feat(site): add version switcher to header navigation

[Copilot]

Adds version switching UI to allow users to navigate between v1.x (current) and v0.x documentation at https://gpt-vis-0.x-site.antv.vision/.

Implementation

• Component: Created VersionSwitcher.tsx with dropdown menu

  • Click-outside-to-close behavior
  • Disabled state for current version with visual indicator
  • ARIA role="menu", aria-current, and screen reader announcements for external link

• Integration: Added to header navigation on all pages (home, docs, examples)

  • Positioned between GitHub link and Get Started button
  • Consistent placement across site

UI

Closed state:

Dropdown menu:

Files Changed

site/app/components/VersionSwitcher.tsx  (new)
site/app/page.tsx                        (import + integrate)
site/app/docs/page.tsx                   (import + integrate)
site/app/examples/page.tsx               (import + integrate)

Original prompt

官网 site 的 header 右侧 加一个版本切换的功能。默认 1.x 是当前站点，可以切换到 0.x 版本，地址为：https://gpt-vis-0.x-site.antv.vision/

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 3c03f6e

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

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