DocumentRow rendered a bare em-dash for null-dated letters — a glyph a
screen reader announces as nothing. Both breakpoints now render the single
DocumentDate component unconditionally (no {#if}/—/{:else}), so the cue
cannot drift; its unknown state is a neutral metadata chip ("Datum
unbekannt", text-ink-3, ≥4.5:1 both themes) with a non-color calendar glyph,
never red/amber. Present dates render at honest precision via
formatDocumentDate ("Juni 1916", not a fabricated day).
Refs #668
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>
