feat: Passwordless cross-device authentication

- Arkitektur: docs/auth/passwordless-architecture.md
- Backend: iom/quixzoom-auth-service/ (FastAPI + Redis)
- Webb: quixzoom-market-pages/se/login/ (QR-kod + polling)
- App: iom/quixzoom-app/src/features/auth/ (push + deep links)

Flöde: QR-kod → app-godkännande → webb-inloggad

landvex-site/responsible-disclosure/index.html

@@ -139,7 +139,7 @@
     .footer-links { display: flex; gap: 24px; align-items: center; flex-wrap: wrap; }
     .footer-links a { font-size: 14px; color: var(--text-muted); transition: color 0.2s; }
     .footer-links a:hover { color: #1d1d1f; }
-    .footer-social { width: 32px; height: 32px; border: 1px solid var(--border); border-radius: 8px; display: flex; align-items: center; justify-content: center; transition: border-color 0.2s, background 0.2s; }
+    .footer-social { width: 32px; height: 32px; border: 1px solid var(--border); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; transition: border-color 0.2s, background 0.2s; }
     .footer-social:hover { border-color: rgba(0,0,0,0.25); background: rgba(0,0,0,0.04); }
 
     @media (max-width: 900px) { nav { padding: 0 16px; } .nav-links { display: none; } .sla-grid { grid-template-columns: 1fr 1fr; } }