feat(timeline): add EventPill for derived + curated event pills

Centered axis pill: derived life-events (* Geburt / † Tod / ⚭ Heirat) and curated
PERSONAL events (★, mint border) via getAccentConfig. Glyph wrapped aria-hidden +
sr-only label (REQ-018). Edit affordance only for a curated event with eventId,
never derived/null (REQ-008). REQ-007.

Refs #779
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/src/lib/timeline/EventPill.svelte

@@ -0,0 +1,59 @@
+<script lang="ts">
+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 glyph is wrapped aria-hidden with an sr-only label sibling
+ * (REQ-018). An edit affordance shows only for a curated event with an eventId
+ * (never derived, never null — REQ-008).
+ */
+let { entry }: { entry: TimelineEntryDTO } = $props();
+
+const config = $derived(getAccentConfig(entry));
+const dateLabel = $derived(timelineDateLabel(entry.eventDate, entry.precision, entry.eventDateEnd));
+const canEdit = $derived(!entry.derived && entry.eventId != null);
+</script>
+
+<div class="flex justify-center">
+	<div
+		class="inline-flex items-center gap-2 rounded-full bg-surface px-3 py-1 shadow-sm {config.accent ===
+		'curated'
+			? 'border-2 border-brand-mint'
+			: 'border border-brand-navy'}"
+	>
+		<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}
+			{#if dateLabel}
+				<span class="block font-sans text-xs text-ink-3">{dateLabel}</span>
+			{/if}
+		</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

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+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import EventPill from './EventPill.svelte';
+import { makeEntry } from './test-factories';
+
+afterEach(() => cleanup());
+
+const EVENT_ID = '33333333-3333-3333-3333-333333333333';
+
+function derived(derivedType: 'BIRTH' | 'DEATH' | 'MARRIAGE', title: string) {
+	return makeEntry({
+		kind: 'EVENT',
+		derived: true,
+		derivedType,
+		title,
+		senderName: '',
+		receiverName: '',
+		precision: 'YEAR',
+		eventDate: '1914-01-01',
+		documentId: undefined
+	});
+}
+
+describe('EventPill', () => {
+	it('renders a derived marriage as ⚭ + "Heirat" + title (REQ-007)', () => {
+		render(EventPill, { entry: derived('MARRIAGE', 'Heirat: Karl & Elfriede') });
+		expect(document.body.textContent).toContain('⚭');
+		expect(document.body.textContent).toContain('Heirat');
+		expect(document.body.textContent).toContain('Heirat: Karl & Elfriede');
+	});
+
+	it('renders a derived birth as * + "Geburt" (REQ-007)', () => {
+		render(EventPill, { entry: derived('BIRTH', 'Geburt: Hans') });
+		expect(document.body.textContent).toContain('*');
+		expect(document.body.textContent).toContain('Geburt');
+	});
+
+	it('renders a derived death as † + "Tod" (REQ-007)', () => {
+		render(EventPill, { entry: derived('DEATH', 'Tod: Karl') });
+		expect(document.body.textContent).toContain('†');
+		expect(document.body.textContent).toContain('Tod');
+	});
+
+	it('wraps the glyph aria-hidden with an sr-only label sibling (REQ-018)', () => {
+		render(EventPill, { entry: derived('BIRTH', 'Geburt: Hans') });
+		const hidden = document.querySelector('[aria-hidden="true"]');
+		expect(hidden?.textContent).toBe('*');
+		const srOnly = document.querySelector('.sr-only');
+		expect(srOnly?.textContent).toBe('Geburt');
+	});
+
+	it('shows an edit affordance for a curated PERSONAL event with an eventId (REQ-008)', () => {
+		render(EventPill, {
+			entry: makeEntry({
+				kind: 'EVENT',
+				derived: false,
+				type: 'PERSONAL',
+				eventId: EVENT_ID,
+				title: 'Auswanderung',
+				senderName: '',
+				receiverName: '',
+				documentId: undefined
+			})
+		});
+		const edit = document.querySelector('[data-testid="event-edit"]') as HTMLAnchorElement | null;
+		expect(edit).not.toBeNull();
+		expect(edit?.getAttribute('href')).toContain(EVENT_ID);
+	});
+
+	it('shows no edit affordance when eventId is null (REQ-008)', () => {
+		render(EventPill, {
+			entry: makeEntry({
+				kind: 'EVENT',
+				derived: false,
+				type: 'PERSONAL',
+				eventId: undefined,
+				title: 'Auswanderung',
+				senderName: '',
+				receiverName: '',
+				documentId: undefined
+			})
+		});
+		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
+	});
+
+	it('shows no edit affordance for a derived event (REQ-008)', () => {
+		render(EventPill, { entry: derived('MARRIAGE', 'Heirat') });
+		expect(document.querySelector('[data-testid="event-edit"]')).toBeNull();
+	});
+});