docs: more S2 docs fixes

[reidbarber]

• Remove Element assumption from client focus listener (prevents .closest() does not exist error shown in dev if parcel error overlay was focused)
• Added clipboard copy feedback + message to Illustrations search (same as we have for Icons)
• Updated search placeholder to change to 'Search Icons' when Icons tag is selected.
• Silently handle prefetch failures (prevents error message in dev when hovering links that 404)
• Fix anchor links
• Don't clear search menu field when switching library tabs
• Fix anchor links on page load
• Renders version number in cards for releases

✅ Pull Request Checklist:

• Included link to corresponding React Spectrum GitHub Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Project:

[rspbot]

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[LFDanLu]

just gonna push the same fix for the focus visible style, but otherwise looks good to me

[rspbot]

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[snowystinger]

Looks like something might have broken the table of contents links?
https://reactspectrum.blob.core.windows.net/reactspectrum/7cf24e022834598d130e941439144bb745377f4d/s2-docs/s2/getting-started.html#overriding-the-color-scheme
this won't scroll to the right section

[reidbarber]

@snowystinger looks like it broke in #9159. I'll investigate and try to fix it here.

[rspbot]

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[snowystinger]

Within a page it works now, but if I go to the link https://reactspectrum.blob.core.windows.net/reactspectrum/48baa8fe5656319c071543aae80dd477fdaa798d/s2-docs/s2/getting-started.html#optimizing-full-page-apps in a new page, it won't scroll to the right position, i'm ok fixing in followup

[rspbot]

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[rspbot]

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• View the storybook
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• View the S2 docs

[rspbot]

Build successful! 🎉

• View the storybook
• View the S2 storybook
• View the documentation
• View the S2 docs