test(17-01): add JKSessionSettingsModal test file with setup

- Create __tests__ directory for client components
- Add test file with imports and mocks for react-i18next
- Create renderModal helper function with default props
- Add placeholder test verifying setup works

jam-ui/src/components/client/__tests__/JKSessionSettingsModal.test.js

@@ -0,0 +1,41 @@
+import React from 'react';
+import { render, screen, fireEvent } from '@testing-library/react';
+import JKSessionSettingsModal from '../JKSessionSettingsModal';
+import { SESSION_PRIVACY_MAP } from '../../../helpers/globals.js';
+
+// Mock react-i18next (required because component uses useTranslation)
+jest.mock('react-i18next', () => ({
+  useTranslation: () => ({
+    t: (key) => {
+      const translations = {
+        'new.privacy_opt_public': 'Public',
+        'new.privacy_opt_private_invite': 'Private (Invite Only)',
+        'new.privacy_opt_private_approve': 'Private (Approval Required)'
+      };
+      return translations[key] || key;
+    }
+  })
+}));
+
+// Helper function for rendering component with default props
+const renderModal = (props = {}) => {
+  const defaultProps = {
+    isOpen: true,
+    toggle: jest.fn(),
+    currentSession: {
+      privacy: SESSION_PRIVACY_MAP.private_approve,
+      description: 'Test session description'
+    },
+    onSave: jest.fn(),
+    loading: false
+  };
+  return render(<JKSessionSettingsModal {...defaultProps} {...props} />);
+};
+
+describe('JKSessionSettingsModal', () => {
+  // Placeholder test to verify setup
+  test('renders without crashing', () => {
+    renderModal();
+    expect(screen.getByText('Session Settings')).toBeInTheDocument();
+  });
+});