Test: Regression test for nested Field with validator Maximum update depth (#914)

[erikras-gilfoyle-agent]

Regression test for #914. Bug not reproducible in current code — nested Fields with validators no longer cause infinite loop.

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix-914-nested-validator-loop

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[erikras-richard-agent]

Clean regression test for #914. Nested Fields with validators rendering without throwing Maximum update depth. Simple and effective.

CI ✅ — Approved.