hexo-renderer-markdown-it渲染器渲染数学公式有问题

## Issue Checklist 


- [ x] I am using [the latest](https://github.com/theme-next/hexo-theme-next/releases/latest) version of NexT.
- [ x] I have read the relevant documents of [Hexo](https://hexo.io/docs/) and [NexT](https://theme-next.org/docs/).
- [ x] I have reviewed the latest Roadmap on GitHub and searched for current [issues](https://github.com/theme-next/hexo-theme-next/issues), which does not help me.

***

## Expected behavior 

<img width="1076" height="191" alt="Image" src="https://github.com/user-attachments/assets/165bd069-d118-4f12-ae68-1a8afcf91a96" />

## Actual behavior 

<img width="1068" height="215" alt="Image" src="https://github.com/user-attachments/assets/7c9d0f3d-9395-4229-944e-2e222aecde97" />
对应网页html代码

```html
<html>
<body>

对于一个十进制数253，可表示为<math><semantics><mrow><mn>2</mn><mo>×</mo><msup><mrow><mn>1</mn><mn>0</mn></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mn>5</mn><mo>×</mo><msup><mrow><mn>1</mn><mn>0</mn></mrow><mrow><mn>1</mn></mrow></msup><mo>+</mo><mn>3</mn><mo>×</mo><msup><mrow><mn>1</mn><mn>0</mn></mrow><mrow><mn>0</mn></mrow></msup></mrow><annotation encoding="application/x-tex">2 \times {10}^{2} + 5 \times {10}^{1} + 3 \times {10}^{0}</annotation></semantics></math>2×10​2​​+5×10​1​​+3×10​0​​ .
--
<math><semantics><mrow><msubsup><mo>∫</mo><mrow><mo>−</mo><mi mathvariant="normal">∞</mi></mrow><mrow><mi mathvariant="normal">∞</mi></mrow></msubsup><msup><mi>e</mi><mrow><mo>−</mo><msup><mi>x</mi><mn>2</mn></msup></mrow></msup><mi>d</mi><mi>x</mi><mo>=</mo><msqrt><mrow><mi>π</mi></mrow></msqrt></mrow><annotation encoding="application/x-tex">\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi}


</body>
</html>
```

## Steps to reproduce the behavior 
1. 根据教程“数学公式”篇，我采用了hexo-renderer-markdown-it配合markdown-it-katex来作为渲染，均按照教程来。
这是关键的配置部分：
``` 
# _config.yml
#hexo-renderer-markdown-it
markdown:
 render:
 html: true
 xhtmlOut: false
 breaks: true
 linkify: true
 typographer: true
 quotes: '“”‘’'
 plugins:
 - markdown-it-katex
 images:
 lazyload: true
 prepend_root: true
 post_asset: true
```

```
#_config.next.yml
 katex:
 enable: true
 # See: https://github.com/KaTeX/KaTeX/tree/master/contrib/copy-tex
 copy_tex: true
````

2. 渲染后的结果如上面所示，上标变成了下标。
3. 于是尝试禁用掉next的数学配置部分（实测per_page: true的开启与否无影响）：
```
#_config.next.yml
 katex:
 enable: false
 # See: https://github.com/KaTeX/KaTeX/tree/master/contrib/copy-tex
 copy_tex: false
````
4. 发现网页渲染正常，但会重复：

<img width="1159" height="203" alt="Image" src="https://github.com/user-attachments/assets/54c80c3c-f6a9-4c63-aeea-69ad7554112a" />

对应的html：

```
<html>
<body>

对于一个十进制数253，可表示为<math><semantics><mrow><mn>2</mn><mo>×</mo><msup><mrow><mn>1</mn><mn>0</mn></mrow><mrow><mn>2</mn></mrow></msup><mo>+</mo><mn>5</mn><mo>×</mo><msup><mrow><mn>1</mn><mn>0</mn></mrow><mrow><mn>1</mn></mrow></msup><mo>+</mo><mn>3</mn><mo>×</mo><msup><mrow><mn>1</mn><mn>0</mn></mrow><mrow><mn>0</mn></mrow></msup></mrow><annotation encoding="application/x-tex">2 \times {10}^{2} + 5 \times {10}^{1} + 3 \times {10}^{0}</annotation></semantics></math>2×10​2​​+5×10​1​​+3×10​0​​ .
--
<math><semantics><mrow><msubsup><mo>∫</mo><mrow><mo>−</mo><mi mathvariant="normal">∞</mi></mrow><mrow><mi mathvariant="normal">∞</mi></mrow></msubsup><msup><mi>e</mi><mrow><mo>−</mo><msup><mi>x</mi><mn>2</mn></msup></mrow></msup><mi>d</mi><mi>x</mi><mo>=</mo><msqrt><mrow><mi>π</mi></mrow></msqrt></mrow><annotation encoding="application/x-tex">\int_{-\infty}^{\infty} e^{-x^2} dx = \sqrt{\pi}
</annotation></semantics></math>∫​−∞​∞​​e​−x​2​​​​dx=√​π​​​


</body>
</html>
```
5. 于是询问deepseek，添加了一个自定义的source/_data/styles.styl
```
// 隐藏 HTML 版本，只显示 MathML
.katex .katex-html {
 display: none !important;
}
```
6. 保持next的数学部分的配置不变，更改部分见下图：主配置文件也不变（_config.yml）
<img width="659" height="303" alt="Image" src="https://github.com/user-attachments/assets/79c1835b-a050-48a4-9542-2a6bf4a4f354" />

