绘图mermaid中节点内容用换行，不能弹窗渲染

[304792747]

Describe the bug
vnote使用版本：3.19.2

可以正常弹窗渲染

graph TD
a[123456]

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使用换行后不能正常弹窗渲染【使用 下面三种方法都不可以】

graph TD
a[123\n456]

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graph TD
a[123<br>456]

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graph TD
a[123
456]

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To Reproduce
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4. See error

Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. Windows 11]

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