fix: guard transient controls and verify timeline endpoints

tests/unit/agents/test_flash_runner.py

@@ -134,7 +134,9 @@ async def test_fallback_observation_renders_the_indexed_ui_list(mock_context, tm
 
     assert post == _POST_IMG
     assert isinstance(exec_result.ui_elements_text, str)
-    assert exec_result.ui_elements_text == "[1] Text: 'Settings' | Bounds: [37,50][962,112]"
+    assert exec_result.ui_elements_text == (
+        "[1] Text: 'Settings' | Bounds: [37,50][962,112] | resource_id: 'android:id/title'"
+    )
     assert "{'text'" not in exec_result.ui_elements_text
     # State refreshed exactly as the executor's success path does.
     assert state.indexed_elements[0]["index"] == 1