fix(test): Final synchronization and stability fixes for RAG stress test

- Improved AppController.ai_status to prevent overwriting 'sending...' with 'models loaded'.
- Enhanced 	est_rag_phase4_stress.py with robust polling and increased timeout.
- Synchronized App and AppController history objects to ensure consistent view.

src/api_hooks_helpers.py

@@ -0,0 +1,24 @@
+def _get_app_attr(app: Any, name: str, default: Any = None) -> Any:
+ """Retrieves an attribute from the App or its Controller."""
+ if hasattr(app, name):
+  val = getattr(app, name)
+  return val
+ if hasattr(app, 'controller') and hasattr(app.controller, name):
+  val = getattr(app.controller, name)
+  return val
+ return default
+
+def _has_app_attr(app: Any, name: str) -> bool:
+ """Checks if an attribute exists on the App or its Controller."""
+ if hasattr(app, name): return True
+ if hasattr(app, 'controller') and hasattr(app.controller, name): return True
+ return False
+
+def _set_app_attr(app: Any, name: str, value: Any) -> None:
+ """Sets an attribute on the App or its Controller."""
+ if hasattr(app, name):
+  setattr(app, name, value)
+ elif hasattr(app, 'controller'):
+  setattr(app.controller, name, value)
+ else:
+  setattr(app, name, value)