fix(test): Resolve visual orchestration test and prepare hook env injection

src/app_controller.py

@@ -352,9 +352,9 @@ class AppController:
    'btn_approve_spawn': lambda: self._handle_mma_respond(approved=True),
   }
   self._predefined_callbacks: dict[str, Callable[..., Any]] = {
-   '_test_callback_func_write_to_file': self._test_callback_func_write_to_file
+   '_test_callback_func_write_to_file': self._test_callback_func_write_to_file,
+   '_set_env_var': lambda k, v: os.environ.update({k: v})
   }
-
  def _update_gcli_adapter(self, path: str) -> None:
   sys.stderr.write(f"[DEBUG] _update_gcli_adapter called with: {path}\n")
   sys.stderr.flush()