refactor(frontend): share DateInputWithPrecision between life-date and relationship fields

PersonLifeDateField and RelationshipDateField were the same DateInput + restricted
precision <select>: identical onMount seeding (incl. the YEAR fallback for stored
non-offered precisions), the setCustomValidity partial-date guard, and markup.
Extract that into a domain-agnostic DateInputWithPrecision primitive (caller injects
the precisions, labels, hint, and styling deltas); both fields become thin wrappers
that keep their existing public props, so the person new/edit pages and the Stammbaum
call sites are unchanged. Named to stay distinct from the full DatePrecisionField
(documents/timeline, all seven precisions + RANGE). The relationship select drops its
redundant sr-only label, keeping the equivalent aria-label. PersonLifeDateField,
AddRelationshipForm and RelationshipChip specs (26) stay green.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

.gitea/workflows/nightly.yml

@@ -192,52 +192,17 @@ jobs:
           REPO="${{ github.repository }}"
           RUN_URL="${GITEA_URL}/${REPO}/actions/runs/${{ github.run_id }}"
 
-          # --- Gitea API helper ---
-          # api METHOD URL [extra curl args...] — authenticated Gitea API call.
-          # `curl -sf` collapses every HTTP >=400 into a bare "exit 22", which
-          # surfaces as an opaque step failure (issue #839). Instead we read the
-          # status code and, on a >=400 response, print an actionable ::error::
-          # to stderr (so a calling command substitution does not swallow it) and
-          # return 1 — `set -e` then still fails the step. The token is never
-          # echoed (no set -x; never placed in the message).
-          api() {
-            local method="$1" url="$2"; shift 2
-            local resp http
-            resp=$(curl -s -w '\n%{http_code}' -X "$method" \
-              -H "Authorization: token $NIGHTLY_AUDIT_TOKEN" "$@" -- "$url")
-            http=${resp##*$'\n'}
-            printf '%s' "${resp%$'\n'*}"
-            case "$http" in
-              2*|3*) return 0 ;;
-              401|403)
-                echo "::error::Gitea returned HTTP $http for $method ${url%%\?*} — the NIGHTLY_AUDIT_TOKEN secret is missing, expired, or lacks issue read+write scope; recreate the renovate_bot PAT and update the secret." >&2
-                return 1 ;;
-              *)
-                echo "::error::Gitea returned HTTP ${http:-(none)} for $method ${url%%\?*}." >&2
-                return 1 ;;
-            esac
-          }
-
           # --- Self-test (mirrors ci.yml §Assert pattern) ---
-          # Runs before any real API call so broken logic fails loudly early:
+          # Tests the exact jq test() call used in the dedupe step, before any
-          # (a) the jq title matcher used by the dedupe step — proves the regex
+          # API call, so a broken matcher fails loudly early rather than silently
-          #     only; the create-vs-update decision is exercised by the
+          # opening duplicate issues. Proves the regex only — create-vs-update
-          #     workflow_dispatch AC;
+          # decision is exercised by the workflow_dispatch AC.
-          # (b) the api helper's HTTP-status handling, driven by a mocked curl so
-          #     it needs no network — proves a 2xx returns the body and a >=400
-          #     fails with an ::error:: instead of an opaque exit 22.
           echo "{\"title\": \"${MARKER}\"}" \
             | jq -e --arg m "$MARKER" '.title | test($m; "i")' > /dev/null \
             || { echo "FAIL: self-test — jq test() missed tracking issue title"; exit 1; }
           echo '{"title": "fix(deps): update dependency esbuild (CVE-2025-12345)"}' \
             | jq -e --arg m "$MARKER" '.title | test($m; "i") | not' > /dev/null \
             || { echo "FAIL: self-test — jq test() incorrectly matched unrelated title"; exit 1; }
-          ( curl() { printf 'OK\n200'; }; [ "$(api GET selftest)" = "OK" ] ) \
-            || { echo "FAIL: self-test — api helper dropped body on HTTP 200"; exit 1; }
-          ( curl() { printf 'nope\n401'; }
-            if api GET selftest >/dev/null 2>/tmp/api_selftest_err; then exit 1; fi
-            grep -q '::error::' /tmp/api_selftest_err ) \
-            || { echo "FAIL: self-test — api helper did not emit ::error:: on HTTP 401"; exit 1; }
           echo "Self-test passed."
 
           # --- Run audit ---
@@ -272,7 +237,8 @@ jobs:
             # Renovate vuln PRs also carry the "security" label, so >1 open
             # "security" issue WILL occur. Title-match (not just label) ensures
             # we deduplicate only our own tracking issue.
-            OPEN_ISSUES=$(api GET \
+            OPEN_ISSUES=$(curl -sf \
+              -H "Authorization: token $NIGHTLY_AUDIT_TOKEN" \
               "${GITEA_URL}/api/v1/repos/${REPO}/issues?state=open&type=issues&labels=security&limit=50")
 
             MATCHED=$(echo "$OPEN_ISSUES" | jq \
@@ -289,10 +255,11 @@ jobs:
                 --arg run_url "$RUN_URL" \
                 '$existing + "\n\n---\n\nUpdated by run: " + $run_url')
               PAYLOAD=$(jq -n --arg body "$NEW_BODY" '{"body": $body}')
-              api PATCH \
+              curl -sf -X PATCH \
-                "${GITEA_URL}/api/v1/repos/${REPO}/issues/${ISSUE_NUMBER}" \
+                -H "Authorization: token $NIGHTLY_AUDIT_TOKEN" \
                 -H "Content-Type: application/json" \
-                -d "$PAYLOAD" > /dev/null
+                -d "$PAYLOAD" \
+                "${GITEA_URL}/api/v1/repos/${REPO}/issues/${ISSUE_NUMBER}" > /dev/null
               echo "Updated tracking issue #${ISSUE_NUMBER}"
             else
               # Closed prior issue that recurs → new issue (not reopened).
@@ -301,21 +268,24 @@ jobs:
                 --arg title "$MARKER" \
                 --arg body "$ISSUE_BODY" \
                 '{"title": $title, "body": $body}')
-              CREATED=$(api POST \
+              CREATED=$(curl -sf -X POST \
-                "${GITEA_URL}/api/v1/repos/${REPO}/issues" \
+                -H "Authorization: token $NIGHTLY_AUDIT_TOKEN" \
                 -H "Content-Type: application/json" \
-                -d "$PAYLOAD")
+                -d "$PAYLOAD" \
+                "${GITEA_URL}/api/v1/repos/${REPO}/issues")
               NEW_NUMBER=$(echo "$CREATED" | jq -r '.number')
               echo "Opened new tracking issue #${NEW_NUMBER}"
 
               # Labels are ignored on issue create in Gitea — add in a follow-up call.
-              LABEL_IDS=$(api GET \
+              LABEL_IDS=$(curl -sf \
+                -H "Authorization: token $NIGHTLY_AUDIT_TOKEN" \
                 "${GITEA_URL}/api/v1/repos/${REPO}/labels?limit=50" \
                 | jq '[.[] | select(.name == "security" or .name == "devops" or .name == "P1-high") | .id]')
-              api POST \
+              curl -sf -X POST \
-                "${GITEA_URL}/api/v1/repos/${REPO}/issues/${NEW_NUMBER}/labels" \
+                -H "Authorization: token $NIGHTLY_AUDIT_TOKEN" \
                 -H "Content-Type: application/json" \
-                -d "{\"labels\": $LABEL_IDS}" > /dev/null
+                -d "{\"labels\": $LABEL_IDS}" \
+                "${GITEA_URL}/api/v1/repos/${REPO}/issues/${NEW_NUMBER}/labels" > /dev/null
             fi
 
             exit "$AUDIT_EXIT"

.specify/rtm.md

@@ -173,39 +173,3 @@
 | REQ-012 | chip renders wherever a LetterCard renders (global timeline + expanded YearLetterStrip) | #835 | zeitstrahl-tag-chips | `frontend/src/lib/timeline/LetterCard.svelte` | `LetterCard.svelte.spec.ts#renders the chip inside an expanded YearLetterStrip too` | Done |
 | REQ-013 | sr-only theme label is a Paraglide key present in de/en/es | #835 | zeitstrahl-tag-chips | `frontend/messages/{de,en,es}.json` | `messages.spec.ts#zeitstrahl tag-chip label key is present in all locales` | Done |
 | REQ-014 | GET /api/timeline stays read-only (READ_ALL); no new endpoint/ErrorCode/IDOR; assembly logs UUIDs only | #835 | zeitstrahl-tag-chips | `timeline/TimelineController` (unchanged), `timeline/TimelineService` | `TimelineControllerTest#returns_200_with_read_all_permission`, `#returns_403_when_authenticated_without_read_all` (unchanged path); no tag names logged (review) | Done |
-| REQ-001 | TimelineFilters is presentation-only (3 $bindable layer booleans + onChange); no goto/url.searchParams/api.GET/fetch | #780 | timeline-layer-filter | `frontend/src/lib/timeline/TimelineFilters.svelte` | `TimelineFilters.svelte.spec.ts#renders the three layer toggles with accessible names`, `#reflects a layer as pressed and flips it, firing onChange`; `timelineFilterBoundary.spec.ts` | Done |
-| REQ-002 | route derives a client-side $derived filtered view, passes it to TimelineView; no goto/fetch on toggle | #780 | timeline-layer-filter | `frontend/src/routes/zeitstrahl/+page.svelte`, `frontend/src/lib/timeline/timelineFilter.ts#filterTimeline` | `page.svelte.spec.ts#hides letter cards when the Letters layer is off ... with no fetch`; `timelineFilterBoundary.spec.ts` | Done |
-| REQ-003 | Personal off → personal events (curated + derived life-events) hidden client-side | #780 | timeline-layer-filter | `frontend/src/lib/timeline/timelineFilter.ts#filterTimeline` | `timelineFilter.spec.ts#hides personal events — curated and derived`, `page.svelte.spec.ts#hides personal event cards` | Done |
-| REQ-004 | Historical off → historical event entries hidden client-side | #780 | timeline-layer-filter | `frontend/src/lib/timeline/timelineFilter.ts#filterTimeline` | `timelineFilter.spec.ts#hides HISTORICAL events`, `page.svelte.spec.ts#hides historical event cards` | Done |
-| REQ-005 | Letters off → letter entries hidden client-side | #780 | timeline-layer-filter | `frontend/src/lib/timeline/timelineFilter.ts#filterTimeline` | `timelineFilter.spec.ts#hides LETTER entries`, `page.svelte.spec.ts#hides letter cards` | Done |
-| REQ-006 | zero visible → filter empty-state + one-click reset below the open bar (never blank, never generic empty) | #780 | timeline-layer-filter | `frontend/src/routes/zeitstrahl/+page.svelte`, `frontend/src/lib/timeline/timelineFilter.ts#filterTimeline` | `page.svelte.spec.ts#shows the filtered-empty message + reset below the open bar`, `timelineFilter.spec.ts#drops year bands that become empty` | Done |
-| REQ-007 | sticky "Filter (N aktiv)" trigger; N from isDefaultState/hiddenLayerCount; 44px target | #780 | timeline-layer-filter | `frontend/src/lib/timeline/timelineFilter.ts`, `frontend/src/lib/timeline/TimelineFilters.svelte` | `timelineFilter.spec.ts#isDefaultState`, `#hiddenLayerCount`; `TimelineFilters.svelte.spec.ts#shows a plain trigger ... and a count`, `#gives the trigger a 44px touch target` | Done |
-| REQ-008 | reset text button restores all layers on; visibility tracks a $derived any-layer-off flag | #780 | timeline-layer-filter | `frontend/src/lib/timeline/TimelineFilters.svelte` | `TimelineFilters.svelte.spec.ts#hides the reset button by default and restores all layers when activated` | Done |
-| REQ-009 | prefers-reduced-motion → slide duration 0 (matchMedia guard reused from documents/[id]/+page.svelte:57) | #780 | timeline-layer-filter | `frontend/src/lib/timeline/TimelineFilters.svelte` | manual reduced-motion check + svelte-autofixer/code review (guard reused, only the slide `duration` zeroed) | Done |
-| REQ-010 | 8 timeline_filter_* keys in de/en/es; trigger vs trigger_active({count}) distinct | #780 | timeline-layer-filter | `frontend/messages/{de,en,es}.json` | `messages.spec.ts#zeitstrahl layer-filter keys are present in all locales (#780 REQ-010)` | Done |
-| REQ-001 | WRITE_ALL viewer → "Ereignis hinzufügen" link to /zeitstrahl/events/new in the wrapping Zeitstrahl header | #842 | timeline-curator-affordances | `frontend/src/routes/zeitstrahl/+page.svelte`, `frontend/messages/{de,en,es}.json` | `zeitstrahl/page.svelte.spec.ts#renders the add-event CTA in a wrapping header when the viewer can write` | Done |
-| REQ-002 | viewer without WRITE_ALL → no add-event affordance on /zeitstrahl | #842 | timeline-curator-affordances | `frontend/src/routes/zeitstrahl/+page.svelte` | `zeitstrahl/page.svelte.spec.ts#renders no add-event CTA when the viewer cannot write` | Done |
-| REQ-003 | WRITE_ALL viewer → person-page "Ereignis für diese Person" link to /zeitstrahl/events/new?personId={id} | #842 | timeline-curator-affordances | `frontend/src/routes/persons/[id]/PersonCard.svelte`, `frontend/messages/{de,en,es}.json` | `PersonCard.svelte.spec.ts#shows an add-event link pre-seeded with the person to a curator` | Done |
-| REQ-004 | viewer without WRITE_ALL → no add-event affordance on /persons/{id} | #842 | timeline-curator-affordances | `frontend/src/routes/persons/[id]/PersonCard.svelte` | `PersonCard.svelte.spec.ts#renders no add-event link to a reader` | Done |
-| REQ-005 | WRITE_ALL → EventPill edit link /zeitstrahl/events/{eventId}/edit for a curated PERSONAL event | #842 | timeline-curator-affordances | `frontend/src/lib/timeline/EventPill.svelte` | `EventPill.svelte.spec.ts#shows an edit affordance for a curated PERSONAL event when canWrite is true` | Done |
-| REQ-006 | WRITE_ALL → WorldBand edit link /zeitstrahl/events/{eventId}/edit for a curated HISTORICAL event (new inline ✎) | #842 | timeline-curator-affordances | `frontend/src/lib/timeline/WorldBand.svelte` | `WorldBand.svelte.spec.ts#shows an edit affordance for a curated HISTORICAL event when canWrite is true`, `#mirrors the EventPill pencil` | Done |
-| REQ-007 | viewer without WRITE_ALL → neither EventPill nor WorldBand renders an edit link | #842 | timeline-curator-affordances | `frontend/src/lib/timeline/EventPill.svelte`, `frontend/src/lib/timeline/WorldBand.svelte` | `EventPill.svelte.spec.ts#renders no edit affordance for a curated PERSONAL event when canWrite is false`, `WorldBand.svelte.spec.ts#renders no edit affordance for a curated HISTORICAL event when canWrite is false`, `TimelineView.svelte.spec.ts#renders no edit links in either path when canWrite is false` | Done |
-| REQ-008 | derived OR null eventId → no edit link regardless of permission (contract preserved) | #842 | timeline-curator-affordances | `frontend/src/lib/timeline/EventPill.svelte`, `frontend/src/lib/timeline/WorldBand.svelte` | `EventPill.svelte.spec.ts#shows no edit affordance when eventId is null even with canWrite`, `#shows no edit affordance for a derived event even with canWrite`, `WorldBand.svelte.spec.ts#shows no edit affordance when eventId is null even with canWrite` | Done |
-| REQ-009 | TimelineView threads canWrite through the year-band path and the undated bucket (identical gate) | #842 | timeline-curator-affordances | `frontend/src/lib/timeline/TimelineView.svelte`, `frontend/src/lib/timeline/YearBand.svelte` | `TimelineView.svelte.spec.ts#threads canWrite to a curated event in both a year band and the undated bucket`, `#threads canWrite to a curated HISTORICAL world band in both paths` | Done |
-| REQ-010 | person add-event opens #781 create form prefilled with the person, returns to /persons/{id} on save | #842 | timeline-curator-affordances | `frontend/src/routes/persons/[id]/PersonCard.svelte`, `frontend/src/routes/zeitstrahl/events/new/+page.server.ts` (#781) | `PersonCard.svelte.spec.ts#shows an add-event link pre-seeded with the person to a curator` (URL), `zeitstrahl/events/new/page.server.spec.ts#redirects to /persons/{id} when originPersonId is a valid UUID` (#781) | Done |
-| REQ-011 | non-curator direct nav to /zeitstrahl/events/new or /{id}/edit → 403 (existing #781 route guard, regression) | #842 | timeline-curator-affordances | `frontend/src/routes/zeitstrahl/events/new/+page.server.ts`, `frontend/src/routes/zeitstrahl/events/[id]/edit/+page.server.ts` (#781, unchanged — both share `requireWriteAll`) | `zeitstrahl/events/new/page.server.spec.ts#throws 403 for an authenticated user without WRITE_ALL`, `zeitstrahl/events/[id]/edit/page.server.spec.ts#throws 403 for a user without WRITE_ALL` | Done |
-| REQ-001 | `/zeitstrahl` renders a single chronological timeline with no grouping-mode control (no toggle/Thema/drawer) | #850 | inline-event-clustering | `frontend/src/routes/zeitstrahl/+page.svelte`, `frontend/src/lib/timeline/TimelineView.svelte` | `page.svelte.spec.ts#renders the meta sub-line with range and counts, no grouping segment`; absence of `GroupingControl`/`LetterBucket`/`BucketHeaderChip` (never ported) | Done |
-| REQ-002 | curated event with ≥1 same-year linked letter → contained card (event header + glyph/title/date·provenance/edit + compact letter cards) | #850 | inline-event-clustering | `frontend/src/lib/timeline/EventCluster.svelte`, `frontend/src/lib/timeline/YearBand.svelte`, `frontend/src/lib/timeline/eventClustering.ts` | `EventCluster.svelte.spec.ts#renders a data-testid event-card with the event title once`, `#shows the event-edit link for a curator`, `#renders its letters as compact a.lcard.ev cards`; `YearBand.svelte.spec.ts#renders a curated event with a same-year linked letter as one event-card, title once, no separate pill` | Done |
-| REQ-003 | event card body > 5 letters → first 5 + keyboard-operable show-more/less toggle (aria-expanded, ≥44px) | #850 | inline-event-clustering | `frontend/src/lib/timeline/EventCluster.svelte`, `frontend/src/lib/timeline/eventClustering.ts` (`CLUSTER_PREVIEW=5`) | `EventCluster.svelte.spec.ts#shows the first 5 of 8 letters + a show-more toggle that expands to 8 then back to 5`, `#renders no show-more toggle when the cluster holds 5 or fewer letters` | Done |
-| REQ-004 | linked letters in a year other than the event's band → labeled ✉ text-header card (no pill, no edit link) per such year | #850 | inline-event-clustering | `frontend/src/lib/timeline/EventCluster.svelte`, `frontend/src/lib/timeline/YearBand.svelte` | `EventCluster.svelte.spec.ts#renders a cross-year text header (✉ title, no event-edit, no pill) when no event is given`; `YearBand.svelte.spec.ts#renders a cross-year cluster (event not in this band) as a ✉ text-header card holding it` | Done |
-| REQ-005 | event/derived/world-band with no linked letters → existing plain pill/world-band (unchanged) | #850 | inline-event-clustering | `frontend/src/lib/timeline/YearBand.svelte`, `frontend/src/lib/timeline/EventPill.svelte`, `frontend/src/lib/timeline/WorldBand.svelte` | `YearBand.svelte.spec.ts#renders a curated event with NO linked letters as a plain EventPill, no card` | Done |
-| REQ-006 | letter linked to no curated event → loose chronological letter (alternating; density strip past 12) | #850 | inline-event-clustering | `frontend/src/lib/timeline/YearBand.svelte`, `frontend/src/lib/timeline/eventClustering.ts` | `eventClustering.spec.ts#keeps a letter with no linkedEventId loose`; `YearBand.svelte.spec.ts#renders loose (unlinked) letters in a sparse year as alternating .letter-row, no card` | Done |
-| REQ-007 | loose-letter layout + density strip count ONLY non-event-linked letters; clustered letter never also loose | #850 | inline-event-clustering | `frontend/src/lib/timeline/YearBand.svelte`, `frontend/src/lib/timeline/eventClustering.ts` | `eventClustering.spec.ts#places each letter in exactly one place`; `YearBand.svelte.spec.ts#counts only loose letters in the density strip; event letters stay in the card` | Done |
-| REQ-008 | letter whose only linking event is filtered out (absent from lookup) → loose, never re-introduces the event (filter-then-cluster) | #850 | inline-event-clustering | `frontend/src/lib/timeline/eventClustering.ts` (`splitYearLetters` filters via `eventLookup`) | `eventClustering.spec.ts#keeps a letter whose linkedEventId is absent from the lookup loose (filter-then-cluster, REQ-008)` | Done |
-| REQ-009 | `TimelineEntryDTO` carries nullable `linkedEventId` for LETTER entries, one batched pass, no new column/migration, not @Schema(REQUIRED); a multi-event letter links deterministically (earliest date, then id) | #850 | inline-event-clustering | `backend/.../timeline/TimelineEntryDTO.java`, `backend/.../timeline/TimelineService.java#resolveLetterEventLinks`, `frontend/src/lib/generated/api.ts` | `TimelineServiceTest#letter_in_a_curated_events_documents_carries_that_events_id`, `#letter_in_no_curated_event_has_null_linkedEventId`, `#multi_event_letter_links_deterministically_to_the_earliest_event` | Done |
-| REQ-010 | event/letter/sender/receiver text via Svelte `{...}` escaping; no `{@html}` anywhere in `lib/timeline/` (grep gate, CWE-79) | #850 | inline-event-clustering | `frontend/src/lib/timeline/*.svelte` | `timeline-no-raw-html.spec.ts#no timeline component contains the raw-HTML directive`; `EventCluster.svelte.spec.ts#renders an HTML-bearing event title verbatim as text, never as markup` | Done |
-| REQ-011 | wrapping header keeps #842 add-event CTA + #780 filter trigger; meta-line drops the grouping segment | #850 | inline-event-clustering | `frontend/src/routes/zeitstrahl/+page.svelte` | `page.svelte.spec.ts#renders the meta sub-line with range and counts, no grouping segment`, `#drops the letters segment instead of showing "0 Briefe"` (no "Gruppierung") | Done |
-| 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 (REQ-015)` | Done |

