feat(core/hooks): add 'useSelection' hook

[sukvvon]

Overview

Add useSelection hook that manages multi-selection state over a list of items. Provides select, deselect, toggle, selectAll, deselectAll, toggleAll, isSelected, isAllSelected, and isSomeSelected.

• Internal Set<T> for O(1) lookup
• Values not in items are ignored by select/toggle
• Auto-syncs selection when items changes (removes stale selections)
• Stable action references via usePreservedCallback

Checklist

• Did you write the test code?
• Have you run yarn run fix to format and lint the code and docs?
• Have you run yarn run test:coverage to make sure there is no uncovered line?
• Did you write the JSDoc?

[kimyouknow]

Thank you for this comprehensive implementation!

After discussion with @zztnrudzz13 , we've decided useSelection falls outside the library's scope. The selection logic (selectAll, toggleAll, isAllSelected, etc.) reflects a specific domain pattern built on top of useSet (which we're accepting as a primitive).

Our goal is to provide primitives that users compose freely — domain-level abstractions like selection management embed assumptions that may not fit every use case.

Same rationale as #338, #233 — see those PRs for context.

If you see it differently or have thoughts on this, we'd love to hear them. We appreciate the effort!