fix: align markdown preview with renderer config

[jiangmuran]

Summary

• align markdown preview plugin order with backend renderer
• align linkify configuration for consistent preview rendering

Related Issues

• closes 题面Markdown预览的渲染和网页实际渲染不一致 #1120

Testing

• not run (frontend-only change)

Summary by CodeRabbit

• Bug Fixes
  • Resolved duplicate plugin registrations in the markdown editor.
  • Enabled LaTeX/KaTeX support for mathematical expressions in Markdown content.
  • Adjusted plugin initialization order for improved performance.

[coderabbitai]

Walkthrough

This pull request modifies the Markdown-it editor plugin configuration in a single file. It removes linkify exceptions for .zip and .mov file extensions, reorders the plugin initialization sequence by placing the Imsize plugin earlier in the list (before Footnote), explicitly adds the katex plugin, and eliminates duplicate plugin registrations for both Imsize and katex. The total change is 2 lines added and 4 lines removed.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'fix: align markdown preview with renderer config' directly describes the main objective of the PR - aligning the markdown preview with the backend renderer configuration.
Linked Issues check	✅ Passed	The PR addresses issue #1120 by adjusting plugin order and linkify configuration in the markdown editor to match the backend renderer, directly resolving the rendering consistency problem documented in the issue.
Out of Scope Changes check	✅ Passed	All changes are scoped to the mdeditor.ts plugin configuration and directly address the linked issue about markdown preview consistency with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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