backend/src/main/java/org/raddatz/familienarchiv/timeline/TimelineEntryDTO.java

@@ -28,13 +28,6 @@ import java.util.UUID;
  * They are deliberately NOT {@code @Schema(requiredMode = REQUIRED)} so the generated TypeScript
  * types stay optional.
  *
- * <p><b>Letter→event link ({@code linkedEventId}):</b> for a {@link Kind#LETTER} entry, the id of
- * the curated {@link TimelineEvent} whose {@code documents} set contains the letter's document, or
- * {@code null} when the letter is referenced by no curated event (#850). Computed on read from the
- * existing {@code timeline_event_documents} join — no new column. {@code null} for non-letter
- * entries. Deliberately NOT {@code @Schema(requiredMode = REQUIRED)} so the generated TypeScript
- * type stays optional.
- *
  * <p>Callers of {@code TimelineEventService.assembleDerivedEvents()} must independently enforce
  * {@code READ_ALL} authorization before invoking that method (see ADR-043).
  */
@@ -54,7 +47,6 @@ public record TimelineEntryDTO(
         DerivedEventType derivedType,
         UUID rootTagId,
         String rootTagName,
-        String rootTagColor,
+        String rootTagColor
-        UUID linkedEventId
 ) {
 }

backend/src/main/java/org/raddatz/familienarchiv/timeline/TimelineEventService.java

@@ -267,7 +267,7 @@ public class TimelineEventService {
                         p.getBirthDate(), null,
                         p.getDisplayName(), EventType.PERSONAL,
                         null, null, List.of(p.getId()), DerivedEventType.BIRTH,
-                        null, null, null, null))
+                        null, null, null))
                 .toList();
     }
 
@@ -279,7 +279,7 @@ public class TimelineEventService {
                         p.getDeathDate(), null,
                         p.getDisplayName(), EventType.PERSONAL,
                         null, null, List.of(p.getId()), DerivedEventType.DEATH,
-                        null, null, null, null))
+                        null, null, null))
                 .toList();
     }
 
@@ -304,7 +304,7 @@ public class TimelineEventService {
                         null, null,
                         List.of(r.getPerson().getId(), r.getRelatedPerson().getId()),
                         DerivedEventType.MARRIAGE,
-                        null, null, null, null));
+                        null, null, null));
             }
         }
         return result;

backend/src/main/java/org/raddatz/familienarchiv/timeline/TimelineService.java

@@ -80,20 +80,13 @@ public class TimelineService {
         // Resolve generation person IDs once — used across all three layers
         Set<UUID> genPersonIds = resolveGenerationPersonIds(filter.generation());
 
-        // Fetch curated events once; the events that survive the filter below feed both the
-        // event entries and the batched letter→event link pass (resolveLetterEventLinks), so the
-        // membership pass costs no extra query and touches only on-screen events. REQ-009.
-        List<TimelineEvent> allEvents = eventRepository.findAll();
-
         // ── curated events ───────────────────────────────────────────────────
         List<TimelineEntryDTO> entries = new ArrayList<>();
-        List<TimelineEvent> filteredEvents = new ArrayList<>();
+        for (TimelineEvent ev : eventRepository.findAll()) {
-        for (TimelineEvent ev : allEvents) {
             if (!passesTypeFilter(ev.getType(), filter.type())) continue;
             if (!passesPersonFilter(ev.getPersons(), filter.personId())) continue;
             if (!passesGenerationFilter(ev.getPersons(), genPersonIds)) continue;
             if (!passesYearFilter(ev.getEventDate(), ev.getPrecision(), filter)) continue;
-            filteredEvents.add(ev);
             entries.add(mapEvent(ev));
         }
 
@@ -114,9 +107,8 @@ public class TimelineService {
             letters.add(doc);
         }
         Map<UUID, RootTag> rootByDocId = resolveLetterRootTags(letters);
-        Map<UUID, UUID> eventByDocId = resolveLetterEventLinks(letters, filteredEvents);
         for (Document doc : letters) {
-            entries.add(mapDocument(doc, rootByDocId, eventByDocId));
+            entries.add(mapDocument(doc, rootByDocId));
         }
 
         return bucket(entries);
@@ -237,13 +229,11 @@ public class TimelineService {
                 null,
                 null,
                 null,
-                null,
                 null
         );
     }
 
-    private TimelineEntryDTO mapDocument(Document doc, Map<UUID, RootTag> rootByDocId,
+    private TimelineEntryDTO mapDocument(Document doc, Map<UUID, RootTag> rootByDocId) {
-                                         Map<UUID, UUID> eventByDocId) {
         RootTag root = rootByDocId.get(doc.getId());
         return new TimelineEntryDTO(
                 Kind.LETTER,
@@ -261,50 +251,10 @@ public class TimelineService {
                 null,
                 root == null ? null : root.id(),
                 root == null ? null : root.name(),
-                root == null ? null : root.color(),
+                root == null ? null : root.color()
-                eventByDocId.get(doc.getId())
         );
     }
 
-    /**
-     * Resolves each letter's linked curated event in one batched pass, keyed by document id: the
-     * event whose {@code documents} set contains the letter (REQ-009). A single doc→event map is
-     * built over the already-loaded events — no per-letter query ({@code TimelineEvent.documents}
-     * carries {@code @BatchSize(50)}). When a document is referenced by more than one curated
-     * event, the earliest-dated event wins (then lowest {@code eventId}); the pass runs over a
-     * stably-ordered copy so the link is a deterministic property of the data, not a coin-flip on
-     * the undefined repository iteration order ({@code putIfAbsent} keeps the first = winner). The
-     * map is built only over the events that survived the timeline filter, so the lazy
-     * {@code documents} collection is hydrated for on-screen events alone (finding #10); a letter
-     * whose only linking event was filtered out links to nothing, matching the frontend's
-     * filter-then-cluster (#850). Logs nothing — the assembly path keeps UUIDs out of logs (§2.7).
-     */
-    private Map<UUID, UUID> resolveLetterEventLinks(List<Document> letters, List<TimelineEvent> events) {
-        Set<UUID> letterDocIds = letters.stream().map(Document::getId).collect(Collectors.toSet());
-        if (letterDocIds.isEmpty()) return Map.of();
-
-        // Stable order so a multi-event letter links deterministically: earliest event date
-        // (undated last), then lowest id. putIfAbsent below then keeps the winner (REQ-009).
-        List<TimelineEvent> ordered = events.stream()
-                .sorted(Comparator
-                        .comparing(TimelineEvent::getEventDate,
-                                Comparator.nullsLast(Comparator.naturalOrder()))
-                        .thenComparing(TimelineEvent::getId))
-                .toList();
-
-        Map<UUID, UUID> eventByDocId = new HashMap<>();
-        for (TimelineEvent ev : ordered) {
-            Set<Document> linkedDocs = ev.getDocuments();
-            if (linkedDocs == null) continue;
-            for (Document linked : linkedDocs) {
-                if (letterDocIds.contains(linked.getId())) {
-                    eventByDocId.putIfAbsent(linked.getId(), ev.getId());
-                }
-            }
-        }
-        return eventByDocId;
-    }
-
     /**
      * Resolves each letter's primary root tag in one batched pass, keyed by document id — no
      * per-letter N+1: each letter contributes only its alphabetically-first assigned tag (#835),

backend/src/test/java/org/raddatz/familienarchiv/timeline/TimelineServiceTest.java

@@ -69,10 +69,10 @@ class TimelineServiceTest {
         UUID id2 = UUID.fromString("00000000-0000-0000-0000-000000000002");
         var e1 = new TimelineEntryDTO(Kind.LETTER, DatePrecision.DAY, false, "", "",
                 LocalDate.of(1914, 7, 28), null, "Same Title", null, null, id1, List.of(), null,
-                null, null, null, null);
+                null, null, null);
         var e2 = new TimelineEntryDTO(Kind.LETTER, DatePrecision.DAY, false, "", "",
                 LocalDate.of(1914, 7, 28), null, "Same Title", null, null, id2, List.of(), null,
-                null, null, null, null);
+                null, null, null);
 
         var sorted = List.of(e2, e1).stream()
                 .sorted(TimelineService.WITHIN_BAND_ORDER)
@@ -511,106 +511,6 @@ class TimelineServiceTest {
         verify(tagService, times(1)).resolveRootTags(anyList());
     }
 
-    // ─── letter→event link (#850, REQ-009) ───────────────────────────────────
-
-    @Test
-    void letter_in_a_curated_events_documents_carries_that_events_id() {
-        // REQ-009: linkedEventId = the curated event whose documents set contains the letter.
-        Document letterDoc = docWithDate(LocalDate.of(1915, 5, 1), DatePrecision.MONTH);
-        UUID eventId = UUID.randomUUID();
-        TimelineEvent event = TimelineEvent.builder().id(eventId)
-                .title("Briefe von der Front").type(EventType.PERSONAL)
-                .documents(new HashSet<>(Set.of(letterDoc)))
-                .build(); // no eventDate → event lands undated, leaving the year band to the letter
-        when(eventRepository.findAll()).thenReturn(List.of(event));
-        when(timelineEventService.assembleDerivedEvents()).thenReturn(List.of());
-        when(documentService.getAllForTimeline()).thenReturn(List.of(letterDoc));
-
-        TimelineEntryDTO entry = onlyLetterEntry(timelineService.assemble(noFilters()));
-
-        assertThat(entry.linkedEventId()).isEqualTo(eventId);
-    }
-
-    @Test
-    void letter_in_no_curated_event_has_null_linkedEventId() {
-        // REQ-009: a letter referenced by no curated event → linkedEventId null; the frontend
-        // then renders it as a loose chronological letter (REQ-006).
-        Document letterDoc = docWithDate(LocalDate.of(1915, 5, 1), DatePrecision.MONTH);
-        TimelineEvent event = TimelineEvent.builder().id(UUID.randomUUID())
-                .title("Anderes Ereignis").type(EventType.PERSONAL)
-                .documents(new HashSet<>(Set.of(Document.builder().id(UUID.randomUUID()).build())))
-                .build();
-        when(eventRepository.findAll()).thenReturn(List.of(event));
-        when(timelineEventService.assembleDerivedEvents()).thenReturn(List.of());
-        when(documentService.getAllForTimeline()).thenReturn(List.of(letterDoc));
-
-        TimelineEntryDTO entry = onlyLetterEntry(timelineService.assemble(noFilters()));
-
-        assertThat(entry.linkedEventId()).isNull();
-    }
-
-    @Test
-    void multi_event_letter_links_deterministically_to_the_earliest_event() {
-        // REQ-009: a document referenced by >1 curated event links to the earliest-dated event
-        // (then lowest id), independent of repository iteration order — not a coin-flip on
-        // findAll()'s undefined order.
-        Document shared = docWithDate(LocalDate.of(1916, 5, 1), DatePrecision.MONTH);
-        TimelineEvent earlier = TimelineEvent.builder()
-                .id(UUID.fromString("00000000-0000-0000-0000-000000000001"))
-                .title("Frühes Ereignis").type(EventType.PERSONAL)
-                .eventDate(LocalDate.of(1913, 3, 1)).precision(DatePrecision.MONTH)
-                .documents(new HashSet<>(Set.of(shared)))
-                .build();
-        TimelineEvent later = TimelineEvent.builder()
-                .id(UUID.fromString("00000000-0000-0000-0000-000000000002"))
-                .title("Spätes Ereignis").type(EventType.PERSONAL)
-                .eventDate(LocalDate.of(1914, 3, 1)).precision(DatePrecision.MONTH)
-                .documents(new HashSet<>(Set.of(shared)))
-                .build();
-        when(timelineEventService.assembleDerivedEvents()).thenReturn(List.of());
-        when(documentService.getAllForTimeline()).thenReturn(List.of(shared));
-
-        // `later` first in iteration: a naive putIfAbsent would wrongly pick it.
-        when(eventRepository.findAll()).thenReturn(List.of(later, earlier));
-        assertThat(theLetter(timelineService.assemble(noFilters())).linkedEventId())
-                .isEqualTo(earlier.getId());
-
-        // Reversed order yields the same winner — the link is order-independent.
-        when(eventRepository.findAll()).thenReturn(List.of(earlier, later));
-        assertThat(theLetter(timelineService.assemble(noFilters())).linkedEventId())
-                .isEqualTo(earlier.getId());
-    }
-
-    @Test
-    void letter_linked_only_to_a_filtered_out_event_has_null_linkedEventId() {
-        // finding #10: the link pass runs over the events that survived the filter, not all of
-        // them. A letter whose only linking event is excluded by the active filter links to
-        // nothing (the frontend would drop it loose anyway) — and the lazy `documents` collection
-        // is never hydrated for events that are off-screen.
-        Document letterDoc = docWithDate(LocalDate.of(1916, 5, 1), DatePrecision.MONTH);
-        TimelineEvent worldEvent = TimelineEvent.builder().id(UUID.randomUUID())
-                .title("Somme").type(EventType.HISTORICAL)
-                .documents(new HashSet<>(Set.of(letterDoc)))
-                .build();
-        when(eventRepository.findAll()).thenReturn(List.of(worldEvent));
-        when(timelineEventService.assembleDerivedEvents()).thenReturn(List.of());
-        when(documentService.getAllForTimeline()).thenReturn(List.of(letterDoc));
-
-        // Filter to PERSONAL only → the HISTORICAL event is filtered out of the view.
-        TimelineEntryDTO entry = theLetter(timelineService.assemble(
-                new TimelineFilter(null, null, EventType.PERSONAL, null, null)));
-
-        assertThat(entry.linkedEventId()).isNull();
-    }
-
-    private static TimelineEntryDTO theLetter(TimelineDTO result) {
-        return java.util.stream.Stream.concat(
-                        result.years().stream().flatMap(y -> y.entries().stream()),
-                        result.undated().stream())
-                .filter(e -> e.kind() == Kind.LETTER)
-                .findFirst().orElseThrow();
-    }
-
     private static TimelineEntryDTO onlyLetterEntry(TimelineDTO result) {
         assertThat(result.years()).hasSize(1);
         return result.years().get(0).entries().get(0);
@@ -623,7 +523,7 @@ class TimelineServiceTest {
     private static TimelineEntryDTO letter(LocalDate date, DatePrecision precision, String title) {
         return new TimelineEntryDTO(Kind.LETTER, precision, false, "", "",
                 date, null, title, null, null, UUID.randomUUID(), List.of(), null,
-                null, null, null, null);
+                null, null, null);
     }
 
     private static Document docWithDate(LocalDate date, DatePrecision precision) {

frontend/e2e/zeitstrahl-filter.spec.ts

@@ -1,93 +0,0 @@
-import AxeBuilder from '@axe-core/playwright';
-import { test, expect, type APIRequestContext } from '@playwright/test';
-
-/**
- * Global /zeitstrahl layer filter (#780). Runs against the real stack with the
- * seeded admin session (auth.setup). Covers the primary journey (hide the
- * Letters layer → letter cards vanish + the trigger reports one active filter →
- * reset restores everything) and a 375px axe pass with the collapsible open in
- * both light and dark mode.
- *
- * #779 (the /zeitstrahl route) is merged, so this spec is NOT skipped. Per
- * e2e/CLAUDE.md, E2E is not yet wired into CI — this axe gate runs locally only
- * for now.
- */
-
-const stamp = () => new Date().toISOString().replace(/[^0-9]/g, '');
-
-async function createPerson(request: APIRequestContext, firstName: string, lastName: string) {
-	const res = await request.post('/api/persons', {
-		data: { personType: 'PERSON', firstName, lastName }
-	});
-	if (!res.ok()) throw new Error(`create person failed: ${res.status()}`);
-	return (await res.json()).id as string;
-}
-
-/** Seeds one dated letter so the timeline has content (and a LetterCard to hide). */
-async function seedDatedLetter(request: APIRequestContext, isoDate: string, title: string) {
-	const senderId = await createPerson(request, 'Filter-Test', `Absender ${stamp()}`);
-	const receiverId = await createPerson(request, 'Filter-Test', `Empfaenger ${stamp()}`);
-
-	const createRes = await request.post('/api/documents', { multipart: { title } });
-	if (!createRes.ok()) throw new Error(`create document failed: ${createRes.status()}`);
-	const docId = (await createRes.json()).id as string;
-
-	const put = await request.put(`/api/documents/${docId}`, {
-		multipart: {
-			title,
-			documentDate: isoDate,
-			metaDatePrecision: 'DAY',
-			senderId,
-			receiverIds: receiverId
-		}
-	});
-	if (!put.ok()) throw new Error(`update document failed: ${put.status()}`);
-}
-
-test.describe('Zeitstrahl — layer filter (#780)', () => {
-	test('hiding the Letters layer removes letter cards and reports the active count; reset restores', async ({
-		page,
-		request
-	}) => {
-		// A sparse year keeps the seeded letter an individual card (not a dense strip).
-		const title = `E2E Filter Brief ${stamp()}`;
-		await seedDatedLetter(request, '1903-03-03', title);
-
-		await page.goto('/zeitstrahl');
-		await page.waitForSelector('[data-hydrated]');
-		await expect(page.getByText(title)).toBeVisible();
-
-		await page.getByTestId('timeline-filter-trigger').click();
-		await page.getByTestId('timeline-filter-letters').click();
-
-		await expect(page.getByText(title)).toHaveCount(0);
-		await expect(page.getByTestId('timeline-filter-trigger')).toContainText('1 aktiv');
-
-		await page.getByTestId('timeline-filter-reset').click();
-		await expect(page.getByText(title)).toBeVisible();
-	});
-
-	test('no wcag2a/wcag2aa violations at 375px with the filter bar open (light + dark)', async ({
-		page,
-		request
-	}) => {
-		await seedDatedLetter(request, '1915-06-15', `E2E Filter A11y ${stamp()}`);
-
-		await page.setViewportSize({ width: 375, height: 800 });
-		await page.goto('/zeitstrahl');
-		await page.waitForSelector('[data-hydrated]');
-
-		// Open the collapsible so axe scans the toggles, not just the trigger.
-		await page.getByTestId('timeline-filter-trigger').click();
-		await expect(page.getByTestId('timeline-filter-personal')).toBeVisible();
-
-		const scan = () => new AxeBuilder({ page }).withTags(['wcag2a', 'wcag2aa']).analyze();
-
-		const light = await scan();
-		expect(light.violations, JSON.stringify(light.violations, null, 2)).toEqual([]);
-
-		await page.evaluate(() => document.documentElement.setAttribute('data-theme', 'dark'));
-		const dark = await scan();
-		expect(dark.violations, JSON.stringify(dark.violations, null, 2)).toEqual([]);
-	});
-});

