更换笔记本和文档默认图标为 SVG 图标

> <img width="222" height="167" alt="Image" src="https://github.com/user-attachments/assets/14d58b42-c89f-4017-b91f-6451cf706431" />
> 
> 我觉得默认应该改成用 svg 而不是 emoji 更好，emoji 在不同的系统长得不一样，感觉比较奇怪

 _Originally posted by @TCOTC in [#18072](https://github.com/siyuan-note/siyuan/issues/18072#issuecomment-4883382416)_

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https://github.com/siyuan-note/siyuan/issues/17793