Fix dropdown initialization in Enhanced Dataset Mode

- Use gr.update() instead of gr.Dropdown() in initialize_interface()
- Properly updates dropdown choices and value on interface load
- Resolves empty 'Available Datasets' dropdown issue
- Datasets should now appear correctly in the dropdown menu

src/interface/enhanced_verification_ui.py

@@ -533,9 +533,9 @@ class EnhancedVerificationUIComponents:
                     first_info, first_dataset = controller.get_dataset_info(dataset_choices[0])
                     dataset_info = first_info
                 
-                # Return gr.Dropdown with choices to properly update the component
+                # Use gr.update() to properly update the dropdown
                 return (
-                    gr.Dropdown(choices=dataset_choices, value=dataset_choices[0] if dataset_choices else None),  # dataset_selector
+                    gr.update(choices=dataset_choices, value=dataset_choices[0] if dataset_choices else None),  # dataset_selector
                     dataset_info,     # dataset_info_display
                     first_dataset,    # current_dataset_state
                     status_msg        # status_message