refactor: move activity domain components to lib/activity/

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

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

@@ -0,0 +1,30 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+
+import ChronikEmptyState from './ChronikEmptyState.svelte';
+
+afterEach(cleanup);
+
+describe('ChronikEmptyState', () => {
+	it('renders first-run variant title', async () => {
+		render(ChronikEmptyState, { variant: 'first-run' });
+		await expect.element(page.getByText('Noch nichts geschehen')).toBeInTheDocument();
+	});
+
+	it('renders filter-empty variant title', async () => {
+		render(ChronikEmptyState, { variant: 'filter-empty' });
+		await expect.element(page.getByText('Nichts in dieser Ansicht')).toBeInTheDocument();
+	});
+
+	it('renders inbox-zero variant title', async () => {
+		render(ChronikEmptyState, { variant: 'inbox-zero' });
+		await expect.element(page.getByText('Keine neuen Erwähnungen')).toBeInTheDocument();
+	});
+
+	it('applies the expected data-variant attribute', async () => {
+		render(ChronikEmptyState, { variant: 'first-run' });
+		const wrapper = document.querySelector('[data-testid="chronik-empty-state"]');
+		expect(wrapper?.getAttribute('data-variant')).toBe('first-run');
+	});
+});