fix: close TestClient properly in auth_client fixture to prevent gzip cleanup errors

tests/test_auth_api.py

@@ -75,6 +75,12 @@ def auth_client():
     from fastapi.testclient import TestClient
     client = TestClient(app)
     yield client
+    # Properly close the test client to flush gzip writers
+    # before the temp directory is removed
+    if hasattr(client, 'close'):
+        client.close()
+    # Give the event loop a chance to clean up pending callbacks
+    loop.run_until_complete(asyncio.sleep(0))
 
     os.chdir(orig_cwd)
     shutil.rmtree(str(tmp), ignore_errors=True)