Incorrectly ignores single-line code blocks when escaping Swig and HTML comments

[D-Sketon]

Check List

• [x] I have already read Docs page & Troubleshooting page.
• [x] I have already searched existing issues and they are not help to me.
• [x] I examined error or warning messages and it's difficult to solve.
• [x] I am using the latest version of Hexo. (run hexo version to check)
• [x] My Node.js is matched the required version.

Expected behavior

ref: https://github.com/hexojs/hexo/issues/5716#issuecomment-3479388663

Since v8.1.0, `<!--test-->` has been incorrectly rendered as <code><!--test--></code>. It should be rendered as <code>&lt;!--test--&gt;</code>.

[yoshinorin]

I tested with hexo g on both Hexo 7.3.0 and 8.1.1, and both versions correctly rendered the output as <code>&lt;!--test--&gt;</code>.

Before reviewing the PR, I believe we should clarify the reproduction conditions, including:

• Which renderer is being used
• Renderer configuration
• The actual Markdown content that triggers the issue (if possible)

@chanwj Could you provide these details to help us reproduce the issue if possible?

[D-Sketon]

@yoshinorin Your post needs to include the swig tag because the current logic does not trigger the escape process when the swig tag is absent. e.g.

{{ 1 }}
`<!-- comment -->`

[chanwj]

@chanwj Could you provide these details to help us reproduce the issue if possible?

@yoshinorin Sure, I will post my use case below.

• Post's markdown file:

{% timeline 2025 %}

<!-- timeline 0625 -->

Any Content.

<!-- endtimeline -->

{% endtimeline %}

Every timeline block content should be written between `<!-- timeline title -->` and `<!-- endtimeline -->`.

[yoshinorin]

@D-Sketon @chanwj Thank you. I understand now. I've commented on the PR.