fix: handle CR in rules to follow CommonMark spec

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

Which language are you using?

CommonMark and GFM.

What did you do?

@eslint/markdown is unable to detect CR line endings in certain rules.

What did you expect to happen?

I expect CR line endings to be recognized as valid line endings throughout the Markdown rules.

According to the Markdown(CommonMark) specification, LF, CR, and CRLF can all be used for line endings.

https://spec.commonmark.org/0.31.2/#line-ending

What changes did you make? (Give an overview)

This PR is follow-up to #554 and #555.

In this PR, I've updated the no-reversed-media-syntax rule to recognize CR line endings as a valid line break pattern.

I've also refactored the no-html and no-reference-like-urls rules, and added some additional comments to each file.

Related Issues

Refs: #554, #555, #491 (comment)

Is there anything you'd like reviewers to focus on?

N/A

[lumirlumir]

For a complete fix, #376 is a prerequisite, as some internal rules are closely tied to self-implemented line break logic.

[lumirlumir]

It looks like the newly released Bun 1.3 now enforces strict dependencies in package.json. If we use transitive dependencies like @types/unist, @types/mdast, or semver, it throws errors:

• Bun v1.3: https://github.com/oven-sh/bun/releases/tag/bun-v1.3.0

• https://github.com/eslint/markdown/actions/runs/18428303631/job/52512384911

• https://github.com/eslint/markdown/actions/runs/18428377164/job/52512542729

So, I've added @types/unist, @types/mdast, and semver to the dev dependencies.

[lumirlumir]

This rule already supports CR line endings, so I only refactored the code.

[lumirlumir]

Motivated by #525, I've simplified the regex a bit.

Since imageBang and title can be retrieved directly from the node's information, I've updated the code to access them directly from the nodes.

(This rule already supports CR line endings, so I only refactored the code.)