fix(cover): round page count to even before computing spine width

Amazon rounds odd page counts up to the next even number before
calculating spine thickness. 99 pages → 100 effective pages gives
0.2347 in (5.96 mm) instead of 0.2324 in (5.90 mm).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
2026-05-13 09:25:58 +02:00
parent 42b31bb661
commit 0e2ad13aaf
2 changed files with 3 additions and 2 deletions
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