Function useSelection

Default implementation of the getSelection / setSelection adapter contract every action hook (delete, duplicate, nudge, group, ...) requires.

Owns selection state, exposes a click-policy helper (single vs multi with an extend key), and pre-builds the two adapter methods consumers otherwise hand-roll in every demo:

const selection = useSelection({ mode: 'multi' });
const adapter = { ...arrayAdapter({...}), ...selection.adapterMethods };
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