feat(#145): add DashboardRecentDocuments widget component

Shows recently reviewed documents as a dashboard widget with formatted
dates. Renders nothing when the list is empty.

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

frontend/src/lib/components/DashboardRecentDocuments.svelte

@@ -0,0 +1,48 @@
+<script lang="ts">
+type Document = {
+	id: string;
+	title: string;
+	documentDate?: string;
+	sender?: { id: string; firstName: string; lastName: string };
+};
+
+interface Props {
+	recentDocs: Document[];
+}
+
+let { recentDocs }: Props = $props();
+
+function formatDate(dateStr: string): string {
+	return new Intl.DateTimeFormat('de-DE', {
+		day: 'numeric',
+		month: 'long',
+		year: 'numeric'
+	}).format(new Date(dateStr + 'T12:00:00'));
+}
+</script>
+
+{#if recentDocs.length > 0}
+	<div data-testid="dashboard-recent-docs" class="border-brand-sand rounded-sm border bg-white p-6">
+		<h2 class="mb-4 font-sans text-xs font-bold tracking-widest text-gray-400 uppercase">
+			Zuletzt hinzugefügt
+		</h2>
+		{#each recentDocs as doc (doc.id)}
+			<div class="border-brand-sand flex items-center justify-between border-b py-2 last:border-0">
+				<a
+					href="/documents/{doc.id}"
+					class="font-serif text-sm text-ink hover:text-brand-navy hover:underline"
+				>
+					{doc.title}
+				</a>
+				{#if doc.documentDate}
+					<span
+						data-testid="doc-date-{doc.id}"
+						class="ml-2 shrink-0 font-sans text-xs text-gray-400"
+					>
+						{formatDate(doc.documentDate)}
+					</span>
+				{/if}
+			</div>
+		{/each}
+	</div>
+{/if}

frontend/src/lib/components/DashboardRecentDocuments.svelte.spec.ts

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+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+
+import DashboardRecentDocuments from './DashboardRecentDocuments.svelte';
+
+afterEach(cleanup);
+
+type Document = {
+	id: string;
+	title: string;
+	documentDate?: string;
+	sender?: { id: string; firstName: string; lastName: string };
+};
+
+function makeDoc(id: string, title: string, date?: string): Document {
+	return { id, title, documentDate: date };
+}
+
+describe('DashboardRecentDocuments', () => {
+	it('renders nothing when recentDocs is empty', async () => {
+		render(DashboardRecentDocuments, { recentDocs: [] });
+		const widget = page.getByTestId('dashboard-recent-docs');
+		await expect.element(widget).not.toBeInTheDocument();
+	});
+
+	it('shows the widget when recentDocs are present', async () => {
+		render(DashboardRecentDocuments, { recentDocs: [makeDoc('d1', 'Taufschein')] });
+		const widget = page.getByTestId('dashboard-recent-docs');
+		await expect.element(widget).toBeInTheDocument();
+	});
+
+	it('renders a link to /documents/{id} for each document', async () => {
+		const docs = [makeDoc('d1', 'Taufschein'), makeDoc('d2', 'Heiratsurkunde')];
+		render(DashboardRecentDocuments, { recentDocs: docs });
+		const links = page.getByRole('link');
+		await expect.element(links.nth(0)).toHaveAttribute('href', '/documents/d1');
+		await expect.element(links.nth(1)).toHaveAttribute('href', '/documents/d2');
+	});
+
+	it('shows the document title in each row', async () => {
+		render(DashboardRecentDocuments, {
+			recentDocs: [makeDoc('d1', 'Sterbeurkunde 1930', '1930-05-12')]
+		});
+		await expect.element(page.getByText('Sterbeurkunde 1930')).toBeInTheDocument();
+	});
+
+	it('formats and displays the document date when present', async () => {
+		render(DashboardRecentDocuments, { recentDocs: [makeDoc('d1', 'Dok', '1945-04-20')] });
+		// The date should be visible in some formatted form
+		const widget = page.getByTestId('dashboard-recent-docs');
+		await expect.element(widget).toBeInTheDocument();
+		// Just verify the date element exists (not exact format due to locale)
+		const dateEl = page.getByTestId('doc-date-d1');
+		await expect.element(dateEl).toBeInTheDocument();
+	});
+});