7. clean && g生成后正常了

<img width="975" height="261" alt="Image" src="https://github.com/user-attachments/assets/7dac6db5-851c-4806-9425-0cb77e6fce37" />

5. ## Environment Information

### Node.js and NPM Information

```
v20.20.2
10.8.2

```

### Package dependencies Information

```
hexo-site@0.0.0 /mnt/ext4_data/hexo-data
├── hexo-blog-encrypt@3.1.9
├── hexo-excerpt@1.3.1
├── hexo-generator-archive@2.0.0
├── hexo-generator-category@2.0.0
├── hexo-generator-index@4.0.0
├── hexo-generator-tag@2.0.0
├── hexo-renderer-ejs@2.0.0
├── hexo-renderer-markdown-it@7.1.1
├── hexo-renderer-stylus@3.0.1
├── hexo-server@3.0.0
├── hexo-theme-next@8.27.0
├── hexo@8.1.1
└── markdown-it-katex@2.0.3

```

### Hexo Configuration

```yml
# Hexo Configuration
## Docs: https://hexo.io/docs/configuration.html
## Source: https://github.com/hexojs/hexo/

# Site
title: gyfy98's blog
subtitle: ''
description: ''
keywords:
author: gyfy98
language: zh-CN
timezone: ''

# URL
## Set your site url here. For example, if you use GitHub Page, set url as 'https://username.github.io/project'
url: xxxxxx
permalink: :year/:month/:day/:title/
permalink_defaults:
pretty_urls:
 trailing_index: true # Set to false to remove trailing 'index.html' from permalinks
 trailing_html: true # Set to false to remove trailing '.html' from permalinks

# Directory
source_dir: source
public_dir: public
tag_dir: tags
archive_dir: archives
category_dir: categories
code_dir: downloads/code
i18n_dir: :lang
skip_render:

#hexo-renderer-marked
#marked:
# prependRoot: true
# postAsset: true
#hexo-renderer-markdown-it
markdown:
 render:
 html: true
 xhtmlOut: false
 breaks: true
 linkify: true
 typographer: true
 quotes: '“”‘’'
 plugins:
 - markdown-it-katex
 images:
 lazyload: true
 prepend_root: true
 post_asset: true
# Writing
new_post_name: :title.md # File name of new posts
default_layout: post
titlecase: false # Transform title into titlecase
external_link:
 enable: true # Open external links in new tab
 field: site # Apply to the whole site
 exclude: ''
filename_case: 0
render_drafts: false
post_asset_folder: true
relative_link: false
future: true
syntax_highlighter: highlight.js
highlight:
 line_number: true
 auto_detect: false
 tab_replace: ''
 wrap: true
 hljs: false
prismjs:
 preprocess: true
 line_number: true
 tab_replace: ''

# Home page setting
# path: Root path for your blogs index page. (default = '')
# per_page: Posts displayed per page. (0 = disable pagination)
# order_by: Posts order. (Order by date descending by default)
index_generator:
 path: ''
 per_page: 10
 order_by: -date

# Category & Tag
default_category: uncategorized
category_map:
tag_map:

# Metadata elements
## https://developer.mozilla.org/en-US/docs/Web/HTML/Element/meta
meta_generator: true

# Date / Time format
## Hexo uses Moment.js to parse and display date
## You can customize the date format as defined in
## http://momentjs.com/docs/#/displaying/format/
date_format: YYYY-MM-DD
time_format: HH:mm:ss
## updated_option supports 'mtime', 'date', 'empty'
updated_option: 'mtime'

# Pagination
## Set per_page to 0 to disable pagination
per_page: 10
pagination_dir: page

# Include / Exclude file(s)
## include:/exclude: options only apply to the 'source/' folder
include:
exclude:
ignore:

# Extensions
## Plugins: https://hexo.io/plugins/
## Themes: https://hexo.io/themes/
theme: next

# Deployment
## Docs: https://hexo.io/docs/one-command-deployment
deploy:
 type: ''

```

### NexT Configuration

```yml
请看上述说明
```

## Other Information 
debian12系统、edge浏览器

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hexo-renderer-markdown-it渲染器渲染数学公式有问题 #1749

Issue Checklist

Expected behavior

Actual behavior

Steps to reproduce the behavior

Environment Information

Node.js and NPM Information

Package dependencies Information

Hexo Configuration

NexT Configuration

Other Information

Metadata

Assignees

Labels

Type

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Development

hexo-renderer-markdown-it渲染器渲染数学公式有问题 #1749

Description

Issue Checklist

Expected behavior

Actual behavior

Steps to reproduce the behavior

Environment Information

Node.js and NPM Information

Package dependencies Information

Hexo Configuration

NexT Configuration

Other Information

Metadata

Metadata

Assignees

Labels

Type

Projects

Milestone

Relationships

Development

Issue actions