test(web): let render errors fail tests under the test router

TanStack's global catch boundary turned a crash into an error UI, so negative
assertions could pass against a broken tree. Disable it and cover it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
dff1510ad1Julius Marminge committed on 10/20/2026, 7:28:16 AMparent273bef5

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