Closes#850
## Summary
On `/zeitstrahl`, a curated event that has letters linked to it now renders as a contained event card — the event is the card header (accent glyph, title, `{date} · {kuratiert|abgeleitet}` subtitle, count, and a curator edit link), with its linked letters listed inside (first 5, then a keyboard-operable show-more/less toggle). Letters in a year *other* than the event's band get a lighter cross-year `✉ title` card. Every other letter stays a plain, alternating, density-folding chronological letter. There is **no grouping control** — clustering is automatic and always on. The meta-line drops its `Gruppierung: Datum` segment.
This supersedes #827: it keeps that branch's event-card clustering and the computed `linkedEventId`, and drops the toggle, the Thema mode, and the "Weitere Briefe" drawer.
## What changed
**Backend**
- `TimelineEntryDTO` gains a nullable `linkedEventId` (UUID; not `@Schema(REQUIRED)`).
- `TimelineService.resolveLetterEventLinks` resolves each letter's curated event in one batched pass over the events it already loads — no per-letter query, no new column, no Flyway migration.
- Regenerated the single `linkedEventId?` field in `api.ts`.
**Frontend**
- New `eventClustering.ts` (`buildEventLookup`, `splitYearLetters`, `CLUSTER_PREVIEW=5`) — filter-then-cluster: a letter clusters only if its `linkedEventId` is set AND present in the lookup, otherwise it stays loose.
- New `EventCluster.svelte` — the contained event card (same-year event header + edit link, or cross-year ✉ text header; first-5 + show-more).
- `LetterCard.svelte` gains `compact` + `variant='event'` (the `.lcard.ev` in-card letter).
- `YearBand.svelte` rebuilt to render event clusters inline; loose letters keep the alternating layout and density strip, and the strip counts **only** loose letters (no duplication).
- `TimelineView.svelte` builds the event lookup once and threads it + `canWrite` to each band.
- `+page.svelte` drops the grouping meta segment; the unused `timeline_grouping_date` key removed from de/en/es.
- New `timeline_bucket_show_more`/`_less` keys in all locales.
- REQ-010 `{@html}` grep gate over `lib/timeline/`.
## Tests (real runs)
- Backend `TimelineServiceTest`: **30 passed** (incl. the 2 new `linkedEventId` tests); `DerivedEventsAssemblyTest`: 17 passed; backend main sources compile.
- Frontend client sweep (`LetterCard`, `EventCluster`, `YearBand`, `TimelineView`, `zeitstrahl/page`): **81 passed** (5 files).
- Frontend server sweep (`eventClustering`, `messages`, `timeline-no-raw-html`): **18 passed** (3 files).
- `svelte-check`: no new errors in the touched files (pre-existing baseline noise elsewhere unchanged).
RTM: thirteen `REQ-001..013` rows added for #850 (feature `inline-event-clustering`), Status Done.
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Co-authored-by: Marcel <marcel@familienarchiv>
Reviewed-on: #851
Add REQ-001..011 rows for the timeline-curator-affordances feature (all
Done) and a messages.spec parity guard pinning timeline_add_event +
person_add_event across de/en/es. REQ-010/011 cite the existing #781
new-event route + its 403 guard test (no new production code).
Refs #842
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Eight Paraglide keys for the /zeitstrahl layer filter — layer labels, the
fieldset legend, the sticky trigger (distinct timeline_filter_trigger and
timeline_filter_trigger_active({count}) so it never reads "Filter (0 aktiv)"),
the reset button, and the filtered-empty message — added to all three locales.
messages.spec asserts their presence and the {count} signature.
Refs #780
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
timeline_tag_chip_label (de "Thema" / en "Topic" / es "Tema") is the sr-only
prefix the /zeitstrahl letter tag chip reads out so color is never the only
cue. Pinned per locale in messages.spec.ts; the tag name itself is rendered as
data, never translated.
Refs #835
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
A count of one rendered "1 Briefe" / "1 Ereignisse". Add _singular
companion keys (de/en/es) and select them when the count is exactly one,
following the project's _singular/_plural convention.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Seven new timeline_* keys feeding the upcoming chrome: the header meta
line (grouping label + events count), the event-pill provenance token,
the ✉ sr-only label, the world-band "historisch" suffix, and the strip
density caption — present in de/en/es with matching key sets, pinned by a
new parity test.
Refs #833
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
REQ-024 was updated (issue #779) to require localized sr-only/aria
labels instead of German-only. Pin the de/en/es values so they cannot
silently drift back to the German source strings.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Adds 7 Paraglide keys (viewer_previous_page, viewer_next_page,
viewer_zoom_out, viewer_zoom_in, transcribe_mark_for_training,
layout_menu_open, layout_menu_close) to de/en/es.json.
Adds messages.spec.ts to enforce key parity across all three locales.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
