In the XLSX signatory block, place the approver signature centred over the
name and tuck the stamp to its right with a slight overlap. The stamp is now
drawn before the signature so it layers behind it (Excel z-order = add order).
Images are positioned by absolute pixels via native EMU offsets — ExcelJS's
fractional-column anchors don't map cleanly to pixels (the stamp was landing
on top of the signature centre instead of to its right). Verified in a real
export: signature centre 252px in the 503px A-D block (centred), stamp to the
right (305-372px), stamp drawn behind the signature.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
The logo, signature, stamp and cancelled watermark were placed with ExcelJS
two-cell (tl/br) anchors, which stretch each image to fill a cell range —
distorting them and making the watermark text small/squished. The PDF looked
fine because CSS sizes by aspect.
- New lib/image-size.ts: getImageSize (PNG/JPEG/WebP header parse) + scaleToBox.
- Export route now places each image with a oneCell `tl` + pixel `ext`,
aspect preserved and matched to the PDF sizes (logo ≤96×52, signature ≤165×44,
stamp ≤80×66, watermark ≤880×720).
- Watermark regenerated as a landscape canvas with the text filling it, so it
spans the page like the PDF instead of sitting small in the centre.
- Unit test for getImageSize + scaleToBox.
Verified structurally: generated XLSX uses oneCellAnchors with fixed pixel
ext sizes (49×52 / 45×44 / 67×66 / 880×629), not stretched cell ranges.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
