border-l-4 semantic strip, bg-paper, Lucide icons at size=16. ARIA role="alert" for error/warn, role="status" for success/info. No shadow, no radius, no transition. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
border-l-4 semantic strip, bg-paper, Lucide icons at size=16. ARIA role="alert" for error/warn, role="status" for success/info. No shadow, no radius, no transition. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>