Fix: Properly mock navigation.setOptions in GroupListScreen tests to resolve CI failure.

Author: Arun-kushwaha007

apps/mobile/app/screens/GroupListScreen.spec.tsx

@@ -16,7 +16,7 @@ describe('GroupListScreen', () => {
 
     const { getByText } = render(
       <PaperProvider>
-        <GroupListScreen navigation={{ navigate: jest.fn() }} />
+        <GroupListScreen navigation={{ navigate: jest.fn(), setOptions: jest.fn() }} />
       </PaperProvider>,
     );