ReportDetailPanel transitively calls useReportPreview, which fires fetch()
from api.ts. jsdom has no fetch, the promise rejects, and the catch handler's
setError triggers a React update after the test environment is torn down —
React then accesses window and the suite fails with ReferenceError. The
engine failures previously masked this by failing the shard before the
teardown race could surface. Mocking the api module makes the preview
resolve synchronously and keeps the suite clean.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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