fix: fetch active project in hold_config when project_name is empty

Hidden widgets aren't serialized by ComfyUI on queue, so project_name
arrives empty. Fall back to /api/active-project directly from Python.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

project_loader.py

@@ -235,7 +235,13 @@ class ProjectSource:
     OUTPUT_NODE = True
 
     def hold_config(self, manager_url, project_name, file_name, sequence_number, label):
-        proj = _fetch_project(manager_url, project_name)
+        name = project_name.strip()
+        if not name:
+            active = _fetch_json(f"{manager_url.rstrip('/')}/api/active-project")
+            name = active.get("project", "") if "error" not in active else ""
+        folder_path = ""
+        if name:
+            proj = _fetch_project(manager_url, name)
             folder_path = proj.get("folder_path", "") if "error" not in proj else ""
             if folder_path and not folder_path.endswith("/"):
                 folder_path += "/"