fix: named code block escape

[claustra01]

No description provided.

[Copilot]

Pull request overview

This PR replaces the markdown-it-named-code-blocks dependency with a small in-repo compatible renderer override that supports “language:filename” fenced code blocks while safely escaping the filename before rendering HTML.

Changes:

• Added a local namedCodeBlocks markdown-it plugin that wraps fenced code blocks with filename markup and escapes filenames via md.utils.escapeHtml.
• Updated the markdown-it setup to use the new local plugin implementation.
• Removed markdown-it-named-code-blocks from package.json and cleaned up package-lock.json accordingly.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
plugins/namedcodeblocks.js	Introduces the local replacement plugin; strips filename from token.info, renders filename safely, and wraps the rendered fence output.
plugins/markdownit.js	Switches the markdown-it plugin import to the new local implementation and continues registering it via md.use(...).
package.json	Removes the markdown-it-named-code-blocks dependency.
package-lock.json	Removes markdown-it-named-code-blocks and its transitive dependencies from the lockfile.

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