Make sure catalog items do not trigger overflow error.

_↴ Ported from [flutter/genui#747](https://github.com/flutter/genui/issues/747) — originally opened by [polina-c](https://github.com/polina-c) on 2026-02-21._
_Original labels: P2, front-line-handled, a: api-simplicity_

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Catalog items should detect allowed space.

If it is unlimited, take minimal
If it is limited and too small, add scroll
If it is limited and too large, either expand or take right alignment from context

Look for catalog item components in the codebase, likely under a 'catalog' or 'ui' directory. Examine how space detection and overflow handling are currently implemented. The fix involves checking available space, adjusting sizing, and adding scroll or alignment based on context. Test by rendering catalog items in constrained containers to verify the new behavior matches the described logic.

索引モデルが issue の本文から書いたものです。