fix: preserve model_base_url in copy()/with_options()

Author: chrisreadsf

src/stagehand/_client.py

@@ -239,6 +239,7 @@ def copy(
         browserbase_api_key: str | None = None,
         browserbase_project_id: str | None = None,
         model_api_key: str | None = None,
+        model_base_url: str | None = None,
         server: Literal["remote", "local"] | None = None,
         _local_stagehand_binary_path: str | os.PathLike[str] | None = None,
         local_host: str | None = None,
@@ -284,6 +285,7 @@ def copy(
             browserbase_api_key=browserbase_api_key or self.browserbase_api_key,
             browserbase_project_id=browserbase_project_id or self.browserbase_project_id,
             model_api_key=model_api_key or self.model_api_key,
+            model_base_url=model_base_url or self.model_base_url,
             server=server or self._server_mode,
             _local_stagehand_binary_path=_local_stagehand_binary_path if _local_stagehand_binary_path is not None else self._local_stagehand_binary_path,
             local_host=local_host or self._local_host,
@@ -536,6 +538,7 @@ def copy(
         browserbase_api_key: str | None = None,
         browserbase_project_id: str | None = None,
         model_api_key: str | None = None,
+        model_base_url: str | None = None,
         server: Literal["remote", "local"] | None = None,
         _local_stagehand_binary_path: str | os.PathLike[str] | None = None,
         local_host: str | None = None,
@@ -581,6 +584,7 @@ def copy(
             browserbase_api_key=browserbase_api_key or self.browserbase_api_key,
             browserbase_project_id=browserbase_project_id or self.browserbase_project_id,
             model_api_key=model_api_key or self.model_api_key,
+            model_base_url=model_base_url or self.model_base_url,
             server=server or self._server_mode,
             _local_stagehand_binary_path=_local_stagehand_binary_path if _local_stagehand_binary_path is not None else self._local_stagehand_binary_path,
             local_host=local_host or self._local_host,