docs: add web workers browser compatibility tips

[9aoy]

Summary

When bundle page with Web Workers, the entry mode is not applicable to Web Workers because the Web Workers thread is isolated from the main thread (page), and the usage mode can be used at this time.

export default {
  output: {
    polyfill: 'usage',
  },
};

Related Links

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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[Copilot]

Pull Request Overview

This PR adds documentation about browser compatibility considerations when using Web Workers with polyfills. It explains that the entry polyfill mode doesn't work with Web Workers due to thread isolation, and recommends using the usage mode instead.

• Adds browser compatibility sections to both English and Chinese Web Workers documentation
• Includes tip boxes in polyfill configuration documentation explaining the Web Workers limitation
• Provides code examples showing how to configure the usage polyfill mode

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
website/docs/zh/guide/basic/web-workers.mdx	Adds Chinese browser compatibility section with explanation and config example
website/docs/en/guide/basic/web-workers.mdx	Adds English browser compatibility section with explanation and config example
website/docs/zh/config/output/polyfill.mdx	Adds Chinese tip about Web Workers polyfill limitation
website/docs/en/config/output/polyfill.mdx	Adds English tip about Web Workers polyfill limitation

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[chenjiahan]

LGTM