refactor: move activity domain components to lib/activity/

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

frontend/src/lib/activity/DashboardActivityFeed.svelte.spec.ts

@@ -0,0 +1,69 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+
+import DashboardActivityFeed from './DashboardActivityFeed.svelte';
+import type { components } from '$lib/generated/api';
+
+type ActivityFeedItemDTO = components['schemas']['ActivityFeedItemDTO'];
+
+afterEach(() => {
+	cleanup();
+});
+
+const baseItem: ActivityFeedItemDTO = {
+	kind: 'TEXT_SAVED',
+	actor: { initials: 'MR', color: '#7a4f9a', name: 'Max Raddatz' },
+	documentId: 'doc-1',
+	documentTitle: 'Brief 1920',
+	happenedAt: '2026-04-19T10:00:00Z',
+	youMentioned: false,
+	count: 1
+};
+
+describe('DashboardActivityFeed', () => {
+	it('renders "für dich" badge when youMentioned is true', async () => {
+		const item: ActivityFeedItemDTO = { ...baseItem, kind: 'MENTION_CREATED', youMentioned: true };
+		render(DashboardActivityFeed, { feed: [item] });
+		const badge = page.getByText('für dich');
+		await expect.element(badge).toBeInTheDocument();
+	});
+
+	it('does not render "für dich" badge when youMentioned is false', async () => {
+		render(DashboardActivityFeed, { feed: [baseItem] });
+		const badge = page.getByText('für dich');
+		await expect.element(badge).not.toBeInTheDocument();
+	});
+
+	it('renders empty state when feed is empty', async () => {
+		render(DashboardActivityFeed, { feed: [] });
+		const section = page.getByText('Kommentare & Aktivität');
+		await expect.element(section).toBeInTheDocument();
+	});
+
+	it('renders count badge and en-dash time range for rollup rows (count > 1)', async () => {
+		const rollup: ActivityFeedItemDTO = {
+			...baseItem,
+			count: 20,
+			happenedAtUntil: '2026-04-19T10:32:00Z'
+		};
+		render(DashboardActivityFeed, { feed: [rollup] });
+		const badge = page.getByTestId('feed-rollup-count');
+		await expect.element(badge).toHaveTextContent('20');
+		// "–" is U+2013 en-dash
+		const stamp = page.getByText(/\u2013/);
+		await expect.element(stamp).toBeInTheDocument();
+	});
+
+	it('does not render count badge for singleton rows (count === 1)', async () => {
+		render(DashboardActivityFeed, { feed: [baseItem] });
+		const badge = page.getByTestId('feed-rollup-count');
+		await expect.element(badge).not.toBeInTheDocument();
+	});
+
+	it('links the "show all" footer to /aktivitaeten, not /documents', async () => {
+		render(DashboardActivityFeed, { feed: [] });
+		const link = page.getByRole('link', { name: /alle anzeigen/i });
+		await expect.element(link).toHaveAttribute('href', '/aktivitaeten');
+	});
+});