flutter_html 3.0 does not auto-launch links — without an onLinkTap callback, all anchor taps are silently dropped. Wire up launchUrl with LaunchMode.externalApplication in both EmailDetailScreen (_SafeHtml) and ThreadDetailScreen so every link in an HTML email body opens in the user's preferred browser rather than doing nothing. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>