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fix(timeline): interleave cross-year cards at their earliest letter

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Cross-year clusters were appended after every event and loose letter, so a
band with a loose November letter plus February letters linked to another
year's event rendered the February ✉ card BELOW the November letter —
earlier-dated content sitting visually below later-dated content, breaking
the strict-time reading the band guarantees.

A cross-year cluster (no same-year EVENT anchor in this band) now emits its
card at the position of its earliest linked letter, in the band's
chronological order. Closes the spec gap pinned as REQ-015. Fixes review
finding #1.

Refs #850
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Marcel
2026-06-15 22:31:03 +02:00
committed by marcel
parent 9a8b4ff6d0
commit 213fea3c74
3 changed files with 51 additions and 16 deletions
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@@ -208,4 +208,4 @@
| REQ-012 | show-more/less labels are new Paraglide keys in de/en/es; unused #827 grouping/Thema keys removed | #850 | inline-event-clustering | `frontend/messages/{de,en,es}.json`, `frontend/src/lib/timeline/EventCluster.svelte` | `messages.spec.ts#zeitstrahl visual-fidelity keys are present in all locales` (now asserts `timeline_bucket_show_more`/`_less`; `timeline_grouping_date` removed) | Done |
| REQ-013 | `GET /api/timeline` failure → existing localized error state via `getErrorMessage(code)` (unchanged #779) | #850 | inline-event-clustering | `frontend/src/routes/zeitstrahl/+page.svelte` (unchanged error path) | covered by #779 `zeitstrahl` error-state tests (regression — no change) | Done |
| REQ-014 | HISTORICAL curated event with ≥1 linked letter keeps its full-width WorldBand — never clusters into a card (preserves #779 REQ-009); its letters stay loose | #850 | inline-event-clustering | `frontend/src/lib/timeline/eventClustering.ts` (`buildEventLookup` excludes HISTORICAL) | `eventClustering.spec.ts#excludes a HISTORICAL event so its letters stay loose, keeping its WorldBand (REQ-014)`; `TimelineView.svelte.spec.ts#keeps a HISTORICAL event a WorldBand with a same-year linked letter — never clusters (REQ-014)` | Done |
| REQ-015 | a cross-year ✉ card is placed at its earliest linked letter's chronological position in the band — never appended after later-dated loose letters | #850 | inline-event-clustering | `frontend/src/lib/timeline/YearBand.svelte` | `YearBand.svelte.spec.ts#interleaves a cross-year card before a later-dated loose letter in the same band` | Planned |
| REQ-015 | a cross-year ✉ card is placed at its earliest linked letter's chronological position in the band — never appended after later-dated loose letters | #850 | inline-event-clustering | `frontend/src/lib/timeline/YearBand.svelte` | `YearBand.svelte.spec.ts#interleaves a cross-year card before a later-dated loose letter in the same band (REQ-015)` | Done |