feat(dashboard): add reader dashboard components

Adds 5 new components for the permission-gated reader layout:
- ReaderStatsStrip: stat tiles (documents / persons / stories) linking to list pages
- ReaderPersonChips: top-N persons by doc count with avatar + name
- ReaderDraftsModule: blog draft list for BLOG_WRITE users
- ReaderRecentDocs: 5 most-recently-updated docs with Neu/Aktualisiert badge
- ReaderRecentStories: 3 latest published stories with 150-char HTML-stripped excerpt

Each component ships with a vitest-browser spec covering the key assertions.
Avatar color/initials logic is inlined to satisfy $lib/shared → $lib/person
boundary rule.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/lib/shared/dashboard/ReaderDraftsModule.svelte

@@ -0,0 +1,38 @@
+<script lang="ts">
+import * as m from '$lib/paraglide/messages.js';
+import { relativeTimeDe } from '$lib/shared/relativeTime';
+import type { components } from '$lib/generated/api';
+
+type Geschichte = components['schemas']['Geschichte'];
+
+interface Props {
+	drafts: Geschichte[];
+}
+
+const { drafts }: Props = $props();
+</script>
+
+<div class="rounded-sm border border-line bg-surface p-6 shadow-sm">
+	<h2 class="mb-5 text-xs font-bold tracking-widest text-ink-3 uppercase">
+		{m.dashboard_reader_drafts_heading()}
+	</h2>
+	{#if drafts.length === 0}
+		<p class="font-sans text-sm text-ink-3">{m.dashboard_reader_drafts_empty()}</p>
+	{:else}
+		<ul class="flex flex-col gap-2">
+			{#each drafts as draft (draft.id)}
+				<li>
+					<a
+						href="/geschichten/{draft.id}/edit"
+						class="flex min-h-[44px] items-center justify-between gap-4 rounded-sm py-2 transition-colors hover:text-brand-mint focus-visible:ring-2 focus-visible:ring-brand-navy focus-visible:outline-none"
+					>
+						<span class="text-ink-1 truncate font-serif text-sm">{draft.title}</span>
+						<span class="shrink-0 font-sans text-xs text-ink-3">
+							{relativeTimeDe(new Date(draft.updatedAt))}
+						</span>
+					</a>
+				</li>
+			{/each}
+		</ul>
+	{/if}
+</div>