Fix dataset dropdown initialization and auto-select first dataset

- Fix initialize_interface to return gr.Dropdown with choices
- Auto-select first dataset on interface load
- Add current_dataset_state to outputs for proper state management
- Resolves 'No dataset selected' error when clicking Load Dataset

src/interface/enhanced_verification_ui.py

@@ -527,9 +527,17 @@ class EnhancedVerificationUIComponents:
                 """Initialize the interface with datasets and templates."""
                 dataset_choices, dataset_info, status_msg, templates = controller.initialize_interface()
                 
+                # Get first dataset info if available
+                first_dataset = None
+                if dataset_choices:
+                    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
                 return (
-                    dataset_choices,  # dataset_selector choices
+                    gr.Dropdown(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
                 )
             
@@ -761,6 +769,7 @@ class EnhancedVerificationUIComponents:
                 outputs=[
                     dataset_selector,
                     dataset_info_display,
+                    current_dataset_state,
                     status_message
                 ]
             )