The undated bucket is assembled from all entries, so it can contain
events as well as letters. Rendering every undated entry with LetterCard
produced a dead /documents/undefined link and "Unknown -> Unknown" for
events. Dispatch on kind/type like YearBand does (WorldBand/EventPill/
LetterCard).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Renders year bands in DTO order with interior empty-year runs folded into one
GapSpan (REQ-015), a single <ol> in chronological DOM order (REQ-006), the undated
bucket via {#if} (REQ-016), and a calm empty state (REQ-017). personId is a
declared seam (issue #10), undefined here, never passed to leaf cards (REQ-025).
Centered desktop spine / left phone spine via scoped CSS. Owns no <main>.
Refs #779
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
