refactor: move activity domain components to lib/activity/

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

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

@@ -0,0 +1,39 @@
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page, userEvent } from 'vitest/browser';
+
+import ChronikErrorCard from './ChronikErrorCard.svelte';
+
+afterEach(cleanup);
+
+describe('ChronikErrorCard', () => {
+	it('renders the default error message', async () => {
+		render(ChronikErrorCard, { onRetry: vi.fn() });
+		await expect
+			.element(page.getByText('Die Chronik konnte nicht geladen werden.'))
+			.toBeInTheDocument();
+	});
+
+	it('renders the retry button with the expected label', async () => {
+		render(ChronikErrorCard, { onRetry: vi.fn() });
+		await expect.element(page.getByText('Erneut versuchen')).toBeInTheDocument();
+	});
+
+	it('renders a custom message when provided', async () => {
+		render(ChronikErrorCard, { onRetry: vi.fn(), message: 'Netzwerkfehler' });
+		await expect.element(page.getByText('Netzwerkfehler')).toBeInTheDocument();
+	});
+
+	it('calls onRetry when the retry button is clicked', async () => {
+		const onRetry = vi.fn();
+		render(ChronikErrorCard, { onRetry });
+		await userEvent.click(page.getByText('Erneut versuchen'));
+		expect(onRetry).toHaveBeenCalledTimes(1);
+	});
+
+	it('has role="alert" on the wrapper', async () => {
+		render(ChronikErrorCard, { onRetry: vi.fn() });
+		const alert = document.querySelector('[role="alert"]');
+		expect(alert).not.toBeNull();
+	});
+});