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>