valknar 42b31bb661 fix(cover): flatten transparencies by targeting PDF 1.3 compatibility ...

PDF 1.4 preserves transparency objects, which KDP's preflight rejects.
Downgrading to 1.3 forces Ghostscript to composite all rgba overlays,
gradient alphas and image opacities into solid pixels during the write.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

2026-05-12 21:49:38 +02:00

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