Five client-side export paths per design §7 (faraday-Q4: rule out
chromedp, browser-print is good enough).
- SVG: XMLSerializer over a clone of the live SVGSVGElement, with
--chart-* tokens inlined so the standalone file paints the same way
when opened in an image viewer (no document.css context).
- PNG: SVG → Image → Canvas at 2× DPR, toBlob("image/png"). White
background painted first so transparent SVG stays printable.
- PDF: window.print() → @media print stylesheet hides chrome, forces
the print palette tokens, locks A4 landscape via @page. User picks
"Save as PDF" in the browser print dialog. No chromedp dep.
- CSV: 20-column flat schema mirroring TimelineEvent, UTF-8 BOM for
Excel-DE, RFC 4180 escaping.
- JSON: events + lanes envelope + export-metadata header (project_id,
project_title, exported_at).
Export menu uses native <details>/<summary> so it's keyboard-accessible
without JS. The chart handle exposes getSVGElement() + getData() so
chart-export.ts stays pure: it never reads DOM state outside the SVG
it's handed.
Filenames are sanitised + dated: paliad-{title}-{yyyy-mm-dd}.{ext}.
i18n: 7 new keys DE+EN under projects.chart.export.*.
Design ref: docs/design-project-chart-2026-05-09.md §7.
