The registry-driven selectable branch in `collectNodeIdsInBounds` called
`objectBoundsIntersectsBounds(node.id, bounds)` directly, but `bounds` is
`Bounds | null` (null = select-all / no rectangle). Every other branch
guards with `!bounds ||`; this one didn't, so `tsc --build` failed in
consumers (`@pascal-app/nodes`) with TS2345 "Bounds | null not assignable
to Bounds". Add the same guard, which also restores correct select-all
behavior for registry-selectable kinds.
Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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