A HISTORICAL band's subtitle now carries the visible "historisch" register
inline as plain text: "{date} · historisch", or — for a RANGE — after the
existing 1914–1918 span pill (whose Zeitraum aria-label is unchanged). The
descriptor is a text node, never a second pill. Every WorldBand is
historical, so the suffix also trails an undated band on its own.
Refs #833
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Full-width muted band; RANGE renders a span pill (1914–1918) with a Zeitraum
aria-label (REQ-009); a RANGE with no end degrades to the start year, no pill,
no crash (REQ-010). World glyph is a redundant non-color cue with sr-only label
(REQ-018); text uses text-ink-2 to hold AA in both themes (REQ-019).
Refs #779
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
