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/contradiction-gap/index.html

@@ -42,7 +42,7 @@
     .breadcrumb a:hover { text-decoration: underline; }
     .breadcrumb-sep { color: var(--text-muted); }
     .article-meta { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
-    .category-badge { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--blue); background: var(--blue-light); border-radius: 6px; padding: 3px 9px; }
+    .category-badge { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--blue); background: var(--blue-light); border-radius: var(--radius-sm); padding: 3px 9px; }
     .article-date { font-size: 13px; color: var(--text-muted); font-weight: 500; }
     h1 { font-size: clamp(1.7rem, 4vw, 2.4rem); font-weight: 700; letter-spacing: -0.04em; line-height: 1.2; color: var(--text-primary); margin-bottom: 20px; }
     .article-lead { font-size: 18px; color: var(--text-secondary); line-height: 1.7; margin-bottom: 40px; padding-bottom: 32px; border-bottom: 1px solid var(--border); }