feat: support Math in Markdown

[lumirlumir]

Prerequisites checklist

• I have read the contributing guidelines.

What is the purpose of this pull request?

This PR updates Code Explorer to support the Math parsing option for the Markdown language, introduced in eslint/markdown#617 and released as part of @eslint/markdown v8.

I've also updated e2e-tests/options.test.ts to include tests for the newly added Math option.

What changes did you make? (Give an overview)

• Before:

• After:

Related Issues

Ref: eslint/markdown#331

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

Actually, adding AST node interaction and expansion tests would make this feature more robust, but there are currently no tests for those cases. I’d like to continue the work on #398, since it requires many of the changes.

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[jookira]

@lumirlumir, I wanted to share some constructive feedback on your PRs:

1. I’ve noticed that refactors and fixes/features are sometimes combined in the same PR. Splitting these into separate PRs would make the logic changes easier to review and merge.
2. Tasks like this one seem to be taking a few hours, where I’d expect something closer to ~30 minutes. I’d suggest utilizing AI tools for the boilerplate and tests to help speed things up.

[Copilot]

Pull request overview

Adds support in Code Explorer for the new math parsing option in the Markdown language (introduced in @eslint/markdown v8), including a UI toggle and an e2e test update.

Changes:

• Add a new markdownMath boolean option (type + default) and expose it in the Markdown options panel.
• Pass math through to @eslint/markdown’s parser via languageOptions.
• Bump @eslint/markdown to ^8.0.1 and extend the e2e options-panel test to assert the new switch is visible.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/lib/const.ts	Adds markdownMath to the default Markdown options.
src/hooks/use-explorer.ts	Extends MarkdownOptions to include markdownMath.
src/hooks/use-ast.ts	Wires markdownMath into the markdown parser languageOptions.
src/components/options.tsx	Adds a new “Math” switch to the Markdown options UI.
package.json	Updates @eslint/markdown dependency to v8.
package-lock.json	Lockfile updates for @eslint/markdown@8 and its transitive deps/engines.
e2e-tests/options.test.ts	Adds an assertion that the “Math” switch is visible for Markdown.

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[lumirlumir]

Just refactored the test helper code a bit to follow the existing convention:

code-explorer/e2e-tests/persistence.test.ts

Lines 17 to 27 in ef5285f

	async function getPersistedJavaScriptCode(page: Page): Promise<string> {
	return page.evaluate(key => {
	const storedValue = window.localStorage.getItem(key);
	if (!storedValue) {
	return "";
	}
	return JSON.parse(storedValue).state.code.javascript;
	}, storageKey);
	}

code-explorer/e2e-tests/persistence.test.ts

Lines 42 to 48 in ef5285f

	async function getStoredHashValue(page: Page): Promise<string> {
	return page.evaluate(key => {
	return (
	new URLSearchParams(window.location.hash.slice(1)).get(key) ?? ""
	);
	}, storageKey);
	}

[DMartens]

Changes LGTM, thanks.