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/trust/index.html

@@ -61,7 +61,7 @@
     li { margin-bottom: 6px; }
     .row { display: flex; align-items: flex-start; gap: 12px; padding: 12px 0; border-bottom: 0.5px solid var(--separator); }
     .row:last-child { border-bottom: none; }
-    .row-icon { width: 36px; height: 36px; border-radius: 8px; display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
+    .row-icon { width: 36px; height: 36px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
     .blue { background: rgba(0,102,255,0.12); }
     .green { background: rgba(52,199,89,0.12); }
     .orange { background: rgba(255,149,0,0.12); }
@@ -80,7 +80,7 @@
     .stat-lbl { font-size: 12px; color: var(--label3); margin-top: 3px; }
     .chain-step { display: flex; align-items: flex-start; gap: 12px; padding: 10px 0; border-bottom: 0.5px solid var(--separator); }
     .chain-step:last-child { border-bottom: none; }
-    .chain-num { width: 28px; height: 28px; border-radius: 50%; background: rgba(0,102,255,0.12); color: var(--accent); font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px; }
+    .chain-num { width: 28px; height: 28px; border-radius: var(--radius-full); background: rgba(0,102,255,0.12); color: var(--accent); font-size: 13px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 2px; }
     .chain-content { flex: 1; }
     .chain-label { font-size: 14px; font-weight: 600; color: var(--label); }
     .chain-sub { font-size: 13px; color: var(--label3); margin-top: 2px; line-height: 1.5; }