Nuggets: optional link (e.g. YouTube) on host profiles; v2.47.0

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/helpers.js

@@ -402,6 +402,8 @@ function sanitizeNuggets(raw) {
           role: typeof h.role === 'string' ? h.role.trim().slice(0, 120) : '',
           bio: typeof h.bio === 'string' ? h.bio.trim().slice(0, 4000) : '',
           imageUrl: sanitizeUrl(h.imageUrl) || '',
+          linkUrl: sanitizeUrl(h.linkUrl) || '',
+          linkLabel: typeof h.linkLabel === 'string' ? h.linkLabel.trim().slice(0, 80) : '',
           archived: Boolean(h.archived),
         }))
     : []