Open external db reference links in a new tab

Details

External links rendered from Supabase section content (publications,
awards, experience, etc.) navigated in the same tab, while the
hand-authored hero/footer external links open in a new tab. The markdown
renderer doesn't emit target/rel, so visitors following an arXiv / Scholar
/ university reference were taken off the site.
Apply target=_blank rel=noopener to resolved external db links (masked
document links are unaffected), matching the established hero/footer
pattern. Verified offline: 102/102 external section links now open in a
new tab; masked links and the document viewer flow unchanged.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Pn8V4h9YWbjYzdSrDiLiVL

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