test(05-04): add failing tests for calendar settings panel

- Three test cases: source list with name/type/visibility, visibility toggle calls updateSource, form validation
- Mocks calendar-api functions following existing test patterns

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

apps/web/src/app/(portal)/settings/dashboard/calendar/calendar-settings.test.tsx

@@ -0,0 +1,146 @@
+import { cleanup, render, screen, waitFor, fireEvent } from '@testing-library/react';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+
+// Mock next-intl
+vi.mock('next-intl', () => ({
+  useTranslations: (ns: string) => (key: string) => {
+    const map: Record<string, Record<string, string>> = {
+      widgets: {
+        'calendar.addSource': 'Add source',
+        'calendar.sourceEmpty': 'No calendar sources configured. Add a source to display events.',
+        'calendar.connectionSuccess': 'Connection successful',
+        'calendar.connectionError': 'Connection failed. Please check the URL and credentials.',
+      },
+      settings: {
+        categoryCalendar: 'Calendar',
+        sourceDeleteConfirm: 'Are you sure you want to delete this calendar source?',
+        sourceDeleteCta: 'Delete source',
+        cancel: 'Cancel',
+      },
+    };
+    return map[ns]?.[key] ?? key;
+  },
+}));
+
+// Mock calendar-api
+const mockFetchSources = vi.fn();
+const mockUpdateSource = vi.fn();
+const mockAddSource = vi.fn();
+const mockDeleteSource = vi.fn();
+const mockTestSource = vi.fn();
+
+vi.mock('@/lib/calendar-api', () => ({
+  fetchSources: (...args: unknown[]) => mockFetchSources(...args),
+  updateSource: (...args: unknown[]) => mockUpdateSource(...args),
+  addSource: (...args: unknown[]) => mockAddSource(...args),
+  deleteSource: (...args: unknown[]) => mockDeleteSource(...args),
+  testSource: (...args: unknown[]) => mockTestSource(...args),
+}));
+
+afterEach(() => {
+  cleanup();
+  vi.restoreAllMocks();
+});
+
+describe('CalendarSettingsPanel', () => {
+  it('lists two sources with name, type badge, and visibility toggle', async () => {
+    mockFetchSources.mockResolvedValue([
+      {
+        id: 's1',
+        name: 'Work Calendar',
+        type: 'caldav',
+        isVisible: true,
+        color: '#ff0000',
+        lastSyncError: null,
+      },
+      {
+        id: 's2',
+        name: 'Holidays',
+        type: 'ics',
+        isVisible: false,
+        color: '#00ff00',
+        lastSyncError: null,
+      },
+    ]);
+
+    const { CalendarSettingsPanel } = await import(
+      '@/components/settings/calendar-settings-panel'
+    );
+    render(<CalendarSettingsPanel />);
+
+    await waitFor(() => {
+      expect(screen.getByText('Work Calendar')).toBeInTheDocument();
+    });
+
+    expect(screen.getByText('Holidays')).toBeInTheDocument();
+
+    // Type badges
+    expect(screen.getByText('CalDAV')).toBeInTheDocument();
+    expect(screen.getByText('ICS')).toBeInTheDocument();
+
+    // Visibility toggles (checkboxes or switches)
+    const toggles = screen.getAllByRole('switch');
+    expect(toggles).toHaveLength(2);
+  });
+
+  it('calls updateSource with isVisible when toggling a source', async () => {
+    mockFetchSources.mockResolvedValue([
+      {
+        id: 's1',
+        name: 'Work Calendar',
+        type: 'caldav',
+        isVisible: true,
+        color: '#ff0000',
+        lastSyncError: null,
+      },
+    ]);
+    mockUpdateSource.mockResolvedValue({
+      id: 's1',
+      name: 'Work Calendar',
+      type: 'caldav',
+      isVisible: false,
+    });
+
+    const { CalendarSettingsPanel } = await import(
+      '@/components/settings/calendar-settings-panel'
+    );
+    render(<CalendarSettingsPanel />);
+
+    await waitFor(() => {
+      expect(screen.getByText('Work Calendar')).toBeInTheDocument();
+    });
+
+    const toggle = screen.getByRole('switch');
+    fireEvent.click(toggle);
+
+    await waitFor(() => {
+      expect(mockUpdateSource).toHaveBeenCalledWith('s1', { isVisible: false });
+    });
+  });
+
+  it('requires name, type, and url before enabling add form submit', async () => {
+    mockFetchSources.mockResolvedValue([]);
+
+    const { CalendarSettingsPanel } = await import(
+      '@/components/settings/calendar-settings-panel'
+    );
+    render(<CalendarSettingsPanel />);
+
+    // Wait for empty state then click add button
+    await waitFor(() => {
+      expect(
+        screen.getByText('No calendar sources configured. Add a source to display events.'),
+      ).toBeInTheDocument();
+    });
+
+    // Click the add source button
+    const addButton = screen.getByText('Add source');
+    fireEvent.click(addButton);
+
+    // Find the submit button in the form
+    await waitFor(() => {
+      const submitButton = screen.getByTestId('source-form-submit');
+      expect(submitButton).toBeDisabled();
+    });
+  });
+});