>
       selectedTag == null ? null : _sanitizedTag(selectedTag!);
+  bool get isVisible => !tag.contains("§hide§");
 }
 
 String _sanitizedTag(String tag) =>