Update dense_file_manager.py

Enhanced the JSON validation error dialogs for dense description file managers by appending modality-specific Hugging Face download links to guide users to the correct dataset formats.

Author: woshimajintao

annotation_tool/controllers/dense_description/dense_file_manager.py

@@ -72,10 +72,18 @@ def load_project(self, data, file_path):
                 if len(error_msg) > 1000:
                     error_msg = error_msg[:1000] + "\n... (truncated)"
 
+                error_text = (
+                    "The imported JSON contains critical errors and cannot be loaded.\n\n"
+                    f"{error_msg}\n\n"
+                    "--------------------------------------------------\n"
+                    "💡 Please download the correct Dense Description JSON format from:\n"
+                    "https://huggingface.co/datasets/OpenSportsLab/soccernetpro-densedescription-sndvc"
+                )
+                
                 QMessageBox.critical(
                     self.main,
                     "Validation Error (Dense Description)",
-                    "The imported JSON contains critical errors and cannot be loaded.\n\n" + error_msg,
+                    error_text,
                 )
                 return False