fix(frontend): fix TS2352 type cast in AdvancedTab test mock

ccw/frontend/src/components/codexlens/AdvancedTab.test.tsx

@@ -85,7 +85,7 @@ function setupDefaultMocks() {
   vi.mocked(useNotifications).mockReturnValue({
     success: mockToastSuccess,
     error: mockToastError,
-  } as ReturnType<typeof useNotifications>);
+  } as unknown as ReturnType<typeof useNotifications>);
 }
 
 describe('AdvancedTab', () => {