Move VACE Settings to full-width section below splitter columns

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

tab_batch_ng.py

@@ -445,7 +445,7 @@ def _render_sequence_card(i, seq, batch_list, data, file_path, state,
                                 ui.image(str(img_path)).classes('w-full')
                             ui.button(icon='visibility', on_click=dlg.open).props('flat dense')
 
-                # VACE Settings
+        # --- VACE Settings (full width) ---
         with ui.expansion('VACE Settings', icon='settings').classes('w-full'):
             _render_vace_settings(i, seq, batch_list, data, file_path, refresh_list)