chore: update codemirror

[Pixel998]

Prerequisites checklist

• [x] I have read the contributing guidelines.

What is the purpose of this pull request?

This pull request migrates the codebase from the legacy CodeMirror 0.19.x packages to the stable CodeMirror v6 release.

What changes did you make? (Give an overview)

• Replaced deprecated packages (@codemirror/highlight, @codemirror/tooltip, @codemirror/panel, etc.) with their v6 equivalents.
• Removed redundant history/bracketMatching from CodeMirror setup. These are included by default.
• Enabled JSX in editor when ecmaFeatures.jsx is true
• Upgraded @uiw/react-codemirror from 4.5.1 → ^4.25.2.

Related Issues

Closes #760

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

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[lumirlumir]

There are merge conflicts now.

[lumirlumir]

Friendly ping @eslint/website-team and @eslint/eslint-team