fix(cover): flatten transparencies by targeting PDF 1.3 compatibility

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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>

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valknarandClaude Sonnet 4.6 committed 2026-05-12 21:49:38 +02:00

1 parent 35c76656e9

commit 42b31bb661

2 files changed

+1 -1

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

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