Wraps formatDocumentDate with the accessible presentation layer: a non-color
UNKNOWN cue (decorative calendar-with-question icon, aria-hidden, since the
visible "Datum unbekannt" text is the textual cue — WCAG 1.4.1), and the
verbatim meta_date_raw shown as a VISIBLE secondary "Originaltext: …" line for
UNKNOWN/SEASON/APPROX (WCAG 1.4.13, not tooltip-only). raw is rendered via
Svelte default escaping, never {@html} (CWE-79); a component test asserts an
angle-bracket raw value stays inert. Browser test is CI-only.
Refs #666
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