frontend/messages/de.json

@@ -188,7 +188,6 @@
 	"person_hint_generation": "Generation in der Familie (G 0 = älteste Generation)",
 	"person_year_error": "Bitte eine vierstellige Jahreszahl eingeben",
 	"person_years_error_order": "Geburtsjahr muss vor dem Todesjahr liegen",
-	"person_add_event": "Ereignis für diese Person",
 	"person_docs_heading": "Gesendete Dokumente",
 	"person_no_docs": "Diese Person ist noch nicht als Absender verknüpft.",
 	"person_received_docs_heading": "Empfangene Dokumente",
@@ -1036,7 +1035,6 @@
 	"nav_geschichten": "Geschichten",
 	"nav_zeitstrahl": "Zeitstrahl",
 	"timeline_heading": "Zeitstrahl",
-	"timeline_add_event": "Ereignis hinzufügen",
 	"timeline_empty_state": "Noch keine Ereignisse.",
 	"timeline_undated_section": "Ohne Datum",
 	"timeline_unknown_person": "Unbekannt",
@@ -1049,26 +1047,16 @@
 	"timeline_derived_birth": "Geburt",
 	"timeline_derived_death": "Tod",
 	"timeline_derived_marriage": "Heirat",
+	"timeline_grouping_date": "Gruppierung: Datum",
 	"timeline_provenance_derived": "abgeleitet",
 	"timeline_provenance_curated": "kuratiert",
-	"timeline_bucket_show_more": "+ {count} weitere Briefe anzeigen",
-	"timeline_bucket_show_less": "Weniger anzeigen",
 	"timeline_letter_glyph_label": "Brief",
-	"timeline_cluster_letter_count": "{count} Briefe",
 	"timeline_tag_chip_label": "Thema",
 	"timeline_layer_historical_suffix": "historisch",
 	"timeline_strip_density_caption": "Monats-Dichte",
 	"timeline_events_count": "{count} Ereignisse",
 	"timeline_letters_count_singular": "1 Brief",
 	"timeline_events_count_singular": "1 Ereignis",
-	"timeline_filter_label_layers": "Ebenen anzeigen",
-	"timeline_filter_layer_personal": "Persönliche Ereignisse",
-	"timeline_filter_layer_historical": "Historische Ereignisse",
-	"timeline_filter_layer_letters": "Briefe",
-	"timeline_filter_trigger": "Filter",
-	"timeline_filter_trigger_active": "Filter ({count} aktiv)",
-	"timeline_filter_reset": "Filter zurücksetzen",
-	"timeline_filter_empty_state": "Keine Einträge entsprechen diesen Filtern.",
 	"event_editor_new_title": "Neues Ereignis",
 	"event_editor_edit_title": "Ereignis bearbeiten",
 	"event_editor_section_when": "Wann",

frontend/messages/en.json

@@ -188,7 +188,6 @@
 	"person_hint_generation": "Generation within the family (G 0 = oldest generation)",
 	"person_year_error": "Please enter a four-digit year",
 	"person_years_error_order": "Birth year must be before death year",
-	"person_add_event": "Add event for this person",
 	"person_docs_heading": "Sent documents",
 	"person_no_docs": "This person has not yet been linked as a sender.",
 	"person_received_docs_heading": "Received documents",
@@ -1036,7 +1035,6 @@
 	"nav_geschichten": "Stories",
 	"nav_zeitstrahl": "Timeline",
 	"timeline_heading": "Timeline",
-	"timeline_add_event": "Add event",
 	"timeline_empty_state": "No events yet.",
 	"timeline_undated_section": "Without Date",
 	"timeline_unknown_person": "Unknown",
@@ -1049,26 +1047,16 @@
 	"timeline_derived_birth": "Birth",
 	"timeline_derived_death": "Death",
 	"timeline_derived_marriage": "Marriage",
+	"timeline_grouping_date": "Grouping: Date",
 	"timeline_provenance_derived": "derived",
 	"timeline_provenance_curated": "curated",
-	"timeline_bucket_show_more": "+ {count} more letters",
-	"timeline_bucket_show_less": "Show fewer",
 	"timeline_letter_glyph_label": "Letter",
-	"timeline_cluster_letter_count": "{count} letters",
 	"timeline_tag_chip_label": "Topic",
 	"timeline_layer_historical_suffix": "historical",
 	"timeline_strip_density_caption": "Monthly density",
 	"timeline_events_count": "{count} events",
 	"timeline_letters_count_singular": "1 letter",
 	"timeline_events_count_singular": "1 event",
-	"timeline_filter_label_layers": "Show layers",
-	"timeline_filter_layer_personal": "Personal events",
-	"timeline_filter_layer_historical": "Historical events",
-	"timeline_filter_layer_letters": "Letters",
-	"timeline_filter_trigger": "Filter",
-	"timeline_filter_trigger_active": "Filter ({count} active)",
-	"timeline_filter_reset": "Reset filters",
-	"timeline_filter_empty_state": "No entries match these filters.",
 	"event_editor_new_title": "New event",
 	"event_editor_edit_title": "Edit event",
 	"event_editor_section_when": "When",

frontend/messages/es.json

@@ -188,7 +188,6 @@
 	"person_hint_generation": "Generación dentro de la familia (G 0 = generación más antigua)",
 	"person_year_error": "Introduzca un año de cuatro dígitos",
 	"person_years_error_order": "El año de nacimiento debe ser anterior al año de fallecimiento",
-	"person_add_event": "Añadir evento para esta persona",
 	"person_docs_heading": "Documentos enviados",
 	"person_no_docs": "Esta persona aún no está vinculada como remitente.",
 	"person_received_docs_heading": "Documentos recibidos",
@@ -1036,7 +1035,6 @@
 	"nav_geschichten": "Historias",
 	"nav_zeitstrahl": "Línea de tiempo",
 	"timeline_heading": "Línea de tiempo",
-	"timeline_add_event": "Añadir evento",
 	"timeline_empty_state": "Aún no hay eventos.",
 	"timeline_undated_section": "Sin Fecha",
 	"timeline_unknown_person": "Desconocido",
@@ -1049,26 +1047,16 @@
 	"timeline_derived_birth": "Nacimiento",
 	"timeline_derived_death": "Fallecimiento",
 	"timeline_derived_marriage": "Matrimonio",
+	"timeline_grouping_date": "Agrupación: Fecha",
 	"timeline_provenance_derived": "derivado",
 	"timeline_provenance_curated": "curado",
-	"timeline_bucket_show_more": "+ {count} cartas más",
-	"timeline_bucket_show_less": "Mostrar menos",
 	"timeline_letter_glyph_label": "Carta",
-	"timeline_cluster_letter_count": "{count} cartas",
 	"timeline_tag_chip_label": "Tema",
 	"timeline_layer_historical_suffix": "histórico",
 	"timeline_strip_density_caption": "Densidad mensual",
 	"timeline_events_count": "{count} eventos",
 	"timeline_letters_count_singular": "1 carta",
 	"timeline_events_count_singular": "1 evento",
-	"timeline_filter_label_layers": "Mostrar capas",
-	"timeline_filter_layer_personal": "Eventos personales",
-	"timeline_filter_layer_historical": "Eventos históricos",
-	"timeline_filter_layer_letters": "Cartas",
-	"timeline_filter_trigger": "Filtro",
-	"timeline_filter_trigger_active": "Filtro ({count} activos)",
-	"timeline_filter_reset": "Restablecer filtros",
-	"timeline_filter_empty_state": "Ninguna entrada coincide con estos filtros.",
 	"event_editor_new_title": "Nuevo evento",
 	"event_editor_edit_title": "Editar evento",
 	"event_editor_section_when": "Cuándo",

frontend/src/lib/generated/api.ts

@@ -2467,8 +2467,6 @@ export interface components {
             rootTagId?: string;
             rootTagName?: string;
             rootTagColor?: string;
-            /** Format: uuid */
-            linkedEventId?: string;
         };
         TimelineYearDTO: {
             /** Format: int32 */

frontend/src/lib/messages.spec.ts

@@ -74,10 +74,9 @@ describe('message key parity', () => {
 	// every locale so no surface ever falls back to a missing translation.
 	it('zeitstrahl visual-fidelity keys are present in all locales (#833 REQ-015)', () => {
 		const requiredKeys = [
+			'timeline_grouping_date',
 			'timeline_provenance_derived',
 			'timeline_provenance_curated',
-			'timeline_bucket_show_more',
-			'timeline_bucket_show_less',
 			'timeline_letter_glyph_label',
 			'timeline_layer_historical_suffix',
 			'timeline_strip_density_caption',
@@ -99,47 +98,4 @@ describe('message key parity', () => {
 		expect(en).toMatchObject({ timeline_tag_chip_label: 'Topic' });
 		expect(es).toMatchObject({ timeline_tag_chip_label: 'Tema' });
 	});
-
-	// #850 finding #6: the event-card letter count carries an sr-only "{count} Briefe" so the
-	// bare "· 2" never announces to a screen reader without context.
-	it('zeitstrahl cluster letter-count key is present in all locales (#850 finding #6)', () => {
-		expect(de).toHaveProperty('timeline_cluster_letter_count');
-		expect(en).toHaveProperty('timeline_cluster_letter_count');
-		expect(es).toHaveProperty('timeline_cluster_letter_count');
-	});
-
-	// #780 REQ-010: the layer-filter strings are Paraglide keys in every locale.
-	// timeline_filter_trigger (0 active) and timeline_filter_trigger_active ({count},
-	// ≥1 active) are distinct keys so the trigger never reads "Filter (0 aktiv)".
-	it('zeitstrahl layer-filter keys are present in all locales (#780 REQ-010)', () => {
-		const requiredKeys = [
-			'timeline_filter_label_layers',
-			'timeline_filter_layer_personal',
-			'timeline_filter_layer_historical',
-			'timeline_filter_layer_letters',
-			'timeline_filter_trigger',
-			'timeline_filter_trigger_active',
-			'timeline_filter_reset',
-			'timeline_filter_empty_state'
-		];
-		for (const key of requiredKeys) {
-			expect(de, `missing key in de: ${key}`).toHaveProperty(key);
-			expect(en, `missing key in en: ${key}`).toHaveProperty(key);
-			expect(es, `missing key in es: ${key}`).toHaveProperty(key);
-		}
-		// the active-count key carries the established {count} placeholder
-		expect(de.timeline_filter_trigger_active).toContain('{count}');
-		expect(en.timeline_filter_trigger_active).toContain('{count}');
-		expect(es.timeline_filter_trigger_active).toContain('{count}');
-	});
-
-	// #842: the two curator-affordance CTA labels (Zeitstrahl header + person page)
-	// are Paraglide keys present in every locale; the edit pencils reuse btn_edit.
-	it('curator-affordance CTA keys are present in all locales (#842)', () => {
-		for (const key of ['timeline_add_event', 'person_add_event']) {
-			expect(de, `missing key in de: ${key}`).toHaveProperty(key);
-			expect(en, `missing key in en: ${key}`).toHaveProperty(key);
-			expect(es, `missing key in es: ${key}`).toHaveProperty(key);
-		}
-	});
 });

frontend/src/lib/timeline/EventCluster.svelte

@@ -1,104 +0,0 @@
-<script lang="ts">
-import * as m from '$lib/paraglide/messages.js';
-import LetterCard from './LetterCard.svelte';
-import GlyphLabel from './GlyphLabel.svelte';
-import EventHeader from './EventHeader.svelte';
-import { entryKey } from './entryKey';
-import { CLUSTER_PREVIEW } from './eventClustering';
-import type { components } from '$lib/generated/api';
-
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-/**
- * A curated event with linked letters, rendered as one contained card: the event IS the card's
- * header (so its title reads once — never also as a floating pill, #850 REQ-002), and its letters
- * sit inside as compact `.lcard.ev` cards.
- *
- * - Same-year event (`event` given): the shared EventHeader carries the accent glyph + sr-only
- *   label, the title, a `{date} · {kuratiert|abgeleitet}` subtitle, the letter count, and — for a
- *   curator on a curated event — an edit link to `/zeitstrahl/events/{eventId}/edit` (REQ-002).
- * - Cross-year (`title` given, no `event`): a plain `✉ {title}` text header, no edit link, no pill
- *   chrome — it holds that other year's linked letters (REQ-004).
- *
- * A card shows its first {@link CLUSTER_PREVIEW} letters, then a keyboard-operable show-more/less
- * toggle reveals/collapses the rest instead of flooding the timeline (REQ-003).
- */
-let {
-	letters,
-	event = undefined,
-	title = '',
-	canWrite = false
-}: {
-	letters: TimelineEntryDTO[];
-	/** The same-year curated event whose letters this card holds — renders as the header. */
-	event?: TimelineEntryDTO;
-	/** Header label for a cross-year card (no `event`). */
-	title?: string;
-	canWrite?: boolean;
-} = $props();
-
-const count = $derived(letters.length);
-
-// First-5 preview + show-more (REQ-003): a large cluster stays readable instead of dumping every
-// card into the timeline.
-let expanded = $state(false);
-const visible = $derived(expanded ? letters : letters.slice(0, CLUSTER_PREVIEW));
-const hiddenCount = $derived(letters.length - CLUSTER_PREVIEW);
-</script>
-
-<section
-	class="my-3 overflow-hidden rounded-md border border-l-2 border-line border-l-brand-mint bg-surface shadow-sm"
-	data-testid="event-card"
->
-	{#if event}
-		<!-- A same-year curated event IS the card header (the shared EventHeader) — its title reads
-		     once here, never also as a floating pill (REQ-002); the edit pencil uses the single
-		     canEditEvent gate (REQ-010, #850 finding #5). -->
-		<header
-			data-testid="event-header"
-			class="flex items-center gap-2 border-b border-line bg-canvas px-3 py-2"
-		>
-			<EventHeader entry={event} canWrite={canWrite} count={count} />
-		</header>
-	{:else}
-		<!-- Cross-year card (REQ-004): the same event's letters in another year band get a plain
-		     ✉ text header — no pill chrome, no edit link. -->
-		<header
-			data-testid="event-header"
-			class="flex items-center gap-2 border-b border-line px-3 py-2"
-		>
-			<span class="font-serif text-sm font-bold whitespace-pre-line text-ink">
-				<GlyphLabel glyph="✉" label={m.timeline_letter_glyph_label()} />
-				{title}
-			</span>
-			<span data-testid="event-count" class="font-sans text-xs text-ink-3">
-				<span aria-hidden="true">· {count}</span>
-				<span class="sr-only">{m.timeline_cluster_letter_count({ count })}</span>
-			</span>
-		</header>
-	{/if}
-
-	<div class="px-3 py-2">
-		<ul class="space-y-1.5">
-			{#each visible as letter (entryKey(letter))}
-				<li>
-					<LetterCard entry={letter} variant="event" compact={true} />
-				</li>
-			{/each}
-		</ul>
-		{#if hiddenCount > 0}
-			<button
-				type="button"
-				data-testid="bucket-show-more"
-				aria-expanded={expanded}
-				onclick={() => (expanded = !expanded)}
-				style="display: inline-flex; align-items: center; min-height: 44px"
-				class="mt-1 px-1 font-sans text-xs font-semibold text-brand-navy hover:underline focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-navy"
-			>
-				{expanded
-					? m.timeline_bucket_show_less()
-					: m.timeline_bucket_show_more({ count: hiddenCount })}
-			</button>
-		{/if}
-	</div>
-</section>

