[Feature] 期望可以保存横向布局

### 功能描述 / Description

期望可以保存当前横向布局，因为节点太多纵向不太方便查看。

### 请求动机 / Motivation

方便查看，同时横向布局比纵向布局美观

### 其他 / Miscellaneous

_No response_

### 贡献 / Contribution

- [ ] 我乐意为此贡献 PR！ / I am interested in contributing a PR for this!

Start by locating the workflow editor's layout controls and the code that persists the current layout. Trace how the existing vertical layout is selected and saved, then verify that choosing horizontal layout survives a reload and displays nodes in the requested orientation.

Written by the indexing model from the issue text.