Node 22 URL.createObjectURL strictly requires a native node:buffer Blob
and throws ERR_INVALID_ARG_TYPE when given a jsdom Blob (caught by
fetchImageAsBlob, returning ''). Node 24 relaxed this check, masking the
failure locally.
Tests 007, 011: replace MSW/Response-based fetch mocks with direct
vi.spyOn(fetch) mocks returning node:buffer Blobs via a duck-typed
response object. The real URL.createObjectURL now handles the correct
Blob type and returns a genuine blob: URL on all Node versions.
Test 012: URL.createObjectURL identity varies across Node versions
making it impossible to spy on reliably. Replace createObjectURLSpy
assertion with a completedFetches counter in the fetch mock, which
proves the same semantic guarantee (6 requests ran, 7th was cleared).
setup.ts: restore the original conditional guard so the vi.fn fallback
only applies when URL.createObjectURL is completely absent, not
overwriting a working real implementation.
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