frontend/src/lib/timeline/EventCluster.svelte.spec.ts

@@ -1,129 +0,0 @@
-import { describe, it, expect, afterEach } from 'vitest';
-import { cleanup, render } from 'vitest-browser-svelte';
-import { tick } from 'svelte';
-import * as m from '$lib/paraglide/messages.js';
-import EventCluster from './EventCluster.svelte';
-import { makeEntry } from './test-factories';
-import type { components } from '$lib/generated/api';
-
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-afterEach(() => cleanup());
-
-const EV_ID = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
-
-const makeEvent = (overrides: Partial<TimelineEntryDTO> = {}): TimelineEntryDTO =>
-	makeEntry({
-		kind: 'EVENT',
-		type: 'PERSONAL',
-		documentId: undefined,
-		eventId: EV_ID,
-		eventDate: '1916-07-06',
-		precision: 'DAY',
-		title: 'Ein gewaltiger Stadtbrand',
-		...overrides
-	});
-
-const letters = (n: number): TimelineEntryDTO[] =>
-	Array.from({ length: n }, (_, i) =>
-		makeEntry({ kind: 'LETTER', documentId: `doc-${i}`, title: `Brief ${i}`, linkedEventId: EV_ID })
-	);
-
-describe('EventCluster — contained event card (#850)', () => {
-	it('renders a data-testid event-card with the event title once (REQ-002)', () => {
-		render(EventCluster, { letters: letters(2), event: makeEvent() });
-		expect(document.querySelector('[data-testid="event-card"]')).not.toBeNull();
-		const occurrences = (document.body.textContent?.match(/Ein gewaltiger Stadtbrand/g) ?? [])
-			.length;
-		expect(occurrences).toBe(1);
-	});
-
-	it('shows the event-edit link for a curator on a curated event (REQ-002)', () => {
-		render(EventCluster, { letters: letters(2), event: makeEvent(), canWrite: true });
-		const edit = document.querySelector('[data-testid="event-edit"]') as HTMLAnchorElement;
-		expect(edit).not.toBeNull();
-		expect(edit.getAttribute('href')).toBe(`/zeitstrahl/events/${EV_ID}/edit`);
-	});
-
-	it('hides the event-edit link when canWrite is false', () => {
-		render(EventCluster, { letters: letters(2), event: makeEvent(), canWrite: false });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('hides the event-edit link for a derived event even with canWrite', () => {
-		render(EventCluster, {
-			letters: letters(2),
-			event: makeEvent({ derived: true, eventId: undefined, derivedType: 'BIRTH' }),
-			canWrite: true
-		});
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('renders its letters as compact a.lcard.ev cards (REQ-002)', () => {
-		render(EventCluster, { letters: letters(2), event: makeEvent() });
-		expect(document.querySelectorAll('a.lcard.ev').length).toBeGreaterThan(0);
-	});
-
-	it('shows the first 5 of 8 letters + a show-more toggle that expands to 8 then back to 5 (REQ-003)', async () => {
-		render(EventCluster, { letters: letters(8), event: makeEvent() });
-		expect(document.querySelectorAll('a.lcard').length).toBe(5);
-		const toggle = document.querySelector('[data-testid="bucket-show-more"]') as HTMLButtonElement;
-		expect(toggle).not.toBeNull();
-		expect(toggle.getAttribute('aria-expanded')).toBe('false');
-		expect(toggle.getBoundingClientRect().height).toBeGreaterThanOrEqual(44);
-
-		toggle.click();
-		await tick();
-		expect(document.querySelectorAll('a.lcard').length).toBe(8);
-		expect(toggle.getAttribute('aria-expanded')).toBe('true');
-
-		toggle.click();
-		await tick();
-		expect(document.querySelectorAll('a.lcard').length).toBe(5);
-	});
-
-	it('renders no show-more toggle when the cluster holds 5 or fewer letters', () => {
-		render(EventCluster, { letters: letters(5), event: makeEvent() });
-		expect(document.querySelector('[data-testid="bucket-show-more"]')).toBeNull();
-	});
-
-	it('renders a cross-year text header (✉ title, no event-edit, no pill) when no event is given (REQ-004)', () => {
-		render(EventCluster, {
-			letters: letters(2),
-			title: 'Briefe von der Front',
-			canWrite: true
-		});
-		expect(document.querySelector('[data-testid="event-card"]')).not.toBeNull();
-		expect(document.body.textContent).toContain('✉');
-		expect(document.body.textContent).toContain('Briefe von der Front');
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('pairs the cross-year ✉ glyph with an sr-only label so it is not a silent glyph (finding #6)', () => {
-		render(EventCluster, { letters: letters(2), title: 'Briefe von der Front' });
-		const header = document.querySelector('[data-testid="event-header"]') as HTMLElement;
-		const hidden = header.querySelector('[aria-hidden="true"]');
-		expect(hidden?.textContent).toContain('✉');
-		const srOnly = header.querySelector('.sr-only');
-		expect(srOnly?.textContent).toBe(m.timeline_letter_glyph_label());
-	});
-
-	it('gives the letter count an sr-only "{count} Briefe" label so "· 2" is not announced bare (finding #6)', () => {
-		render(EventCluster, { letters: letters(2), title: 'Briefe von der Front' });
-		const count = document.querySelector('[data-testid="event-count"]') as HTMLElement;
-		// the visible "· 2" stays aria-hidden; the sr-only sibling carries the meaning
-		expect(count.querySelector('[aria-hidden="true"]')?.textContent).toContain('· 2');
-		expect(count.querySelector('.sr-only')?.textContent).toBe(
-			m.timeline_cluster_letter_count({ count: 2 })
-		);
-	});
-
-	it('renders an HTML-bearing event title verbatim as text, never as markup (REQ-010)', () => {
-		render(EventCluster, {
-			letters: letters(1),
-			event: makeEvent({ title: '<img src=x onerror=alert(1)>' })
-		});
-		expect(document.querySelector('[data-testid="event-card"] img')).toBeNull();
-		expect(document.body.textContent).toContain('<img src=x onerror=alert(1)>');
-	});
-});

frontend/src/lib/timeline/EventHeader.svelte

@@ -1,69 +0,0 @@
-<script lang="ts">
-import * as m from '$lib/paraglide/messages.js';
-import GlyphLabel from './GlyphLabel.svelte';
-import { getAccentConfig, canEditEvent } from './eventCardConfig';
-import { timelineDateLabel } from './dateLabel';
-import type { components } from '$lib/generated/api';
-
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-/**
- * The shared header for a curated or derived timeline event — the accent glyph circle, the title,
- * and the `{date} · {kuratiert|abgeleitet}` subtitle, plus a curator edit pencil gated by the
- * single canEditEvent() contract. Rendered by EventPill (inside the floating axis pill) and by
- * EventCluster (as a same-year event-card header), so the glyph/title/subtitle markup and the
- * security-relevant edit gate live in one place (#850 finding #5). It renders three sibling nodes
- * (glyph circle, text block, optional edit pencil) into the parent's flex row — the parent owns
- * the wrapper (pill vs card header). An optional letter `count` appends a screen-reader-labeled
- * "· {count}" for the event-card case.
- */
-let {
-	entry,
-	canWrite = false,
-	count = undefined
-}: { entry: TimelineEntryDTO; canWrite?: boolean; count?: number } = $props();
-
-const config = $derived(getAccentConfig(entry));
-const dateLabel = $derived(timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd));
-// Provenance reads off entry.derived: a derived life-event is "abgeleitet", a curated event
-// "kuratiert"; the date is an optional prefix so an undated event still reads the provenance.
-const provenance = $derived(
-	entry.derived ? m.timeline_provenance_derived() : m.timeline_provenance_curated()
-);
-const subtitle = $derived(dateLabel ? `${dateLabel} · ${provenance}` : provenance);
-const canEdit = $derived(canEditEvent(entry, canWrite));
-</script>
-
-<span
-	class="flex h-7 w-7 shrink-0 items-center justify-center rounded-full {config.accent === 'curated'
-		? 'bg-brand-mint text-brand-navy'
-		: 'bg-brand-navy text-brand-mint'}"
->
-	<GlyphLabel glyph={config.glyph} label={config.label} />
-</span>
-<span class="min-w-0 text-left">
-	{#if entry.title}
-		<span class="block font-serif text-sm font-bold whitespace-pre-line text-brand-navy"
-			>{entry.title}</span
-		>
-	{/if}
-	<span class="block font-sans text-xs text-ink-3">
-		{subtitle}
-		{#if count !== undefined}
-			<span data-testid="event-count">
-				<span aria-hidden="true">· {count}</span>
-				<span class="sr-only">{m.timeline_cluster_letter_count({ count })}</span>
-			</span>
-		{/if}
-	</span>
-</span>
-{#if canEdit}
-	<a
-		data-testid="event-edit"
-		href="/zeitstrahl/events/{entry.eventId}/edit"
-		class="ml-auto rounded-sm px-1 font-sans text-xs text-ink-3 hover:text-brand-navy focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-navy"
-	>
-		<span aria-hidden="true">✎</span>
-		<span class="sr-only">{m.btn_edit()}</span>
-	</a>
-{/if}

frontend/src/lib/timeline/EventHeader.svelte.spec.ts

@@ -1,66 +0,0 @@
-import { describe, it, expect, afterEach } from 'vitest';
-import { cleanup, render } from 'vitest-browser-svelte';
-import * as m from '$lib/paraglide/messages.js';
-import EventHeader from './EventHeader.svelte';
-import { makeEntry } from './test-factories';
-import type { components } from '$lib/generated/api';
-
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-afterEach(() => cleanup());
-
-const EV_ID = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
-
-const curated = (overrides: Partial<TimelineEntryDTO> = {}): TimelineEntryDTO =>
-	makeEntry({
-		kind: 'EVENT',
-		type: 'PERSONAL',
-		derived: false,
-		eventId: EV_ID,
-		eventDate: '1916-07-06',
-		precision: 'DAY',
-		title: 'Ein gewaltiger Stadtbrand',
-		documentId: undefined,
-		...overrides
-	});
-
-describe('EventHeader', () => {
-	it('renders the glyph with an sr-only label, the title, and the provenance subtitle', () => {
-		render(EventHeader, { entry: curated() });
-		expect(document.querySelector('.sr-only')?.textContent).toBe(m.timeline_layer_family());
-		expect(document.body.textContent).toContain('Ein gewaltiger Stadtbrand');
-		expect(document.body.textContent).toContain(m.timeline_provenance_curated());
-	});
-
-	it('shows the edit pencil for a writer on a curated event (canEditEvent gate)', () => {
-		render(EventHeader, { entry: curated(), canWrite: true });
-		const edit = document.querySelector('[data-testid="event-edit"]') as HTMLAnchorElement;
-		expect(edit).not.toBeNull();
-		expect(edit.getAttribute('href')).toBe(`/zeitstrahl/events/${EV_ID}/edit`);
-	});
-
-	it('hides the edit pencil without write, for a derived event, and for a null eventId', () => {
-		render(EventHeader, { entry: curated(), canWrite: false });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-		cleanup();
-		render(EventHeader, { entry: curated({ derived: true }), canWrite: true });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-		cleanup();
-		render(EventHeader, { entry: curated({ eventId: undefined }), canWrite: true });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('renders a screen-reader-labeled letter count when a count is given', () => {
-		render(EventHeader, { entry: curated(), count: 3 });
-		const count = document.querySelector('[data-testid="event-count"]') as HTMLElement;
-		expect(count.querySelector('[aria-hidden="true"]')?.textContent).toContain('· 3');
-		expect(count.querySelector('.sr-only')?.textContent).toBe(
-			m.timeline_cluster_letter_count({ count: 3 })
-		);
-	});
-
-	it('omits the letter count when no count is given (the pill case)', () => {
-		render(EventHeader, { entry: curated() });
-		expect(document.querySelector('[data-testid="event-count"]')).toBeNull();
-	});
-});

frontend/src/lib/timeline/EventPill.svelte

@@ -1,21 +1,30 @@
 <script lang="ts">
-import EventHeader from './EventHeader.svelte';
+import * as m from '$lib/paraglide/messages.js';
 import { getAccentConfig } from './eventCardConfig';
+import { timelineDateLabel } from './dateLabel';
 import type { components } from '$lib/generated/api';
 
 type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
 
 /**
  * Centered axis pill for a derived life-event or a curated PERSONAL event
- * (REQ-007/008). The pill border keys off the accent (curated = mint, derived =
+ * (REQ-007/008). The glyph is wrapped aria-hidden with an sr-only label sibling
- * navy); its glyph, title, subtitle, and curator edit pencil are the shared
+ * (REQ-018). An edit affordance shows only for a curated event with an eventId
- * EventHeader, so the edit gate (canEditEvent) lives in one place — #842
+ * (never derived, never null — REQ-008).
- * REQ-005/007/008, #850 finding #5. The gate is UX only; the real boundary is the
- * #781 route guard + backend permission.
  */
-let { entry, canWrite = false }: { entry: TimelineEntryDTO; canWrite?: boolean } = $props();
+let { entry }: { entry: TimelineEntryDTO } = $props();
 
 const config = $derived(getAccentConfig(entry));
+const dateLabel = $derived(timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd));
+// Provenance reads off entry.derived (not the accent): a derived life-event is
+// "abgeleitet", a curated PERSONAL event is "kuratiert" (REQ-007).
+const provenance = $derived(
+	entry.derived ? m.timeline_provenance_derived() : m.timeline_provenance_curated()
+);
+// Provenance always shows; the date is an optional prefix so an undated event
+// still reads "abgeleitet"/"kuratiert" (REQ-007).
+const subtitle = $derived(dateLabel ? `${dateLabel} · ${provenance}` : provenance);
+const canEdit = $derived(!entry.derived && entry.eventId != null);
 </script>
 
 <div class="flex justify-center">
@@ -25,6 +34,32 @@ const config = $derived(getAccentConfig(entry));
 			? 'border-2 border-brand-mint'
 			: 'border border-brand-navy'}"
 	>
-		<EventHeader entry={entry} canWrite={canWrite} />
+		<span
+			class="flex h-7 w-7 shrink-0 items-center justify-center rounded-full {config.accent ===
+			'curated'
+				? 'bg-brand-mint text-brand-navy'
+				: 'bg-brand-navy text-brand-mint'}"
+		>
+			<span aria-hidden="true">{config.glyph}</span>
+			<span class="sr-only">{config.label}</span>
+		</span>
+		<span class="text-left">
+			{#if entry.title}
+				<span class="block font-serif text-sm font-bold whitespace-pre-line text-brand-navy"
+					>{entry.title}</span
+				>
+			{/if}
+			<span class="block font-sans text-xs text-ink-3">{subtitle}</span>
+		</span>
+		{#if canEdit}
+			<a
+				data-testid="event-edit"
+				href="/zeitstrahl/events/{entry.eventId}/edit"
+				class="ml-1 rounded-sm px-1 font-sans text-xs text-ink-3 hover:text-brand-navy focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-navy"
+			>
+				<span aria-hidden="true">✎</span>
+				<span class="sr-only">{m.btn_edit()}</span>
+			</a>
+		{/if}
 	</div>
 </div>

frontend/src/lib/timeline/EventPill.svelte.spec.ts

@@ -51,9 +51,8 @@ describe('EventPill', () => {
 		expect(srOnly?.textContent).toBe('Geburt');
 	});
 
-	it('shows an edit affordance for a curated PERSONAL event when canWrite is true (REQ-005)', () => {
+	it('shows an edit affordance for a curated PERSONAL event with an eventId (REQ-008)', () => {
 		render(EventPill, {
-			canWrite: true,
 			entry: makeEntry({
 				kind: 'EVENT',
 				derived: false,
@@ -67,45 +66,11 @@ describe('EventPill', () => {
 		});
 		const edit = document.querySelector('[data-testid="event-edit"]') as HTMLAnchorElement | null;
 		expect(edit).not.toBeNull();
-		expect(edit?.getAttribute('href')).toBe(`/zeitstrahl/events/${EVENT_ID}/edit`);
+		expect(edit?.getAttribute('href')).toContain(EVENT_ID);
 	});
 
-	it('renders no edit affordance for a curated PERSONAL event when canWrite is false (REQ-007)', () => {
+	it('shows no edit affordance when eventId is null (REQ-008)', () => {
 		render(EventPill, {
-			canWrite: false,
-			entry: makeEntry({
-				kind: 'EVENT',
-				derived: false,
-				type: 'PERSONAL',
-				eventId: EVENT_ID,
-				title: 'Auswanderung',
-				senderName: '',
-				receiverName: '',
-				documentId: undefined
-			})
-		});
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('renders no edit affordance when the canWrite prop is omitted (gate-closed default) (REQ-007)', () => {
-		render(EventPill, {
-			entry: makeEntry({
-				kind: 'EVENT',
-				derived: false,
-				type: 'PERSONAL',
-				eventId: EVENT_ID,
-				title: 'Auswanderung',
-				senderName: '',
-				receiverName: '',
-				documentId: undefined
-			})
-		});
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('shows no edit affordance when eventId is null even with canWrite (REQ-008)', () => {
-		render(EventPill, {
-			canWrite: true,
 			entry: makeEntry({
 				kind: 'EVENT',
 				derived: false,
@@ -120,8 +85,8 @@ describe('EventPill', () => {
 		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
 	});
 
-	it('shows no edit affordance for a derived event even with canWrite (REQ-008)', () => {
+	it('shows no edit affordance for a derived event (REQ-008)', () => {
-		render(EventPill, { canWrite: true, entry: derived('MARRIAGE', 'Heirat') });
+		render(EventPill, { entry: derived('MARRIAGE', 'Heirat') });
 		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
 	});
 

frontend/src/lib/timeline/LetterCard.svelte

@@ -11,33 +11,11 @@ type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
  * A single archive letter on the timeline: sender → receiver, title, and a
  * precision-aware date chip, linking to the document. Names/titles are
  * OCR/import-derived — rendered via default `{...}` escaping with
- * `whitespace-pre-line` for line breaks (REQ-010); never the raw-HTML directive.
+ * `whitespace-pre-line` for line breaks (REQ-021); never the raw-HTML directive.
- *
- * Inside an event cluster the card sits in the contained event card and renders as
- * the `.lcard.ev` `compact` variant (#850, REQ-002): tighter row, and the redundant
- * date chip is dropped when the title already embeds the date. The per-letter tag
- * chip can be suppressed via `suppressTagChip` for callers that already convey it.
  */
-let {
+let { entry }: { entry: TimelineEntryDTO } = $props();
-	entry,
-	variant = 'plain',
-	suppressTagChip = false,
-	compact = false
-}: {
-	entry: TimelineEntryDTO;
-	variant?: 'plain' | 'event';
-	suppressTagChip?: boolean;
-	compact?: boolean;
-} = $props();
 
-const isEventVariant = $derived(variant === 'event');
 const dateLabel = $derived(timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd));
-// Inside an event card the band frames the time, so a compact in-card letter drops the
-// redundant date chip — but ONLY when the (free-form OCR) title actually embeds the formatted
-// date, e.g. "H-0023 – 6. Juli 1916". A title without the date keeps its chip, so a letter like
-// "Brief an Mutter" never loses its month/day (the band frames only the year) — #850, finding #4.
-const titleEmbedsDate = $derived(!!dateLabel && !!entry.title && entry.title.includes(dateLabel));
-const showDate = $derived(!compact || !titleEmbedsDate);
 const sender = $derived(entry.senderName === '' ? m.timeline_unknown_person() : entry.senderName);
 const receiver = $derived(
 	entry.receiverName === '' ? m.timeline_unknown_person() : entry.receiverName
@@ -50,37 +28,28 @@ const receiver = $derived(
 <a
 	href="/documents/{entry.documentId}"
 	style="display: flex; flex-direction: column; justify-content: center; min-height: 44px"
-	class="lcard rounded-sm border border-l-[3px] border-line border-l-brand-mint bg-surface px-3 shadow-sm transition-colors hover:border-brand-mint focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-navy"
+	class="rounded-sm border border-l-[3px] border-line border-l-brand-mint bg-surface px-3 py-2 shadow-sm transition-colors hover:border-brand-mint focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-navy"
-	class:py-2={!compact}
-	class:py-1={compact}
-	class:ev={isEventVariant}
-	class:compact={compact}
 >
 	{#if entry.title}
 		<!-- ✉ + sr-only label are static chrome rendered as sibling nodes, NEVER
 		     interpolated into the escaped user title; the title keeps its own
 		     pre-line span for multi-line OCR text (REQ-008/016/021). -->
-		<span
+		<span class="font-serif text-sm font-bold break-words text-ink">
-			class="font-serif font-bold break-words text-ink"
-			class:text-sm={!compact}
-			class:text-xs={compact}
-		>
 			<GlyphLabel glyph="✉" label={m.timeline_letter_glyph_label()} />
 			<span class="whitespace-pre-line">{entry.title}</span>
 		</span>
 	{/if}
-	<span class="font-sans text-xs break-words text-ink-3" class:mt-0.5={!compact}>
+	<span class="mt-0.5 font-sans text-xs break-words text-ink-3">
 		<span class="font-serif whitespace-pre-line">{sender}</span>
 		<span aria-hidden="true">→</span>
 		<span class="font-serif whitespace-pre-line">{receiver}</span>
-		{#if dateLabel && showDate}
+		{#if dateLabel}
 			<span data-testid="letter-date"> · {dateLabel}</span>
 		{/if}
 	</span>
-	{#if entry.rootTagName && !suppressTagChip}
+	{#if entry.rootTagName}
 		<!-- The primary root-tag chip sits on its own line beneath the meta line
-		     (#835 §3); absent when the letter has no tag (REQ-006), and suppressed when
+		     (#835 §3); absent when the letter has no tag (REQ-005). -->
-		     the caller already conveys the topic (suppressTagChip). -->
 		<TagChip name={entry.rootTagName} color={entry.rootTagColor ?? null} />
 	{/if}
 </a>

