Exercises the chromium/snappdf pipeline via POST /api/v1/preview with
no entity, which falls back to PdfMock's self-contained mock PDF -
verified this needs no client/invoice test data, since a fresh account
has neither. Asserts the response starts with the %PDF magic bytes.
This was previously the biggest untested path in the module: an actual
binary runtime dependency (chromium) rather than just config, and the
kind of thing that silently breaks in a minimal NixOS closure.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
awkawbandClaude Sonnet 5
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