feat(timeline): show provenance token on the event pill (REQ-007)

The derived/curated pill subtitle now reads "{date} · abgeleitet" or
"{date} · kuratiert", keyed off entry.derived so a reader sees both the
date and whether the event was derived from Person data or curated. Only
the single provenance token ships; the spec sheet's "· persönlich" /
"· SEASON" annotations stay out (already covered by the ★ glyph + mint
border and not production UI).

Refs #833
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/timeline/EventPill.svelte

@@ -16,6 +16,11 @@ 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()
+);
 const canEdit = $derived(!entry.derived && entry.eventId != null);
 </script>
 
@@ -42,7 +47,7 @@ const canEdit = $derived(!entry.derived && entry.eventId != null);
 				>
 			{/if}
 			{#if dateLabel}
-				<span class="block font-sans text-xs text-ink-3">{dateLabel}</span>
+				<span class="block font-sans text-xs text-ink-3">{dateLabel} · {provenance}</span>
 			{/if}
 		</span>
 		{#if canEdit}

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

@@ -1,6 +1,8 @@
 import { describe, it, expect, afterEach } from 'vitest';
 import { cleanup, render } from 'vitest-browser-svelte';
+import * as m from '$lib/paraglide/messages.js';
 import EventPill from './EventPill.svelte';
+import { timelineDateLabel } from './dateLabel';
 import { makeEntry } from './test-factories';
 
 afterEach(() => cleanup());
@@ -87,4 +89,35 @@ describe('EventPill', () => {
 		render(EventPill, { entry: derived('MARRIAGE', 'Heirat') });
 		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
 	});
+
+	it('appends the "abgeleitet" provenance token to a derived pill subtitle (REQ-007)', () => {
+		const entry = derived('BIRTH', 'Geburt: Hans');
+		const date = timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd);
+		render(EventPill, { entry });
+		expect(document.body.textContent).toContain(`${date} · ${m.timeline_provenance_derived()}`);
+	});
+
+	it('appends the "kuratiert" provenance token to a curated PERSONAL pill subtitle (REQ-007)', () => {
+		const entry = makeEntry({
+			kind: 'EVENT',
+			derived: false,
+			type: 'PERSONAL',
+			eventId: EVENT_ID,
+			title: 'Auswanderung',
+			senderName: '',
+			receiverName: '',
+			precision: 'YEAR',
+			eventDate: '1924-01-01',
+			documentId: undefined
+		});
+		const date = timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd);
+		render(EventPill, { entry });
+		expect(document.body.textContent).toContain(`${date} · ${m.timeline_provenance_curated()}`);
+	});
+
+	it('never shows the spec-sheet-only "persönlich"/"SEASON" tokens (REQ-007)', () => {
+		render(EventPill, { entry: derived('BIRTH', 'Geburt: Hans') });
+		expect(document.body.textContent).not.toContain('persönlich');
+		expect(document.body.textContent).not.toContain('SEASON');
+	});
 });