frontend/src/lib/timeline/LetterCard.svelte.spec.ts

@@ -127,58 +127,3 @@ describe('LetterCard', () => {
 		expect(chip?.textContent).toContain('Familie');
 	});
 });
-
-describe('LetterCard — event-cluster variants (#850, REQ-002)', () => {
-	it('carries the .lcard.ev class in the event variant (REQ-002)', () => {
-		render(LetterCard, { entry: makeEntry(), variant: 'event' });
-		expect(document.querySelector('a.lcard.ev')).not.toBeNull();
-	});
-
-	it('is a plain card with no .ev marker by default (REQ-006)', () => {
-		render(LetterCard, { entry: makeEntry() });
-		expect(document.querySelector('a.ev')).toBeNull();
-	});
-
-	it('suppresses the per-letter tag chip when asked, even with a root tag', () => {
-		render(LetterCard, {
-			entry: makeEntry({ rootTagName: 'Krieg', rootTagColor: 'sienna' }),
-			suppressTagChip: true
-		});
-		expect(document.querySelector('[data-testid="tag-chip"]')).toBeNull();
-	});
-
-	it('still shows the per-letter tag chip when not suppressed', () => {
-		render(LetterCard, { entry: makeEntry({ rootTagName: 'Krieg', rootTagColor: 'sienna' }) });
-		expect(document.querySelector('[data-testid="tag-chip"]')).not.toBeNull();
-	});
-
-	it('drops the compact date chip only when the title actually embeds the formatted date (#850)', () => {
-		// An archive title like "H-0023 – 6. Juli 1916" already carries the date, so inside an
-		// event card (where the band frames the time) the redundant chip is dropped.
-		const entry = makeEntry({ eventDate: '1916-07-06', precision: 'DAY' });
-		const dateLabel = timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd);
-		render(LetterCard, { entry: { ...entry, title: `H-0023 – ${dateLabel}` }, compact: true });
-		expect(document.querySelector('[data-testid="letter-date"]')).toBeNull();
-		expect(document.body.textContent).toContain('Karl Raddatz'); // sender still shown
-	});
-
-	it('keeps the compact date chip when the title does NOT embed the date (#850, finding #4)', () => {
-		// Titles are free-form OCR text — a titled letter whose title carries no date must keep
-		// its month/day, since inside an event card the band frames only the year.
-		render(LetterCard, {
-			entry: makeEntry({ eventDate: '1916-07-06', precision: 'DAY', title: 'Brief an Mutter' }),
-			compact: true
-		});
-		expect(document.querySelector('[data-testid="letter-date"]')).not.toBeNull();
-	});
-
-	it('keeps the date in the compact variant when the letter has no title (#850)', () => {
-		render(LetterCard, { entry: makeEntry({ title: undefined }), compact: true });
-		expect(document.querySelector('[data-testid="letter-date"]')).not.toBeNull();
-	});
-
-	it('renders the compact variant on a single tighter row (#850)', () => {
-		render(LetterCard, { entry: makeEntry(), compact: true });
-		expect(document.querySelector('a.lcard.compact')).not.toBeNull();
-	});
-});

frontend/src/lib/timeline/TimelineFilters.svelte

@@ -1,133 +0,0 @@
-<script lang="ts">
-import * as m from '$lib/paraglide/messages.js';
-import { slide } from 'svelte/transition';
-import { hiddenLayerCount, isDefaultState, type TimelineLayerFilters } from './timelineFilter';
-
-// Presentation-only layer filter for the global /zeitstrahl (#780, REQ-001).
-// Holds no timeline data and never navigates or fetches — the route owns the
-// $state and derives the filtered view. Three $bindable layer booleans plus an
-// onChange notification hook are the whole contract.
-let {
-	personalOn = $bindable(true),
-	historicalOn = $bindable(true),
-	lettersOn = $bindable(true),
-	onChange
-}: {
-	personalOn?: boolean;
-	historicalOn?: boolean;
-	lettersOn?: boolean;
-	onChange?: () => void;
-} = $props();
-
-let open = $state(false);
-
-// Reuse the reduced-motion guard expression from documents/[id]/+page.svelte:57
-// for a new purpose — zeroing the slide duration so the collapsible opens
-// instantly when the reader prefers reduced motion (REQ-009).
-const prefersReducedMotion = $derived(
-	typeof window !== 'undefined' && window.matchMedia('(prefers-reduced-motion: reduce)').matches
-);
-const slideDuration = $derived(prefersReducedMotion ? 0 : 200);
-
-const filters: TimelineLayerFilters = $derived({ personalOn, historicalOn, lettersOn });
-const hiddenCount = $derived(hiddenLayerCount(filters));
-const anyLayerOff = $derived(!isDefaultState(filters));
-
-function reset() {
-	personalOn = true;
-	historicalOn = true;
-	lettersOn = true;
-	onChange?.();
-}
-</script>
-
-{#snippet layerToggle(label: string, testid: string, pressed: boolean, toggle: () => void)}
-	<button
-		type="button"
-		data-testid={testid}
-		aria-pressed={pressed}
-		onclick={toggle}
-		class="inline-flex min-h-[44px] items-center gap-2 rounded border px-3 font-sans text-sm transition-colors {pressed
-			? 'border-primary bg-primary text-primary-fg'
-			: 'border-line bg-muted text-ink-2 hover:bg-line'}"
-	>
-		<span
-			aria-hidden="true"
-			class="inline-flex h-4 w-4 items-center justify-center rounded-sm border {pressed
-				? 'border-primary-fg bg-primary-fg/20'
-				: 'border-ink-3'}"
-		>
-			{#if pressed}✓{/if}
-		</span>
-		{label}
-	</button>
-{/snippet}
-
-<section class="mb-6">
-	<!-- Sticky trigger kept in document flow so the hidden-layer count stays
-	     visible without clipping timeline content (REQ-007). -->
-	<div class="sticky top-16 z-20 bg-canvas py-2">
-		<button
-			type="button"
-			data-testid="timeline-filter-trigger"
-			aria-expanded={open}
-			aria-controls={open ? 'timeline-filter-panel' : undefined}
-			onclick={() => (open = !open)}
-			class="inline-flex min-h-[44px] items-center gap-2 rounded border border-line bg-surface px-4 font-sans text-xs font-bold tracking-widest text-ink-2 uppercase transition-colors hover:bg-muted"
-		>
-			{hiddenCount === 0
-				? m.timeline_filter_trigger()
-				: m.timeline_filter_trigger_active({ count: hiddenCount })}
-		</button>
-	</div>
-
-	{#if open}
-		<div id="timeline-filter-panel" transition:slide={{ duration: slideDuration }}>
-			<fieldset class="mt-2 rounded-sm border border-line bg-surface p-4">
-				<legend class="px-1 font-sans text-xs font-bold tracking-widest text-ink-3 uppercase">
-					{m.timeline_filter_label_layers()}
-				</legend>
-				<div class="flex flex-wrap gap-2">
-					{@render layerToggle(
-						m.timeline_filter_layer_personal(),
-						'timeline-filter-personal',
-						personalOn,
-						() => {
-							personalOn = !personalOn;
-							onChange?.();
-						}
-					)}
-					{@render layerToggle(
-						m.timeline_filter_layer_historical(),
-						'timeline-filter-historical',
-						historicalOn,
-						() => {
-							historicalOn = !historicalOn;
-							onChange?.();
-						}
-					)}
-					{@render layerToggle(
-						m.timeline_filter_layer_letters(),
-						'timeline-filter-letters',
-						lettersOn,
-						() => {
-							lettersOn = !lettersOn;
-							onChange?.();
-						}
-					)}
-				</div>
-
-				{#if anyLayerOff}
-					<button
-						type="button"
-						data-testid="timeline-filter-reset"
-						onclick={reset}
-						class="mt-3 inline-flex min-h-[44px] items-center font-sans text-sm text-primary underline-offset-2 hover:underline"
-					>
-						{m.timeline_filter_reset()}
-					</button>
-				{/if}
-			</fieldset>
-		</div>
-	{/if}
-</section>

frontend/src/lib/timeline/TimelineFilters.svelte.spec.ts

@@ -1,74 +0,0 @@
-import { describe, it, expect, vi, afterEach } from 'vitest';
-import { cleanup, render } from 'vitest-browser-svelte';
-import { page } from 'vitest/browser';
-import * as m from '$lib/paraglide/messages.js';
-import TimelineFilters from './TimelineFilters.svelte';
-
-afterEach(() => cleanup());
-
-const allOn = () => ({ personalOn: true, historicalOn: true, lettersOn: true, onChange: vi.fn() });
-
-async function openBar() {
-	await page.getByTestId('timeline-filter-trigger').click();
-}
-
-describe('TimelineFilters', () => {
-	it('renders the three layer toggles with accessible names inside a labelled group (REQ-001)', async () => {
-		render(TimelineFilters, allOn());
-		await openBar();
-		await expect
-			.element(page.getByRole('button', { name: m.timeline_filter_layer_personal() }))
-			.toBeVisible();
-		await expect
-			.element(page.getByRole('button', { name: m.timeline_filter_layer_historical() }))
-			.toBeVisible();
-		await expect
-			.element(page.getByRole('button', { name: m.timeline_filter_layer_letters() }))
-			.toBeVisible();
-		// the fieldset legend groups the toggles
-		await expect.element(page.getByText(m.timeline_filter_label_layers())).toBeVisible();
-	});
-
-	it('reflects a layer as pressed and flips it, firing onChange (REQ-001)', async () => {
-		const props = allOn();
-		render(TimelineFilters, props);
-		await openBar();
-		const personal = page.getByTestId('timeline-filter-personal');
-		await expect.element(personal).toHaveAttribute('aria-pressed', 'true');
-		await personal.click();
-		await expect.element(personal).toHaveAttribute('aria-pressed', 'false');
-		expect(props.onChange).toHaveBeenCalled();
-	});
-
-	it('shows a plain trigger when all layers are on and a count once a layer is hidden (REQ-007/010)', async () => {
-		render(TimelineFilters, allOn());
-		const trigger = page.getByTestId('timeline-filter-trigger');
-		await expect.element(trigger).toHaveTextContent(m.timeline_filter_trigger());
-		await expect.element(trigger).not.toHaveTextContent('aktiv');
-		await trigger.click();
-		await page.getByTestId('timeline-filter-letters').click();
-		await expect.element(trigger).toHaveTextContent(m.timeline_filter_trigger_active({ count: 1 }));
-	});
-
-	it('gives the trigger a 44px touch target (REQ-007)', async () => {
-		render(TimelineFilters, allOn());
-		await expect.element(page.getByTestId('timeline-filter-trigger')).toHaveClass(/min-h-\[44px\]/);
-	});
-
-	it('hides the reset button by default and restores all layers when activated (REQ-008)', async () => {
-		const props = allOn();
-		render(TimelineFilters, props);
-		await openBar();
-		const reset = page.getByTestId('timeline-filter-reset');
-		// absent (not just hidden) while every layer is on
-		expect(reset.query()).toBeNull();
-		await page.getByTestId('timeline-filter-historical').click();
-		await expect.element(reset).toBeVisible();
-		await reset.click();
-		await expect
-			.element(page.getByTestId('timeline-filter-historical'))
-			.toHaveAttribute('aria-pressed', 'true');
-		await expect.poll(() => reset.query()).toBeNull();
-		expect(props.onChange).toHaveBeenCalled();
-	});
-});

frontend/src/lib/timeline/TimelineView.svelte

@@ -6,7 +6,6 @@ import LetterCard from './LetterCard.svelte';
 import EventPill from './EventPill.svelte';
 import WorldBand from './WorldBand.svelte';
 import { entryKey } from './entryKey';
-import { buildEventLookup } from './eventClustering';
 import type { components } from '$lib/generated/api';
 
 type TimelineDTO = components['schemas']['TimelineDTO'];
@@ -19,19 +18,8 @@ type TimelineYearDTO = components['schemas']['TimelineYearDTO'];
  * empty timeline shows a calm message (REQ-017). `personId` is a declared seam
  * for the per-person rail (issue #10) and is undefined here; it is not passed to
  * leaf cards (REQ-025). Owns no <main> — the layout does.
- *
- * The event lookup is built once over the whole (already layer-filtered) timeline
- * and threaded to every band so a curated event's letters cluster under it inline
- * (#850, REQ-002). The undated bucket stays plain (events as pills, letters as
- * cards) — out of clustering scope.
  */
-let {
+let { timeline, personId = undefined }: { timeline: TimelineDTO; personId?: string } = $props();
-	timeline,
-	personId = undefined,
-	canWrite = false
-}: { timeline: TimelineDTO; personId?: string; canWrite?: boolean } = $props();
-
-const eventLookup = $derived(buildEventLookup(timeline));
 
 type Row = { t: 'band'; year: TimelineYearDTO } | { t: 'gap'; from: number; to: number };
 
@@ -62,7 +50,7 @@ const isEmpty = $derived(timeline.years.length === 0 && timeline.undated.length
 		{#each rows as row (row.t === 'band' ? `band-${row.year.year}` : `gap-${row.from}`)}
 			<li>
 				{#if row.t === 'band'}
-					<YearBand year={row.year} canWrite={canWrite} eventLookup={eventLookup} />
+					<YearBand year={row.year} />
 				{:else}
 					<GapSpan from={row.from} to={row.to} />
 				{/if}
@@ -87,9 +75,9 @@ const isEmpty = $derived(timeline.years.length === 0 && timeline.undated.length
 					<li>
 						{#if entry.kind === 'EVENT'}
 							{#if entry.type === 'HISTORICAL'}
-								<WorldBand entry={entry} canWrite={canWrite} />
+								<WorldBand entry={entry} />
 							{:else}
-								<EventPill entry={entry} canWrite={canWrite} />
+								<EventPill entry={entry} />
 							{/if}
 						{:else}
 							<LetterCard entry={entry} />

frontend/src/lib/timeline/TimelineView.svelte.spec.ts

@@ -105,7 +105,6 @@ describe('TimelineView', () => {
 
 	it('renders an undated curated EVENT as a pill, not a broken letter card (REQ-008/016)', () => {
 		render(TimelineView, {
-			canWrite: true,
 			timeline: makeTimelineDTO({
 				undated: [
 					makeEntry({
@@ -126,8 +125,8 @@ describe('TimelineView', () => {
 		// The event renders inside the undated section…
 		expect(document.querySelector('[data-testid="undated-section"]')).not.toBeNull();
 		expect(document.body.textContent).toContain('Auswanderung');
-		// …as an EventPill (its edit affordance, threaded canWrite), never as a
+		// …as an EventPill (its edit affordance), never as a letter card linking
-		// letter card linking to /documents/undefined with "Unbekannt → Unbekannt".
+		// to /documents/undefined with "Unbekannt → Unbekannt".
 		expect(document.querySelector('[data-testid="event-edit"]')).not.toBeNull();
 		expect(document.querySelector('a[href="/documents/undefined"]')).toBeNull();
 		expect(document.body.textContent).not.toContain('Unbekannt');
@@ -277,131 +276,4 @@ describe('TimelineView', () => {
 		);
 		expect(sides).toEqual(['left', 'right', 'left', 'right']);
 	});
-
-	// A curated PERSONAL event reachable through both dispatch paths: the year-band
-	// path (TimelineView → YearBand → EventPill) and the undated bucket
-	// (TimelineView → EventPill). canWrite must thread to both (REQ-009).
-	const curated = (eventId: string, title: string) =>
-		makeEntry({
-			kind: 'EVENT',
-			type: 'PERSONAL',
-			derived: false,
-			eventId,
-			title,
-			senderName: '',
-			receiverName: '',
-			documentId: undefined
-		});
-
-	const bothPaths = () =>
-		makeTimelineDTO({
-			years: [makeYear(1924, [curated('banded', 'Umzug nach Berlin')])],
-			undated: [curated('undated', 'Auswanderung')]
-		});
-
-	it('threads canWrite to a curated event in both a year band and the undated bucket (REQ-009)', () => {
-		render(TimelineView, { canWrite: true, timeline: bothPaths() });
-		const hrefs = Array.from(document.querySelectorAll('[data-testid="event-edit"]')).map((a) =>
-			a.getAttribute('href')
-		);
-		expect(hrefs).toContain('/zeitstrahl/events/banded/edit');
-		expect(hrefs).toContain('/zeitstrahl/events/undated/edit');
-	});
-
-	it('renders no edit links in either path when canWrite is false (REQ-007/009)', () => {
-		render(TimelineView, { canWrite: false, timeline: bothPaths() });
-		expect(document.querySelectorAll('[data-testid="event-edit"]')).toHaveLength(0);
-	});
-
-	it('threads canWrite to a curated HISTORICAL world band in both paths (REQ-006/009)', () => {
-		const world = (eventId: string, title: string) =>
-			makeEntry({
-				kind: 'EVENT',
-				type: 'HISTORICAL',
-				derived: false,
-				eventId,
-				precision: 'YEAR',
-				eventDate: '1929-01-01',
-				eventDateEnd: undefined,
-				title,
-				senderName: '',
-				receiverName: '',
-				documentId: undefined
-			});
-		render(TimelineView, {
-			canWrite: true,
-			timeline: makeTimelineDTO({
-				years: [makeYear(1929, [world('wb', 'Weltwirtschaftskrise')])],
-				undated: [world('wu', 'Unbekanntes Weltereignis')]
-			})
-		});
-		const hrefs = Array.from(document.querySelectorAll('[data-testid="event-edit"]')).map((a) =>
-			a.getAttribute('href')
-		);
-		expect(hrefs).toContain('/zeitstrahl/events/wb/edit');
-		expect(hrefs).toContain('/zeitstrahl/events/wu/edit');
-	});
-
-	it('builds the event lookup and clusters a curated event + same-year linked letter into an event-card (#850)', () => {
-		const evId = 'eeeeeeee-eeee-eeee-eeee-eeeeeeeeeeee';
-		const event = makeEntry({
-			kind: 'EVENT',
-			type: 'PERSONAL',
-			derived: false,
-			eventId: evId,
-			eventDate: '1916-07-06',
-			precision: 'DAY',
-			title: 'Ein gewaltiger Stadtbrand',
-			senderName: '',
-			receiverName: '',
-			documentId: undefined
-		});
-		const letter = makeEntry({
-			eventDate: '1916-05-10',
-			documentId: 'doc-linked',
-			title: 'Brief',
-			linkedEventId: evId
-		});
-		render(TimelineView, {
-			timeline: makeTimelineDTO({ years: [makeYear(1916, [event, letter])] })
-		});
-		expect(document.querySelector('[data-testid="event-card"]')).not.toBeNull();
-		expect(document.querySelector('a.lcard.ev')).not.toBeNull();
-		// the title reads once — the event is the card header, not also a loose pill
-		const titles = (document.body.textContent?.match(/Ein gewaltiger Stadtbrand/g) ?? []).length;
-		expect(titles).toBe(1);
-	});
-
-	it('keeps a HISTORICAL event a WorldBand with a same-year linked letter — never clusters (REQ-014)', () => {
-		const evId = 'dddddddd-dddd-dddd-dddd-dddddddddddd';
-		const world = makeEntry({
-			kind: 'EVENT',
-			type: 'HISTORICAL',
-			derived: false,
-			eventId: evId,
-			eventDate: '1916-07-01',
-			precision: 'DAY',
-			title: 'Schlacht an der Somme',
-			senderName: '',
-			receiverName: '',
-			documentId: undefined
-		});
-		const letter = makeEntry({
-			eventDate: '1916-05-10',
-			documentId: 'doc-world-linked',
-			title: 'Brief von der Front',
-			linkedEventId: evId
-		});
-		render(TimelineView, {
-			timeline: makeTimelineDTO({ years: [makeYear(1916, [world, letter])] })
-		});
-		// the world event stays a full-width band — no contained event card
-		expect(document.querySelector('[data-testid="event-card"]')).toBeNull();
-		expect(document.querySelector('a.lcard.ev')).toBeNull();
-		// the linked letter renders loose on the spine, not inside a card
-		expect(document.querySelector('.letter-row')).not.toBeNull();
-		// and the band keeps its WorldBand "· historisch" register
-		expect(document.body.textContent).toContain(m.timeline_layer_historical_suffix());
-		expect(document.body.textContent).toContain('Schlacht an der Somme');
-	});
 });

frontend/src/lib/timeline/WorldBand.svelte

@@ -1,6 +1,6 @@
 <script lang="ts">
 import * as m from '$lib/paraglide/messages.js';
-import { getAccentConfig, canEditEvent } from './eventCardConfig';
+import { getAccentConfig } from './eventCardConfig';
 import { timelineDateLabel } from './dateLabel';
 import type { components } from '$lib/generated/api';
 
