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/insights/decision-first-intelligence/index.html

@@ -29,7 +29,7 @@ h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 0.5em; line-height: 1.2
 h2 { font-size: 1.5rem; font-weight: 600; margin-top: 2em; margin-bottom: 0.5em; }
 p { margin-bottom: 1.2em; }
 .meta { color: #666; font-size: 0.9rem; margin-bottom: 2em; }
-.cta { background: #f5f5f5; padding: 24px; border-radius: 8px; margin: 2em 0; }
+.cta { background: #f5f5f5; padding: 24px; border-radius: var(--radius-md); margin: 2em 0; }
 .cta a { color: #0066cc; text-decoration: none; font-weight: 600; }
 footer { margin-top: 4em; padding-top: 2em; border-top: 1px solid #eee; font-size: 0.85rem; color: #666; }
 </style>