- Shift+click to toggle node selection (multi-select mode)
- BatchActionBar floating at bottom when >1 node selected
- Batch Restart All, Pause All, Delete All with ConfirmDialog
- Selected nodes get blue ring highlight
- Escape clears selection
- Pane click clears selection
- Dark theme, accessible (ARIA labels, focus rings)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>