@@ -11,11 +11,9 @@ type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
  * (REQ-009). A RANGE carries a visible span pill ("1914–1918") with a Zeitraum
  * aria-label; a RANGE with no end degrades to the start year, no pill (REQ-010).
  * The glyph is a redundant non-color cue with an sr-only label (REQ-018); text
- * uses text-ink-2 to stay AA in both themes (REQ-019). A curator (`canWrite`,
+ * uses text-ink-2 to stay AA in both themes (REQ-019).
- * gate-closed by default) gets an inline edit pencil for a curated event with an
- * eventId — #842 REQ-006/007/008; UX gate only, the #781 route guard is the boundary.
  */
-let { entry, canWrite = false }: { entry: TimelineEntryDTO; canWrite?: boolean } = $props();
+let { entry }: { entry: TimelineEntryDTO } = $props();
 
 const config = $derived(getAccentConfig(entry));
 const dateLabel = $derived(timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd));
@@ -26,9 +24,6 @@ const dateText = $derived(showSpan ? null : entry.precision === 'RANGE' ? fromYe
 // Every WorldBand is a HISTORICAL band, so the visible "historisch" register
 // always trails the subtitle as plain text — never a second pill (REQ-009).
 const historical = $derived(m.timeline_layer_historical_suffix());
-// A HISTORICAL event is never derived, so canEditEvent's derived check is a
-// no-op here — the gate is the curator flag plus a real eventId (#842 REQ-006/008).
-const canEdit = $derived(canEditEvent(entry, canWrite));
 </script>
 
 <div class="my-3 border-y border-line bg-canvas px-4 py-2 text-center">
@@ -51,14 +46,4 @@ const canEdit = $derived(canEditEvent(entry, canWrite));
 	<!-- Single trailing "· historisch" register, after the title and any
 	     span pill / date — one render site, consistent separator (REQ-009). -->
 	<span class="ml-2 font-sans text-xs text-ink-3">· {historical}</span>
-	{#if canEdit}
-		<a
-			data-testid="event-edit"
-			href="/zeitstrahl/events/{entry.eventId}/edit"
-			class="ml-2 rounded-sm px-1 font-sans text-xs text-ink-3 hover:text-brand-navy focus:outline-none focus-visible:ring-2 focus-visible:ring-brand-navy"
-		>
-			<span aria-hidden="true">✎</span>
-			<span class="sr-only">{m.btn_edit()}</span>
-		</a>
-	{/if}
 </div>

frontend/src/lib/timeline/WorldBand.svelte.spec.ts

@@ -73,35 +73,4 @@ describe('WorldBand', () => {
 		expect(pill?.textContent).not.toContain(m.timeline_layer_historical_suffix());
 		expect(document.body.textContent).toContain(m.timeline_layer_historical_suffix());
 	});
-
-	const HIST_EVENT_ID = '44444444-4444-4444-4444-444444444444';
-
-	it('shows an edit affordance for a curated HISTORICAL event when canWrite is true (REQ-006)', () => {
-		render(WorldBand, { canWrite: true, entry: historical({ eventId: HIST_EVENT_ID }) });
-		const edit = document.querySelector('[data-testid="event-edit"]') as HTMLAnchorElement | null;
-		expect(edit).not.toBeNull();
-		expect(edit?.getAttribute('href')).toBe(`/zeitstrahl/events/${HIST_EVENT_ID}/edit`);
-	});
-
-	it('mirrors the EventPill pencil: aria-hidden ✎ glyph + sr-only Bearbeiten label (REQ-006)', () => {
-		render(WorldBand, { canWrite: true, entry: historical({ eventId: HIST_EVENT_ID }) });
-		const edit = document.querySelector('[data-testid="event-edit"]');
-		expect(edit?.querySelector('[aria-hidden="true"]')?.textContent).toBe('✎');
-		expect(edit?.querySelector('.sr-only')?.textContent).toBe(m.btn_edit());
-	});
-
-	it('renders no edit affordance for a curated HISTORICAL event when canWrite is false (REQ-007)', () => {
-		render(WorldBand, { canWrite: false, entry: historical({ eventId: HIST_EVENT_ID }) });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('renders no edit affordance when the canWrite prop is omitted (gate-closed default) (REQ-007)', () => {
-		render(WorldBand, { entry: historical({ eventId: HIST_EVENT_ID }) });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-
-	it('shows no edit affordance when eventId is null even with canWrite (REQ-008)', () => {
-		render(WorldBand, { canWrite: true, entry: historical({ eventId: undefined }) });
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
 });

frontend/src/lib/timeline/YearBand.svelte

@@ -3,10 +3,8 @@ import EventPill from './EventPill.svelte';
 import WorldBand from './WorldBand.svelte';
 import LetterCard from './LetterCard.svelte';
 import YearLetterStrip from './YearLetterStrip.svelte';
-import EventCluster from './EventCluster.svelte';
 import { isDense } from './timelineDensity';
 import { entryKey } from './entryKey';
-import { splitYearLetters, type EventCluster as EventClusterModel } from './eventClustering';
 import type { components } from '$lib/generated/api';
 
 type TimelineYearDTO = components['schemas']['TimelineYearDTO'];
@@ -14,113 +12,37 @@ type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
 
 /**
  * One year of the timeline: a <section> with a sticky <h2> (REQ-006). Events
- * render in DTO order as pills/world-bands; entries are never re-sorted (REQ-003).
+ * render in DTO order as pills/bands; letters render as individual cards while
- *
+ * the band holds ≤ 12 (REQ-011) or collapse to a single density strip above that
- * A curated event with letters linked to it (#850) becomes a contained event card:
+ * (REQ-012). Entries are never re-sorted — DTO order is preserved (REQ-003).
- * the event IS the card header and its linked letters sit inside (no separate pill —
- * REQ-002). A curated event with letters in another year band renders here as a
- * cross-year text-header card (REQ-004). An event with no linked letters stays a
- * plain pill/world-band (REQ-005).
- *
- * Every other letter (no linkedEventId, or linking to an event the #780 layer filter
- * removed) stays loose: alternating left/right while the band holds ≤ 12 such loose
- * letters (REQ-006), folding into a single month-density strip above that (REQ-007).
- * The loose-letter layout and the strip count ONLY these loose letters — clustered
- * letters never re-appear loose (REQ-007).
  */
-let {
+let { year }: { year: TimelineYearDTO } = $props();
-	year,
-	canWrite = false,
-	eventLookup
-}: {
-	year: TimelineYearDTO;
-	canWrite?: boolean;
-	eventLookup?: Map<string, string>;
-} = $props();
 
 type Row =
 	| { t: 'event'; entry: TimelineEntryDTO }
-	| { t: 'eventcard'; event?: TimelineEntryDTO; cluster: EventClusterModel }
 	| { t: 'letter'; entry: TimelineEntryDTO; side: 'left' | 'right' }
 	| { t: 'strip' };
 
-// Split this band's letters into event clusters and the loose remainder once; the loose
+const letters = $derived(year.entries.filter((e) => e.kind === 'LETTER'));
-// list alone drives the alternating layout and the density strip (REQ-007).
+const dense = $derived(isDense(letters.length));
-const split = $derived(
-	splitYearLetters(
-		year.entries.filter((e) => e.kind === 'LETTER'),
-		eventLookup
-	)
-);
-const loose = $derived(split.loose);
-const dense = $derived(isDense(loose.length));
-// Clusters keyed by eventId (built once in splitYearLetters): row assembly looks a letter's
-// disposition up in O(1) — `byEvent.has(linkedEventId)` — instead of scanning the loose array
-// per letter (was O(L²) on a dense band), and resolves an event's card with `byEvent.get`.
-const byEvent = $derived(split.byEvent);
-
-// Event ids that have a same-year EVENT entry in THIS band: those clusters render as that
-// event's header (at the EVENT position); every other cluster is cross-year (REQ-004/015).
-const sameYearEventIds = $derived.by<Record<string, true>>(() => {
-	const ids: Record<string, true> = {};
-	for (const entry of year.entries) {
-		if (entry.kind === 'EVENT' && entry.eventId) ids[entry.eventId] = true;
-	}
-	return ids;
-});
 
 const rows = $derived.by<Row[]>(() => {
 	const out: Row[] = [];
-	const emitted: Record<string, true> = {};
 	let stripInserted = false;
 	let letterIndex = 0;
-
 	for (const entry of year.entries) {
 		if (entry.kind === 'EVENT') {
-			// A curated event whose letters live in THIS band becomes the contained card's
+			out.push({ t: 'event', entry });
-			// header — its title reads once, no separate pill (REQ-002). Otherwise it stays a
+		} else if (!dense) {
-			// plain pill/world-band (REQ-005).
+			out.push({ t: 'letter', entry, side: letterIndex % 2 === 0 ? 'left' : 'right' });
-			const cluster = entry.eventId ? byEvent.get(entry.eventId) : undefined;
+			letterIndex += 1;
-			if (cluster) {
+		} else if (!stripInserted) {
-				out.push({ t: 'eventcard', event: entry, cluster });
+			out.push({ t: 'strip' });
-				emitted[cluster.eventId] = true;
+			stripInserted = true;
-			} else {
-				out.push({ t: 'event', entry });
-			}
-			continue;
-		}
-
-		const cluster = entry.linkedEventId ? byEvent.get(entry.linkedEventId) : undefined;
-		if (!cluster) {
-			// A loose letter (not clustered): alternate while sparse, or fold the whole loose set
-			// into one density strip (inserted once, at the first loose letter) when dense.
-			if (!dense) {
-				out.push({ t: 'letter', entry, side: letterIndex % 2 === 0 ? 'left' : 'right' });
-				letterIndex += 1;
-			} else if (!stripInserted) {
-				out.push({ t: 'strip' });
-				stripInserted = true;
-			}
-			continue;
-		}
-
-		// A clustered letter. A same-year cluster is emitted at its EVENT entry, so skip it here.
-		// A cross-year cluster has no EVENT anchor in this band — emit its ✉ card HERE, at the
-		// position of its earliest linked letter, so the band stays in strict time order (REQ-015).
-		if (!sameYearEventIds[cluster.eventId] && !emitted[cluster.eventId]) {
-			out.push({ t: 'eventcard', cluster });
-			emitted[cluster.eventId] = true;
 		}
 	}
-
 	return out;
 });
-
-function rowKey(row: Row): string {
-	if (row.t === 'strip') return `strip-${year.year}`;
-	if (row.t === 'eventcard') return `evcard:${row.cluster.eventId}`;
-	return entryKey(row.entry);
-}
 </script>
 
 <section class="py-2">
@@ -134,27 +56,20 @@ function rowKey(row: Row): string {
 	</h2>
 
 	<div class="mt-3 space-y-3">
-		{#each rows as row (rowKey(row))}
+		{#each rows as row (row.t === 'strip' ? `strip-${year.year}` : entryKey(row.entry))}
 			{#if row.t === 'event'}
 				{#if row.entry.type === 'HISTORICAL'}
-					<WorldBand entry={row.entry} canWrite={canWrite} />
+					<WorldBand entry={row.entry} />
 				{:else}
-					<EventPill entry={row.entry} canWrite={canWrite} />
+					<EventPill entry={row.entry} />
 				{/if}
-			{:else if row.t === 'eventcard'}
-				<EventCluster
-					letters={row.cluster.letters}
-					event={row.event}
-					title={row.cluster.title}
-					canWrite={canWrite}
-				/>
 			{:else if row.t === 'letter'}
 				<div class="letter-row" data-side={row.side}>
 					<span data-testid="letter-dot" class="letter-dot bg-surface" aria-hidden="true"></span>
 					<LetterCard entry={row.entry} />
 				</div>
 			{:else}
-				<YearLetterStrip letters={loose} year={year.year} />
+				<YearLetterStrip letters={letters} year={year.year} />
 			{/if}
 		{/each}
 	</div>

frontend/src/lib/timeline/YearBand.svelte.spec.ts

@@ -165,126 +165,3 @@ describe('YearBand', () => {
 		}
 	});
 });
-
-describe('YearBand — inline event clustering (#850)', () => {
-	const EV_ID = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
-
-	function curatedEvent(overrides = {}) {
-		return makeEntry({
-			kind: 'EVENT',
-			derived: false,
-			type: 'PERSONAL',
-			eventId: EV_ID,
-			eventDate: '1916-07-06',
-			precision: 'DAY',
-			title: 'Ein gewaltiger Stadtbrand',
-			senderName: '',
-			receiverName: '',
-			documentId: undefined,
-			...overrides
-		});
-	}
-
-	function linkedLetters(year: number, count: number, eventId = EV_ID) {
-		return Array.from({ length: count }, (_, i) =>
-			makeEntry({
-				eventDate: `${year}-05-10`,
-				documentId: `linked-${i}`,
-				title: `Brief ${i}`,
-				linkedEventId: eventId
-			})
-		);
-	}
-
-	const lookup = new Map([[EV_ID, 'Ein gewaltiger Stadtbrand']]);
-
-	it('renders a curated event with a same-year linked letter as one event-card, title once, no separate pill (REQ-002)', () => {
-		render(YearBand, {
-			year: makeYear(1916, [curatedEvent(), ...linkedLetters(1916, 1)]),
-			eventLookup: lookup
-		});
-		expect(document.querySelectorAll('[data-testid="event-card"]')).toHaveLength(1);
-		const titles = (document.body.textContent?.match(/Ein gewaltiger Stadtbrand/g) ?? []).length;
-		expect(titles).toBe(1);
-		// the letter is inside the card, not a loose .letter-row
-		expect(document.querySelector('a.lcard.ev')).not.toBeNull();
-		expect(document.querySelector('.letter-row')).toBeNull();
-		// no plain EventPill for it (the pill is the only floating .rounded-full wrapper)
-		expect(document.querySelector('.justify-center .rounded-full.border-brand-mint')).toBeNull();
-	});
-
-	it('renders a curated event with NO linked letters as a plain EventPill, no card (REQ-005)', () => {
-		render(YearBand, {
-			year: makeYear(1916, [curatedEvent()]),
-			eventLookup: lookup
-		});
-		expect(document.querySelector('[data-testid="event-card"]')).toBeNull();
-		// the curated EventPill is the bordered floating rounded-full wrapper
-		expect(
-			document.querySelector('.justify-center .rounded-full.border-brand-mint')
-		).not.toBeNull();
-		expect(document.body.textContent).toContain('Ein gewaltiger Stadtbrand');
-	});
-
-	it('renders loose (unlinked) letters in a sparse year as alternating .letter-row, no card (REQ-006)', () => {
-		const loose = manyLetters(1916, 3); // no linkedEventId
-		render(YearBand, { year: makeYear(1916, loose), eventLookup: lookup });
-		expect(document.querySelectorAll('.letter-row')).toHaveLength(3);
-		expect(document.querySelector('[data-testid="event-card"]')).toBeNull();
-	});
-
-	it('counts only loose letters in the density strip; event letters stay in the card (REQ-006/007)', () => {
-		// 15 loose letters fold into one strip; a 3-letter event card shows its 3.
-		const loose = manyLetters(1916, 15);
-		const year = makeYear(1916, [curatedEvent(), ...linkedLetters(1916, 3), ...loose]);
-		render(YearBand, { year, eventLookup: lookup });
-		// the event card holds 3 letters
-		expect(document.querySelectorAll('a.lcard.ev')).toHaveLength(3);
-		// the loose letters fold into exactly one density strip
-		const strips = document.querySelectorAll('[data-testid="strip-expand"]');
-		expect(strips).toHaveLength(1);
-		// the strip card's count text is 15 (the loose letters), not 18 (REQ-006/007)
-		const stripCard = strips[0].closest('.max-w-md') as HTMLElement;
-		expect(stripCard.textContent).toContain('15');
-		expect(stripCard.textContent).not.toContain('18');
-	});
-
-	it('renders a cross-year cluster (event not in this band) as a ✉ text-header card holding it (REQ-004)', () => {
-		// The event id is in eventLookup but no matching EVENT entry sits in this band.
-		render(YearBand, {
-			year: makeYear(1917, linkedLetters(1917, 2)),
-			eventLookup: lookup
-		});
-		const card = document.querySelector('[data-testid="event-card"]');
-		expect(card).not.toBeNull();
-		expect(document.body.textContent).toContain('✉');
-		expect(document.body.textContent).toContain('Ein gewaltiger Stadtbrand');
-		// cross-year card carries no edit link and no pill
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-		expect(document.querySelector('.justify-center .rounded-full.border-brand-mint')).toBeNull();
-	});
-
-	it('interleaves a cross-year card before a later-dated loose letter in the same band (REQ-015)', () => {
-		// Chronological band order (what the backend delivers): a February cross-year letter, then
-		// a November loose letter. The cross-year card must sit at its earliest letter's position —
-		// before the November loose letter — so the band still reads in strict time order.
-		const febLinked = makeEntry({
-			eventDate: '1917-02-10',
-			documentId: 'feb-linked',
-			title: 'Feldpostbrief',
-			linkedEventId: EV_ID
-		});
-		const novLoose = makeEntry({
-			eventDate: '1917-11-20',
-			documentId: 'nov-loose',
-			title: 'Brief im November'
-		});
-		render(YearBand, { year: makeYear(1917, [febLinked, novLoose]), eventLookup: lookup });
-		const card = document.querySelector('[data-testid="event-card"]') as HTMLElement;
-		const looseLink = document.querySelector('a[href="/documents/nov-loose"]') as HTMLElement;
-		expect(card).not.toBeNull();
-		expect(looseLink).not.toBeNull();
-		// the cross-year card precedes the later-dated loose letter in DOM order
-		expect(card.compareDocumentPosition(looseLink) & Node.DOCUMENT_POSITION_FOLLOWING).toBeTruthy();
-	});
-});

frontend/src/lib/timeline/eventCardConfig.spec.ts

@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { getAccentConfig, canEditEvent } from './eventCardConfig';
+import { getAccentConfig } from './eventCardConfig';
 import type { components } from '$lib/generated/api';
 
 type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
@@ -51,24 +51,3 @@ describe('getAccentConfig', () => {
 		expect(cfg.accent).toBe('curated');
 	});
 });
-
-// The single source of the curator edit-affordance gate (CLAUDE.md's TimelineEntryDTO contract):
-// a curated event shows its edit pencil only for a writer, never for a derived life-event or a
-// null eventId. Shared by EventPill, WorldBand, and EventCluster (#850 finding #5).
-describe('canEditEvent', () => {
-	it('allows a writer to edit a curated event with an eventId', () => {
-		expect(canEditEvent(event({ derived: false, eventId: 'e-1' }), true)).toBe(true);
-	});
-
-	it('denies a viewer without write permission', () => {
-		expect(canEditEvent(event({ derived: false, eventId: 'e-1' }), false)).toBe(false);
-	});
-
-	it('denies a derived life-event even for a writer', () => {
-		expect(canEditEvent(event({ derived: true, eventId: 'e-1' }), true)).toBe(false);
-	});
-
-	it('denies an event with no eventId even for a writer', () => {
-		expect(canEditEvent(event({ derived: false, eventId: undefined }), true)).toBe(false);
-	});
-});

frontend/src/lib/timeline/eventCardConfig.ts

@@ -36,16 +36,3 @@ export function getAccentConfig(entry: TimelineEntryDTO): AccentConfig {
 	}
 	return { glyph: '★', label: m.timeline_layer_family(), accent: 'curated' };
 }
-
-/**
- * The curator edit-affordance gate, in one place — the security-relevant contract documented on
- * CLAUDE.md's `TimelineEntryDTO` row (`derived || eventId == null` → no edit link). A curated
- * event's edit pencil shows only for a viewer with WRITE_ALL (`canWrite`), and only when it is a
- * real curated event: never a derived life-event (nothing to edit) and never a null `eventId`.
- * HISTORICAL events are never derived, so this also covers the world band. The gate is UX only —
- * the #781 route guard + backend permission are the real boundary. Shared by EventPill, WorldBand,
- * and EventCluster so the gate has a single source of truth (#850 finding #5).
- */
-export function canEditEvent(entry: TimelineEntryDTO, canWrite: boolean): boolean {
-	return canWrite && !entry.derived && entry.eventId != null;
-}

frontend/src/lib/timeline/eventClustering.spec.ts

@@ -1,141 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import { buildEventLookup, splitYearLetters, CLUSTER_PREVIEW } from './eventClustering';
-import { makeEntry } from './test-factories';
-import type { components } from '$lib/generated/api';
-
-type TimelineDTO = components['schemas']['TimelineDTO'];
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-const EV_A = 'aaaaaaaa-aaaa-aaaa-aaaa-aaaaaaaaaaaa';
-const EV_B = 'bbbbbbbb-bbbb-bbbb-bbbb-bbbbbbbbbbbb';
-
-const makeEvent = (overrides: Partial<TimelineEntryDTO> = {}): TimelineEntryDTO =>
-	makeEntry({ kind: 'EVENT', type: 'PERSONAL', documentId: undefined, ...overrides });
-
-describe('eventClustering — buildEventLookup', () => {
-	it('maps a curated year-band event to its title, excluding undated-bucket events (#7)', () => {
-		const timeline: TimelineDTO = {
-			years: [
-				{
-					year: 1916,
-					entries: [makeEvent({ eventId: EV_A, title: 'Ein gewaltiger Stadtbrand' })]
-				}
-			],
-			undated: [makeEvent({ eventId: EV_B, title: 'Briefe von der Front' })]
-		};
-		const lookup = buildEventLookup(timeline);
-		expect(lookup.get(EV_A)).toBe('Ein gewaltiger Stadtbrand');
-		// An undated event renders as a plain pill in the undated bucket — out of clustering
-		// scope. Including it here would scatter its dated letters into orphaned ✉ cross-year
-		// cards detached from the pill (#7), so it must NOT enter the lookup.
-		expect(lookup.has(EV_B)).toBe(false);
-		expect(lookup.size).toBe(1);
-	});
-
-	it('ignores derived events (no eventId) and letters', () => {
-		const timeline: TimelineDTO = {
-			years: [
-				{
-					year: 1916,
-					entries: [
-						makeEvent({ eventId: undefined, title: 'Geburt' }), // derived
-						makeEntry({ kind: 'LETTER', documentId: 'doc-1' })
-					]
-				}
-			],
-			undated: []
-		};
-		expect(buildEventLookup(timeline).size).toBe(0);
-	});
-
-	it('excludes a HISTORICAL event so its letters stay loose, keeping its WorldBand (REQ-014)', () => {
-		const timeline: TimelineDTO = {
-			years: [
-				{ year: 1916, entries: [makeEvent({ eventId: EV_A, type: 'HISTORICAL', title: 'Somme' })] }
-			],
-			undated: []
-		};
-		const lookup = buildEventLookup(timeline);
-		expect(lookup.has(EV_A)).toBe(false);
-		expect(lookup.size).toBe(0);
-	});
-
-	it('skips an event with an empty or whitespace title — no bare ✉ card (#8)', () => {
-		const timeline: TimelineDTO = {
-			years: [
-				{
-					year: 1916,
-					entries: [
-						makeEvent({ eventId: EV_A, title: '' }),
-						makeEvent({ eventId: EV_B, title: '   ' })
-					]
-				}
-			],
-			undated: []
-		};
-		expect(buildEventLookup(timeline).size).toBe(0);
-	});
-});
-
-describe('eventClustering — splitYearLetters', () => {
-	it('exposes a CLUSTER_PREVIEW of 5', () => {
-		expect(CLUSTER_PREVIEW).toBe(5);
-	});
-
-	it('clusters letters by linkedEventId with matching counts', () => {
-		const lookup = new Map([[EV_A, 'Stadtbrand']]);
-		const letters = [
-			makeEntry({ kind: 'LETTER', documentId: 'd1', linkedEventId: EV_A }),
-			makeEntry({ kind: 'LETTER', documentId: 'd2', linkedEventId: EV_A })
-		];
-		const { clusters, loose } = splitYearLetters(letters, lookup);
-		expect(clusters).toHaveLength(1);
-		expect(clusters[0].eventId).toBe(EV_A);
-		expect(clusters[0].title).toBe('Stadtbrand');
-		expect(clusters[0].letters).toHaveLength(2);
-		expect(loose).toHaveLength(0);
-	});
-
-	it('keeps a letter with no linkedEventId loose', () => {
-		const lookup = new Map([[EV_A, 'Stadtbrand']]);
-		const letters = [makeEntry({ kind: 'LETTER', documentId: 'd1', linkedEventId: undefined })];
-		const { clusters, loose } = splitYearLetters(letters, lookup);
-		expect(clusters).toHaveLength(0);
-		expect(loose).toHaveLength(1);
-	});
-
-	it('keeps a letter whose linkedEventId is absent from the lookup loose (filter-then-cluster, REQ-008)', () => {
-		const lookup = new Map([[EV_A, 'Stadtbrand']]);
-		const letters = [makeEntry({ kind: 'LETTER', documentId: 'd1', linkedEventId: EV_B })];
-		const { clusters, loose } = splitYearLetters(letters, lookup);
-		expect(clusters).toHaveLength(0);
-		expect(loose).toHaveLength(1);
-	});
-
-	it('places each letter in exactly one place (REQ-007)', () => {
-		const lookup = new Map([[EV_A, 'Stadtbrand']]);
-		const letters = [
-			makeEntry({ kind: 'LETTER', documentId: 'd1', linkedEventId: EV_A }),
-			makeEntry({ kind: 'LETTER', documentId: 'd2', linkedEventId: undefined }),
-			makeEntry({ kind: 'LETTER', documentId: 'd3', linkedEventId: EV_B })
-		];
-		const { clusters, loose } = splitYearLetters(letters, lookup);
-		const clustered = clusters.flatMap((c) => c.letters.length).reduce((a, b) => a + b, 0);
-		expect(clustered + loose.length).toBe(3);
-		expect(clustered).toBe(1);
-		expect(loose).toHaveLength(2);
-	});
-
-	it('keeps clusters in first-seen order', () => {
-		const lookup = new Map([
-			[EV_B, 'Front'],
-			[EV_A, 'Stadtbrand']
-		]);
-		const letters = [
-			makeEntry({ kind: 'LETTER', documentId: 'd1', linkedEventId: EV_A }),
-			makeEntry({ kind: 'LETTER', documentId: 'd2', linkedEventId: EV_B })
-		];
-		const { clusters } = splitYearLetters(letters, lookup);
-		expect(clusters.map((c) => c.eventId)).toEqual([EV_A, EV_B]);
-	});
-});

frontend/src/lib/timeline/eventClustering.ts

@@ -1,88 +0,0 @@
-import type { components } from '$lib/generated/api';
-
-type TimelineDTO = components['schemas']['TimelineDTO'];
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-/** Letters shown inside an event card before a "show more" toggle appears (#850, REQ-003). */
-export const CLUSTER_PREVIEW = 5;
-
-/** One contained event card's worth of letters within a year band (#850). */
-export interface EventCluster {
-	/** The curated event's id — also the `{#each}` key. */
-	eventId: string;
-	/** The curated event's title (from the event lookup). */
-	title: string;
-	letters: TimelineEntryDTO[];
-}
-
-/** The result of splitting a year's letters into event clusters and the loose remainder. */
-export interface SplitLetters {
-	clusters: EventCluster[];
-	loose: TimelineEntryDTO[];
-	/** Clusters keyed by `eventId` for O(1) lookup during row assembly (a letter's disposition is
-	 *  `byEvent.has(linkedEventId)`; an event's card is `byEvent.get(eventId)`). */
-	byEvent: Map<string, EventCluster>;
-}
-
-/**
- * Maps each curated event present in the (already layer-filtered) timeline to its title. These
- * are the only events a letter may cluster under — a letter whose `linkedEventId` is absent here
- * links to an event the #780 layer filter removed, so it falls back to a loose chronological
- * letter (filter-then-cluster, REQ-008). Curated PERSONAL events carry an `eventId`; derived
- * life-events and letters do not, so they never enter the lookup. HISTORICAL events are excluded
- * too: a world event always keeps its full-width WorldBand and never clusters, even with linked
- * letters (REQ-014) — those letters stay loose.
- *
- * Only year-band events are collected: an undated event renders as a plain pill in the undated
- * bucket (out of clustering scope), so including it would scatter its dated letters into orphaned
- * cross-year cards detached from that pill (#7).
- *
- * An event with an empty/whitespace title is skipped too — clustering under it would render a
- * label-less `✉` mystery card; its letters stay loose instead (#8).
- */
-export function buildEventLookup(timeline: TimelineDTO): Map<string, string> {
-	const lookup = new Map<string, string>();
-	const collect = (entries: TimelineEntryDTO[]) => {
-		for (const entry of entries) {
-			const title = entry.title?.trim();
-			if (entry.kind === 'EVENT' && entry.eventId && entry.type !== 'HISTORICAL' && title) {
-				lookup.set(entry.eventId, title);
-			}
-		}
-	};
-	for (const band of timeline.years) collect(band.entries);
-	return lookup;
-}
-
-/**
- * Splits one year's `LETTER` entries into event clusters and the loose remainder. A letter joins
- * the cluster keyed by its `linkedEventId` IFF that id is set AND present in `eventLookup`
- * (filter-then-cluster, REQ-007/008); every other letter is loose and stays in the chronological
- * flow (REQ-006). Clusters keep first-seen order; each letter appears in exactly one place.
- */
-export function splitYearLetters(
-	letters: TimelineEntryDTO[],
-	eventLookup?: Map<string, string>
-): SplitLetters {
-	const byEvent = new Map<string, EventCluster>();
-	const clusters: EventCluster[] = [];
-	const loose: TimelineEntryDTO[] = [];
-
-	for (const letter of letters) {
-		const eventId = letter.linkedEventId;
-		const title = eventId != null ? eventLookup?.get(eventId) : undefined;
-		if (eventId != null && title !== undefined) {
-			let cluster = byEvent.get(eventId);
-			if (!cluster) {
-				cluster = { eventId, title, letters: [] };
-				byEvent.set(eventId, cluster);
-				clusters.push(cluster);
-			}
-			cluster.letters.push(letter);
-		} else {
-			loose.push(letter);
-		}
-	}
-
-	return { clusters, loose, byEvent };
-}

frontend/src/lib/timeline/timeline-no-raw-html.spec.ts

@@ -1,24 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import { readdirSync, readFileSync } from 'node:fs';
-import { fileURLToPath } from 'node:url';
-import { dirname, join } from 'node:path';
-
-const timelineDir = dirname(fileURLToPath(import.meta.url));
-
-/**
- * REQ-010 / CWE-79: inline event clustering renders curator event titles and import-derived
- * letter titles + sender/receiver text through every component under lib/timeline (the reused
- * LetterCard, the new EventCluster card, the existing pills/bands/strip). That text must always
- * render through Svelte's default `{...}` escaping — never `{@html}`. This grep gate fails loudly
- * the moment any timeline component reaches for the raw-HTML directive.
- */
-describe('lib/timeline never uses {@html} (REQ-010)', () => {
-	it('no timeline component contains the raw-HTML directive', () => {
-		const components = readdirSync(timelineDir).filter((file) => file.endsWith('.svelte'));
-		expect(components.length).toBeGreaterThan(0);
-		const offenders = components.filter((file) =>
-			readFileSync(join(timelineDir, file), 'utf8').includes('{@html')
-		);
-		expect(offenders).toEqual([]);
-	});
-});

frontend/src/lib/timeline/timelineFilter.spec.ts

@@ -1,151 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import {
-	isDefaultState,
-	hiddenLayerCount,
-	filterTimeline,
-	ALL_LAYERS_ON,
-	type TimelineLayerFilters
-} from './timelineFilter';
-import { makeEntry, makeYear, makeTimelineDTO } from './test-factories';
-
-// Entry factories pinned to the three layers the filter discriminates (#780).
-const letter = (overrides = {}) => makeEntry({ kind: 'LETTER', ...overrides });
-
-const curatedPersonal = (overrides = {}) =>
-	makeEntry({
-		kind: 'EVENT',
-		type: 'PERSONAL',
-		derived: false,
-		documentId: undefined,
-		title: 'Umzug nach Berlin',
-		senderName: '',
-		receiverName: '',
-		...overrides
-	});
-
-// Derived life-events carry type=PERSONAL (issue #776 REQ-009) — they belong to
-// the Personal layer, not a fourth one.
-const derivedLifeEvent = (overrides = {}) =>
-	makeEntry({
-		kind: 'EVENT',
-		type: 'PERSONAL',
-		derived: true,
-		derivedType: 'BIRTH',
-		documentId: undefined,
-		title: 'Geburt',
-		senderName: '',
-		receiverName: '',
-		...overrides
-	});
-
-const historical = (overrides = {}) =>
-	makeEntry({
-		kind: 'EVENT',
-		type: 'HISTORICAL',
-		derived: false,
-		documentId: undefined,
-		title: 'Erster Weltkrieg',
-		senderName: '',
-		receiverName: '',
-		...overrides
-	});
-
-const off = (overrides: Partial<TimelineLayerFilters>): TimelineLayerFilters => ({
-	...ALL_LAYERS_ON,
-	...overrides
-});
-
-describe('isDefaultState (REQ-007)', () => {
-	it('is true when all three layers are on', () => {
-		expect(isDefaultState(ALL_LAYERS_ON)).toBe(true);
-	});
-
-	it('is false when any single layer is off', () => {
-		expect(isDefaultState(off({ personalOn: false }))).toBe(false);
-		expect(isDefaultState(off({ historicalOn: false }))).toBe(false);
-		expect(isDefaultState(off({ lettersOn: false }))).toBe(false);
-	});
-});
-
-describe('hiddenLayerCount (REQ-007)', () => {
-	it('is 0 in the default all-on state', () => {
-		expect(hiddenLayerCount(ALL_LAYERS_ON)).toBe(0);
-	});
-
-	it('counts each layer that is off', () => {
-		expect(hiddenLayerCount(off({ lettersOn: false }))).toBe(1);
-		expect(hiddenLayerCount(off({ personalOn: false, historicalOn: false }))).toBe(2);
-		expect(hiddenLayerCount({ personalOn: false, historicalOn: false, lettersOn: false })).toBe(3);
-	});
-});
-
-describe('filterTimeline', () => {
-	it('returns every entry unchanged in the default all-on state', () => {
-		const dto = makeTimelineDTO({
-			years: [makeYear(1915, [letter(), historical(), curatedPersonal()])],
-			undated: [letter({ documentId: 'u1' })]
-		});
-		const result = filterTimeline(dto, ALL_LAYERS_ON);
-		expect(result.years[0].entries).toHaveLength(3);
-		expect(result.undated).toHaveLength(1);
-	});
-
-	it('hides LETTER entries when lettersOn is false, keeping events (REQ-005)', () => {
-		const dto = makeTimelineDTO({
-			years: [makeYear(1915, [letter(), historical(), curatedPersonal()])],
-			undated: [letter({ documentId: 'u1' })]
-		});
-		const result = filterTimeline(dto, off({ lettersOn: false }));
-		expect(result.years[0].entries.every((e) => e.kind !== 'LETTER')).toBe(true);
-		expect(result.years[0].entries).toHaveLength(2);
-		expect(result.undated).toHaveLength(0);
-	});
-
-	it('hides HISTORICAL events when historicalOn is false, keeping personal + letters (REQ-004)', () => {
-		const dto = makeTimelineDTO({
-			years: [makeYear(1915, [letter(), historical(), curatedPersonal(), derivedLifeEvent()])]
-		});
-		const result = filterTimeline(dto, off({ historicalOn: false }));
-		const kept = result.years[0].entries;
-		expect(kept.some((e) => e.kind === 'EVENT' && e.type === 'HISTORICAL')).toBe(false);
-		expect(kept.some((e) => e.kind === 'LETTER')).toBe(true);
-		expect(kept.some((e) => e.kind === 'EVENT' && e.type === 'PERSONAL')).toBe(true);
-		expect(kept).toHaveLength(3);
-	});
-
-	it('hides personal events — curated and derived — when personalOn is false (REQ-003)', () => {
-		const dto = makeTimelineDTO({
-			years: [makeYear(1915, [letter(), historical(), curatedPersonal(), derivedLifeEvent()])]
-		});
-		const result = filterTimeline(dto, off({ personalOn: false }));
-		const kept = result.years[0].entries;
-		// neither the curated PERSONAL event nor the derived life-event survives
-		expect(kept.some((e) => e.kind === 'EVENT' && e.type === 'PERSONAL')).toBe(false);
-		expect(kept.some((e) => e.derived)).toBe(false);
-		// historical events and letters are untouched
-		expect(kept.some((e) => e.kind === 'EVENT' && e.type === 'HISTORICAL')).toBe(true);
-		expect(kept.some((e) => e.kind === 'LETTER')).toBe(true);
-		expect(kept).toHaveLength(2);
-	});
-
-	it('drops year bands that become empty and filters the undated bucket (REQ-006)', () => {
-		const dto = makeTimelineDTO({
-			years: [
-				makeYear(1915, [letter()]), // becomes empty when letters are hidden
-				makeYear(1918, [historical()]) // survives
-			],
-			undated: [letter({ documentId: 'u1' }), historical({ documentId: undefined })]
-		});
-		const result = filterTimeline(dto, off({ lettersOn: false }));
-		expect(result.years).toHaveLength(1);
-		expect(result.years[0].year).toBe(1918);
-		expect(result.undated.every((e) => e.kind !== 'LETTER')).toBe(true);
-		expect(result.undated).toHaveLength(1);
-	});
-
-	it('does not mutate the input timeline', () => {
-		const dto = makeTimelineDTO({ years: [makeYear(1915, [letter(), historical()])] });
-		filterTimeline(dto, off({ lettersOn: false }));
-		expect(dto.years[0].entries).toHaveLength(2);
-	});
-});

