Interface AreaSelectAdapter

Narrow adapter for useAreaSelect. Transient: no checkpoint, no history. The hook calls applyOps(ops) instead of applyOps(ops, label).

All fields are optional — area-select is opt-in. useSelectTool only wires the default marquee behavior when hitTestArea, getSelection, setSelection, and applyOps are all present on the adapter; otherwise the gesture short-circuits (empty-space drags do nothing, sub-threshold empty clicks still clear selection via the tool's onClick path). Demos that don't need marquee selection can omit these methods entirely.