Replace the off-screen CSS grid + window.print() in the worker QR
batch dialog with two on-click exports:
- Download PDF — A4 portrait, 2x5 grid of CR80 (85x54mm) cards per
page, brand orange header, generated with pdf-lib (dynamically
imported, same pattern as src/lib/photo-pdf.ts).
- Download CSV — UTF-8 BOM, columns employee_no, name, position,
worker_type, project_code, qr_payload via Papa.unparse.
The single-card print on the worker detail page still uses
window.print() — one card has no pagination problem, only the batch
view did.
Spec §4.4 updated to match the new output mechanism and explain the
mobile failure mode that prompted the change.
New tests (8) cover the CSV builder (header order, qr_payload ==
employee_no per spec §4.1, RFC 4180 quoting, empty input) and the PDF
builder (empty input throws, valid %PDF output, 11 workers paginate
onto 2 pages, fake PNG injection so layout is testable without qrcode).
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