feat: add project_path output to ProjectSource node

ProjectSource now outputs a third value: the project's folder path,
fetched from the new /api/projects/{name} endpoint. Useful for
building paths to files relative to the project directory.

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

api_routes.py

@@ -28,6 +28,7 @@ def register_api_routes(db: ProjectDB) -> None:
 
     app.add_api_route("/api/projects", _list_projects, methods=["GET"])
     app.add_api_route("/api/active-project", _get_active_project, methods=["GET"])
+    app.add_api_route("/api/projects/{name}", _get_project, methods=["GET"])
     app.add_api_route("/api/projects/{name}/files", _list_files, methods=["GET"])
     app.add_api_route("/api/projects/{name}/files/{file_name}/sequences", _list_sequences, methods=["GET"])
     app.add_api_route("/api/projects/{name}/files/{file_name}/data", _get_data, methods=["GET"])
@@ -52,6 +53,15 @@ def _get_active_project() -> dict[str, Any]:
     return {"project": config.get("current_project", "")}
 
 
+def _get_project(name: str) -> dict[str, Any]:
+    db = _get_db()
+    proj = db.get_project(name)
+    if not proj:
+        raise HTTPException(status_code=404, detail=f"Project '{name}' not found")
+    return {"name": proj["name"], "folder_path": proj["folder_path"],
+            "description": proj.get("description", "")}
+
+
 def _list_files(name: str) -> dict[str, Any]:
     db = _get_db()
     files = db.list_project_files(name)

project_loader.py

@@ -67,6 +67,13 @@ def _fetch_json(url: str) -> dict:
         return {"error": "parse_error", "message": str(e)}
 
 
+def _fetch_project(manager_url: str, project: str) -> dict:
+    """Fetch project details (including folder_path) from the NiceGUI REST API."""
+    p = urllib.parse.quote(project, safe='')
+    url = f"{manager_url.rstrip('/')}/api/projects/{p}"
+    return _fetch_json(url)
+
+
 def _fetch_data(manager_url: str, project: str, file: str, seq: int) -> dict:
     """Fetch sequence data from the NiceGUI REST API."""
     p = urllib.parse.quote(project, safe='')
@@ -221,14 +228,16 @@ class ProjectSource:
             },
         }
 
-    RETURN_TYPES = ("INT", "STRING",)
+    RETURN_TYPES = ("INT", "STRING", "STRING")
-    RETURN_NAMES = ("sequence_number", "file_name",)
+    RETURN_NAMES = ("sequence_number", "file_name", "project_path")
     FUNCTION = "hold_config"
     CATEGORY = "JSON Manager/project"
     OUTPUT_NODE = True
 
     def hold_config(self, manager_url, project_name, file_name, sequence_number, label):
-        return (sequence_number, file_name,)
+        proj = _fetch_project(manager_url, project_name)
+        folder_path = proj.get("folder_path", "") if "error" not in proj else ""
+        return (sequence_number, file_name, folder_path)
 
 
 class ProjectKey: