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The app sets canvas.height = Math.ceil(viewport.height) per page and stacks pages by those heights; the backend page_top used the raw float, so it fell ~1px/page short, compounding to a visible upward shape shift on later pages (~36px over 40 pages). Ceil rendered_h to match exactly. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>