fix(react): run registry actions without a state setter

[Yi-111-a]

Fixes #354

Summary

• execute catalog actions even when getSetState() returns undefined
• pass a no-op state setter so actions that update state remain safe
• add regression coverage for the stateless handler path

Verification

• focused React renderer tests: 9 passed
• source-only TypeScript check: passed
• Prettier check: passed
• full pnpm lint and pnpm type-check could not run in this VM because the repository requires Node 24+ and the full dependency install exhausted the available disk

AI disclosure: I used OpenCode (opencode/space-bunny-free) to inspect, implement, and verify this change.

[vercel]

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