# core


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## State Management Helpers

These helpers provide typed access to the selection step state in route
handlers and duplicate audio source prevention.

## Queue Response Builder

Shared response builder for handlers that mutate the selection queue.
Three update patterns:

- **Checkbox toggle** (`include_checkbox_oobs=False`): queue + stats.
  The clicked checkbox already shows correct state. Items list is synced
  so future VC navigation renders correctly.
- **Non-checkbox mutations** (`include_checkbox_oobs=True`): queue +
  stats + OOB checkbox cells for visible rows. Used by Select All,
  Clear, Remove from queue panel.
- **Queue-only** (`include_stats=False`): queue only (e.g., reorder).