fix: add noopener to external chat markdown links

[sabraman]

Summary

• add noopener alongside noreferrer for external links rendered by ChatMarkdown

Why

Markdown links that do not resolve to local file targets open in a new tab from ChatMarkdown, but they were the only new-tab links in the repo still using rel="noreferrer" alone. The rest of the app and marketing site consistently use rel="noopener noreferrer" for that pattern.

Verification

• bun fmt
• bun lint
• bun typecheck

Note

Add noopener to external links in chat markdown renderer

Updates the a renderer in ChatMarkdown.tsx to include rel="noopener noreferrer" (previously only noreferrer) on external links opened in a new tab. This prevents the new page from accessing window.opener on the source tab.

^{Macroscope summarized da0bc1e.}

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