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- Use pageInfo.width/height (authoritative rendered canvas size from react-pdf) instead of containerRect.width/height for all coordinate math; containerRect dimensions could differ if the wrapper div has extra decoration not matching the canvas - Track containerSize in state (updated via useLayoutEffect when pageInfo changes) so renderFields() uses stable values from state instead of calling getBoundingClientRect() during render - Refactor screenToPdfCoords/pdfToScreenCoords to take renderedW/H as explicit params instead of a DOMRect, making the contract clearer Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>