frontend/src/lib/timeline/timelineFilter.ts

@@ -1,63 +0,0 @@
-import type { components } from '$lib/generated/api';
-
-type TimelineDTO = components['schemas']['TimelineDTO'];
-type TimelineEntryDTO = components['schemas']['TimelineEntryDTO'];
-
-/**
- * The three visibility layers a reader can toggle on the global `/zeitstrahl`
- * (#780). Purely a presentation concern — the whole timeline is loaded once by
- * #779; these toggles derive a client-side filtered view of it.
- */
-export interface TimelineLayerFilters {
-	/** Personal events — curated `PERSONAL` events and derived life-events. */
-	personalOn: boolean;
-	/** Historical events (`type === 'HISTORICAL'`). */
-	historicalOn: boolean;
-	/** Letters (`kind === 'LETTER'`). */
-	lettersOn: boolean;
-}
-
-/** The default view: every layer visible. */
-export const ALL_LAYERS_ON: TimelineLayerFilters = {
-	personalOn: true,
-	historicalOn: true,
-	lettersOn: true
-};
-
-/** True when no layer is hidden — the default, all-on state (REQ-007). */
-export function isDefaultState(filters: TimelineLayerFilters): boolean {
-	return filters.personalOn && filters.historicalOn && filters.lettersOn;
-}
-
-/** How many layers are currently hidden — the "N active" trigger count (REQ-007). */
-export function hiddenLayerCount(filters: TimelineLayerFilters): number {
-	return (
-		(filters.personalOn ? 0 : 1) + (filters.historicalOn ? 0 : 1) + (filters.lettersOn ? 0 : 1)
-	);
-}
-
-/**
- * Decides whether one entry survives the active layer toggles. A letter rides
- * the Letters layer; a historical event the Historical layer; everything else
- * (curated `PERSONAL` events and derived life-events, which also carry
- * `type === 'PERSONAL'`) the Personal layer.
- */
-function isVisible(entry: TimelineEntryDTO, filters: TimelineLayerFilters): boolean {
-	if (entry.kind === 'LETTER') return filters.lettersOn;
-	if (entry.type === 'HISTORICAL') return filters.historicalOn;
-	return filters.personalOn;
-}
-
-/**
- * Derives a client-side filtered copy of the timeline (REQ-003/004/005/006).
- * Year bands left empty by the active toggles are dropped so `TimelineView`
- * never renders a hollow band, and the undated bucket is filtered the same way.
- * Pure — the input DTO is never mutated.
- */
-export function filterTimeline(timeline: TimelineDTO, filters: TimelineLayerFilters): TimelineDTO {
-	const years = timeline.years
-		.map((band) => ({ ...band, entries: band.entries.filter((e) => isVisible(e, filters)) }))
-		.filter((band) => band.entries.length > 0);
-	const undated = timeline.undated.filter((e) => isVisible(e, filters));
-	return { years, undated };
-}

frontend/src/lib/timeline/timelineFilterBoundary.spec.ts

@@ -1,37 +0,0 @@
-import { describe, it, expect } from 'vitest';
-import { readFileSync } from 'node:fs';
-import { fileURLToPath } from 'node:url';
-
-// REQ-001/002: the layer filter is presentation-only and fully client-side. It
-// must never navigate or fetch — the route derives the filtered view from
-// already-loaded data. This static guard mirrors the project's existing
-// grep-gates (e.g. the no-`{@html}` checks) and fails the build if a future
-// edit reintroduces navigation or a network call into either file.
-const read = (relative: string) =>
-	readFileSync(fileURLToPath(new URL(relative, import.meta.url)), 'utf8');
-
-const FILES = {
-	'TimelineFilters.svelte': read('./TimelineFilters.svelte'),
-	'/zeitstrahl/+page.svelte': read('../../routes/zeitstrahl/+page.svelte')
-};
-
-const FORBIDDEN: { label: string; pattern: RegExp }[] = [
-	{ label: 'goto(', pattern: /\bgoto\s*\(/ },
-	{ label: 'url.searchParams', pattern: /url\.searchParams/ },
-	{ label: 'api.GET', pattern: /\bapi\.GET\b/ },
-	{ label: 'fetch(', pattern: /\bfetch\s*\(/ }
-];
-
-describe('layer-filter boundary (REQ-001/002)', () => {
-	for (const [name, source] of Object.entries(FILES)) {
-		it(`${name} was found and is non-empty`, () => {
-			expect(source.length).toBeGreaterThan(0);
-		});
-
-		for (const { label, pattern } of FORBIDDEN) {
-			it(`${name} contains no ${label}`, () => {
-				expect(pattern.test(source), `${name} must not use ${label}`).toBe(false);
-			});
-		}
-	}
-});

frontend/src/routes/persons/[id]/PersonCard.svelte

@@ -128,8 +128,7 @@ const deathText = $derived(formatLifeDate(person.deathDate, person.deathDatePrec
 			</div>
 		{/if}
 
-		<!-- Curator actions — full width, outlined. Both links are gated to
+		<!-- Edit button — full width, outlined -->
-		     WRITE_ALL; the gate is UX only (the #781 route guard is the boundary). -->
 		{#if canWrite}
 			<a
 				href="/persons/{person.id}/edit"
@@ -143,15 +142,6 @@ const deathText = $derived(formatLifeDate(person.deathDate, person.deathDatePrec
 				/>
 				{m.btn_edit()}
 			</a>
-			<!-- Opens #781's create form pre-seeded with this person; on save it
-			     returns to /persons/{id} (originPersonId). #842 REQ-003/010. -->
-			<a
-				data-testid="person-add-event"
-				href="/zeitstrahl/events/new?personId={person.id}"
-				class="mt-2 flex min-h-[44px] w-full items-center justify-center rounded border border-line px-3 py-2 font-sans text-xs font-bold tracking-widest text-ink-2 uppercase transition-colors hover:border-primary hover:text-ink"
-			>
-				{m.person_add_event()}
-			</a>
 		{/if}
 	</div>
 </div>

frontend/src/routes/persons/[id]/PersonCard.svelte.spec.ts

@@ -1,32 +0,0 @@
-import { describe, it, expect, afterEach } from 'vitest';
-import { cleanup, render } from 'vitest-browser-svelte';
-import PersonCard from './PersonCard.svelte';
-
-afterEach(() => cleanup());
-
-const PERSON_ID = '55555555-5555-5555-5555-555555555555';
-
-const makePerson = (overrides = {}) => ({
-	id: PERSON_ID,
-	firstName: 'Karl',
-	lastName: 'Raddatz',
-	displayName: 'Karl Raddatz',
-	personType: 'PERSON',
-	...overrides
-});
-
-describe('PersonCard add-event affordance (#842)', () => {
-	it('shows an add-event link pre-seeded with the person to a curator (REQ-003)', () => {
-		render(PersonCard, { person: makePerson(), canWrite: true });
-		const add = document.querySelector(
-			'[data-testid="person-add-event"]'
-		) as HTMLAnchorElement | null;
-		expect(add).not.toBeNull();
-		expect(add?.getAttribute('href')).toBe(`/zeitstrahl/events/new?personId=${PERSON_ID}`);
-	});
-
-	it('renders no add-event link to a reader (REQ-004)', () => {
-		render(PersonCard, { person: makePerson(), canWrite: false });
-		expect(document.querySelector('[data-testid="person-add-event"]')).toBeNull();
-	});
-});

frontend/src/routes/zeitstrahl/+page.svelte

@@ -1,40 +1,14 @@
 <script lang="ts">
 import * as m from '$lib/paraglide/messages.js';
 import TimelineView from '$lib/timeline/TimelineView.svelte';
-import TimelineFilters from '$lib/timeline/TimelineFilters.svelte';
 import { timelineMeta } from '$lib/timeline/timelineMeta';
-import { filterTimeline } from '$lib/timeline/timelineFilter';
 import type { PageData } from './$types';
 
 let { data }: { data: PageData } = $props();
 
+const meta = $derived(timelineMeta(data.timeline));
 const hasContent = $derived(data.timeline.years.length > 0 || data.timeline.undated.length > 0);
 
-// Layer-filter state (#780). Layer hiding is client-side only — the whole
-// timeline is loaded once by #779's SSR load and we derive a filtered view of
-// it here; there is no goto, no URL param, and no extra fetch.
-let personalOn = $state(true);
-let historicalOn = $state(true);
-let lettersOn = $state(true);
-
-const filteredTimeline = $derived(
-	filterTimeline(data.timeline, { personalOn, historicalOn, lettersOn })
-);
-const filteredEmpty = $derived(
-	filteredTimeline.years.length === 0 && filteredTimeline.undated.length === 0
-);
-
-// Meta-line figures track the *filtered* view, so the header counts always
-// match what is actually on screen once layers are toggled off (#780 — this
-// closes the prior D1 limitation, where the counts stayed on the full timeline).
-const meta = $derived(timelineMeta(filteredTimeline));
-
-function resetFilters() {
-	personalOn = true;
-	historicalOn = true;
-	lettersOn = true;
-}
-
 // Compose the sub-line from segments joined by " · " so the range drops out
 // cleanly when there are no year bands; the whole line is absent when the
 // timeline is empty (REQ-002). Counts come from the route alone, never from
@@ -60,7 +34,7 @@ const metaLine = $derived.by(() => {
 				: m.timeline_events_count({ count: meta.eventCount })
 		);
 	}
-	// REQ-011: the toggle-free chronological view carries no grouping segment.
+	segments.push(m.timeline_grouping_date());
 	return segments.join(' · ');
 });
 </script>
@@ -74,45 +48,10 @@ const metaLine = $derived.by(() => {
 	     border is intentionally omitted (the page is already bg-canvas), per the
 	     review of REQ-001 — the sheet reads through its padding, not a frame line. -->
 	<div data-testid="timeline-canvas" class="rounded-[10px] bg-canvas p-6">
-		<!-- Wrapping header so the CTA drops below the heading at narrow widths
+		<h1 class="font-serif text-2xl font-bold text-brand-navy">{m.timeline_heading()}</h1>
-		     (≤360px) instead of overflowing — #842 REQ-001. -->
-		<header class="flex flex-wrap items-center justify-between gap-3">
-			<h1 class="font-serif text-2xl font-bold text-brand-navy">{m.timeline_heading()}</h1>
-			{#if data.canWrite}
-				<a
-					data-testid="timeline-add-event"
-					href="/zeitstrahl/events/new"
-					class="inline-flex h-11 items-center rounded bg-primary px-4 font-sans text-sm font-medium text-primary-fg hover:opacity-90 focus:outline-none focus-visible:ring-2 focus-visible:ring-focus-ring"
-				>
-					{m.timeline_add_event()}
-				</a>
-			{/if}
-		</header>
 		{#if hasContent}
 			<p data-testid="timeline-meta" class="mt-1 mb-6 font-sans text-xs text-ink-3">{metaLine}</p>
-			<TimelineFilters
-				bind:personalOn={personalOn}
-				bind:historicalOn={historicalOn}
-				bind:lettersOn={lettersOn}
-			/>
-		{/if}
-		{#if hasContent && filteredEmpty}
-			<!-- Filtered-empty: a calm message + one-click reset below the still-open
-			     filter bar — never a blank page, and never the generic "no events"
-			     state (which would imply the archive itself is empty). REQ-006. -->
-			<div data-testid="timeline-filter-empty" class="py-12 text-center">
-				<p class="font-serif text-base text-ink-2">{m.timeline_filter_empty_state()}</p>
-				<button
-					type="button"
-					data-testid="timeline-filter-empty-reset"
-					onclick={resetFilters}
-					class="mt-3 inline-flex min-h-[44px] items-center font-sans text-sm text-primary underline-offset-2 hover:underline"
-				>
-					{m.timeline_filter_reset()}
-				</button>
-			</div>
-		{:else}
-			<TimelineView timeline={filteredTimeline} canWrite={data.canWrite} />
 		{/if}
+		<TimelineView timeline={data.timeline} />
 	</div>
 </div>

frontend/src/routes/zeitstrahl/page.svelte.spec.ts

@@ -1,6 +1,5 @@
 import { describe, it, expect, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
-import { page } from 'vitest/browser';
 import * as m from '$lib/paraglide/messages.js';
 import Page from './+page.svelte';
 import { makeEntry, makeYear, makeTimelineDTO } from '$lib/timeline/test-factories';
@@ -43,7 +42,7 @@ describe('/zeitstrahl page', () => {
 		expect(canvas?.querySelector('ol')).not.toBeNull();
 	});
 
-	it('renders the meta sub-line with range and counts, no grouping segment (REQ-011)', () => {
+	it('renders the meta sub-line with range, counts, and grouping (REQ-002)', () => {
 		const dto = makeTimelineDTO({
 			years: [
 				makeYear(1909, [
@@ -59,8 +58,7 @@ describe('/zeitstrahl page', () => {
 		expect(sub?.textContent).toContain('1909–1924');
 		expect(sub?.textContent).toContain(m.timeline_letters_count({ count: 3 }));
 		expect(sub?.textContent).toContain(m.timeline_events_count({ count: 2 }));
-		// REQ-011: the toggle-free view drops the grouping meta segment.
+		expect(sub?.textContent).toContain(m.timeline_grouping_date());
-		expect(sub?.textContent).not.toContain('Gruppierung');
 	});
 
 	it('omits the range segment when there are no year bands (REQ-002)', () => {
@@ -85,7 +83,7 @@ describe('/zeitstrahl page', () => {
 		const sub = document.querySelector('[data-testid="timeline-meta"]');
 		expect(sub).not.toBeNull();
 		expect(sub?.textContent).not.toContain(m.timeline_letters_count({ count: 0 }));
-		expect(sub?.textContent).not.toContain('Gruppierung');
+		expect(sub?.textContent).toContain(m.timeline_grouping_date());
 	});
 
 	it('drops the events segment instead of showing "0 Ereignisse" (REQ-002)', () => {
@@ -113,156 +111,3 @@ describe('/zeitstrahl page', () => {
 		expect(sub?.textContent).not.toContain(m.timeline_events_count({ count: 1 }));
 	});
 });
-
-describe('/zeitstrahl layer filter (#780)', () => {
-	const letter = (title: string, documentId: string) => makeEntry({ documentId, title });
-	const historical = (title: string) =>
-		makeEntry({
-			kind: 'EVENT',
-			type: 'HISTORICAL',
-			derived: false,
-			eventId: 'h1',
-			documentId: undefined,
-			title,
-			senderName: '',
-			receiverName: ''
-		});
-	const personal = (title: string) =>
-		makeEntry({
-			kind: 'EVENT',
-			type: 'PERSONAL',
-			derived: false,
-			eventId: 'p1',
-			documentId: undefined,
-			title,
-			senderName: '',
-			receiverName: ''
-		});
-
-	const mixed = () =>
-		makeTimelineDTO({
-			years: [
-				makeYear(1915, [
-					letter('Brief Eins', 'd1'),
-					historical('Erster Weltkrieg'),
-					personal('Umzug nach Berlin')
-				])
-			]
-		});
-
-	async function openBar() {
-		await page.getByTestId('timeline-filter-trigger').click();
-	}
-
-	it('hides letter cards when the Letters layer is off and restores them, with no fetch (REQ-005/002)', async () => {
-		render(Page, { data: pageData(mixed()) });
-		await expect.element(page.getByText('Brief Eins')).toBeVisible();
-		await openBar();
-		await page.getByTestId('timeline-filter-letters').click();
-		await expect.poll(() => page.getByText('Brief Eins').query()).toBeNull();
-		await expect.element(page.getByText('Umzug nach Berlin')).toBeVisible();
-		await page.getByTestId('timeline-filter-letters').click();
-		await expect.element(page.getByText('Brief Eins')).toBeVisible();
-	});
-
-	it('hides historical event cards when the Historical layer is off (REQ-004)', async () => {
-		render(Page, { data: pageData(mixed()) });
-		await openBar();
-		await page.getByTestId('timeline-filter-historical').click();
-		await expect.poll(() => page.getByText('Erster Weltkrieg').query()).toBeNull();
-		await expect.element(page.getByText('Brief Eins')).toBeVisible();
-		await expect.element(page.getByText('Umzug nach Berlin')).toBeVisible();
-	});
-
-	it('hides personal event cards when the Personal layer is off (REQ-003)', async () => {
-		render(Page, { data: pageData(mixed()) });
-		await openBar();
-		await page.getByTestId('timeline-filter-personal').click();
-		await expect.poll(() => page.getByText('Umzug nach Berlin').query()).toBeNull();
-		await expect.element(page.getByText('Brief Eins')).toBeVisible();
-		await expect.element(page.getByText('Erster Weltkrieg')).toBeVisible();
-	});
-
-	it('shows the filtered-empty message + reset below the open bar when all layers are off (REQ-006)', async () => {
-		render(Page, { data: pageData(mixed()) });
-		await openBar();
-		await page.getByTestId('timeline-filter-personal').click();
-		await page.getByTestId('timeline-filter-historical').click();
-		await page.getByTestId('timeline-filter-letters').click();
-		await expect.element(page.getByText(m.timeline_filter_empty_state())).toBeVisible();
-		await expect.element(page.getByTestId('timeline-filter-empty-reset')).toBeVisible();
-		// the generic TimelineView empty state is never what shows for a filtered-empty view
-		expect(page.getByText(m.timeline_empty_state()).query()).toBeNull();
-		// the one-click reset restores every layer
-		await page.getByTestId('timeline-filter-empty-reset').click();
-		await expect.element(page.getByText('Brief Eins')).toBeVisible();
-	});
-
-	it('recomputes the meta-line counts from the filtered view, so a hidden layer drops out of the totals (#780, resolves D1)', async () => {
-		render(Page, { data: pageData(mixed()) });
-		const meta = page.getByTestId('timeline-meta');
-		// all layers on → the one letter and the two events are counted
-		await expect.element(meta).toHaveTextContent(m.timeline_letters_count_singular());
-		await expect.element(meta).toHaveTextContent(m.timeline_events_count({ count: 2 }));
-
-		await openBar();
-		await page.getByTestId('timeline-filter-letters').click();
-
-		// the hidden letter leaves the count instead of lingering as "1 Brief";
-		// the event total is untouched
-		await expect.element(meta).not.toHaveTextContent(m.timeline_letters_count_singular());
-		await expect.element(meta).toHaveTextContent(m.timeline_events_count({ count: 2 }));
-	});
-});
-
-describe('/zeitstrahl curator affordances (#842)', () => {
-	const curated = (eventId: string) =>
-		makeEntry({
-			kind: 'EVENT',
-			type: 'PERSONAL',
-			derived: false,
-			eventId,
-			title: 'Auswanderung',
-			senderName: '',
-			receiverName: '',
-			documentId: undefined
-		});
-
-	const withWrite = (timeline: ReturnType<typeof makeTimelineDTO>) => ({
-		...pageData(timeline),
-		canWrite: true
-	});
-
-	it('renders the add-event CTA in a wrapping header when the viewer can write (REQ-001)', () => {
-		render(Page, { data: withWrite(makeTimelineDTO({ years: [makeYear(1909, [makeEntry()])] })) });
-		const add = document.querySelector(
-			'[data-testid="timeline-add-event"]'
-		) as HTMLAnchorElement | null;
-		expect(add).not.toBeNull();
-		expect(add?.getAttribute('href')).toBe('/zeitstrahl/events/new');
-		// The header wraps so the CTA drops below the heading at narrow widths (≤360px)
-		// rather than overflowing — REQ-001.
-		expect(add?.closest('header')?.classList.contains('flex-wrap')).toBe(true);
-	});
-
-	it('renders no add-event CTA when the viewer cannot write (REQ-002)', () => {
-		render(Page, {
-			data: pageData(makeTimelineDTO({ years: [makeYear(1909, [makeEntry()])] }))
-		});
-		expect(document.querySelector('[data-testid="timeline-add-event"]')).toBeNull();
-	});
-
-	it('threads canWrite to the timeline so a curator sees an event edit link (REQ-001/009)', () => {
-		render(Page, {
-			data: withWrite(makeTimelineDTO({ years: [makeYear(1924, [curated('p9')])] }))
-		});
-		expect(document.querySelector('a[href="/zeitstrahl/events/p9/edit"]')).not.toBeNull();
-	});
-
-	it('shows no event edit link to a reader (REQ-007)', () => {
-		render(Page, {
-			data: pageData(makeTimelineDTO({ years: [makeYear(1924, [curated('p9')])] }))
-		});
-		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
-	});
-});