fix: Dollar Sign Handling in Markdown

[Riddhimaan-Senapati]

Summary

Fix Dollar Sign Handling in Markdown, fixes #13149.

Problem

Regular text containing dollar signs (e.g., currency values like "$29 and $199") was being incorrectly interpreted as LaTeX math expressions, causing rendering issues in the markdown output.

Solution

Added the singleDollarTextMath: false option to the RemarkMath plugin configuration. This ensures that:

• Single dollar signs ($) are treated as regular text characters
• Only double dollar signs ($$) or explicit LaTeX delimiters ([...] and (...)) will trigger math expression rendering

Impact

• Currency values and other text containing dollar signs will now display correctly
• LaTeX math expressions continue to work as expected when properly delimited

Screenshots

Before	After

Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods

[Riddhimaan-Senapati]

@tomoyuki28jp @rainchen @iwaim @gijigae @crazywoola Can anyone of you review my PR? Excited to begin contributing to the repo.

[crazywoola]

Still got this output and there are 2 lint errors.

Unexpected parentheses around single function argument having a body with no curly braces.
Unexpected parentheses around single function argument having a body with no curly braces.

[Riddhimaan-Senapati]

@crazywoola I updated the PR, turns out the issue was not in the preprocessing but the rendering. I have simply added the singleDollarTextMath: false option to the RemarkMath plugin configuration. I also used npm install, and for some reason it updated the yarn.lock file as well so that's where most of the changes are coming from. But other than that, it is a one-line change.

But now can you test it again, I am having some issues from my end testing it.

[crazywoola]

@crazywoola I updated the PR, turns out the issue was not in the preprocessing but the rendering. I have simply added the singleDollarTextMath: false option to the RemarkMath plugin configuration. I also used npm install, and for some reason it updated the yarn.lock file as well so that's where most of the changes are coming from. But other than that, it is a one-line change.

But now can you test it again, I am having some issues from my end testing it.

You can revert the yarn.lock. Please leave it to us to update the lockfile. :)