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/coverage/index.html

@@ -46,7 +46,7 @@
       letter-spacing: -0.3px;
       color: #1d1d1f; text-decoration: none; letter-spacing: -0.3px; }
     .nav-links { display: flex; list-style: none; gap: 8px; align-items: center; }
-    .nav-links a { color: var(--text-dim); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: 6px; transition: color 0.2s; }
+    .nav-links a { color: var(--text-dim); text-decoration: none; font-size: 14px; padding: 6px 10px; border-radius: var(--radius-sm); transition: color 0.2s; }
     .nav-links a:hover { color: #1d1d1f; }
     .nav-dropdown { position: relative; }
     .nav-dropdown > a::after { content: " "; display: inline-block; border: 4px solid transparent; border-top-color: currentColor; margin-left: 4px; vertical-align: 2px; transition: transform 0.2s; }
@@ -56,7 +56,7 @@
     .nav-dropdown-menu a:hover { color: #1d1d1f; background: rgba(0,0,0,0.03); }
     .nav-dropdown-menu .dd-label { font-size: 11px; font-weight: 600; text-transform: uppercase; letter-spacing: 0.08em; color: var(--text-muted); padding: 8px 16px 4px; }
     .nav-dropdown-menu hr { border: none; border-top: 1px solid var(--border); margin: 6px 0; }
-    .btn { display: inline-flex; align-items: center; gap: 6px; background: var(--blue); color: #1d1d1f; font-size: 14px; font-weight: 600; padding: 9px 18px; border-radius: 8px; text-decoration: none; border: none; cursor: pointer; transition: background 0.2s, transform 0.15s; font-family: inherit; }
+    .btn { display: inline-flex; align-items: center; gap: 6px; background: var(--blue); color: #1d1d1f; font-size: 14px; font-weight: 600; padding: 9px 18px; border-radius: var(--radius-md); text-decoration: none; border: none; cursor: pointer; transition: background 0.2s, transform 0.15s; font-family: inherit; }
     .btn:hover { background: var(--blue-dark); transform: translateY(-1px); }
     .btn-outline { background: transparent; border: 1.5px solid rgba(0,0,0,0.2); }
     .btn-outline:hover { background: rgba(0,0,0,0.04); }
@@ -94,7 +94,7 @@
     .freshness-table td { padding: 14px 16px; font-size: 14px; color: var(--text-dim); border-bottom: 1px solid var(--border); }
     .freshness-table tr:last-child td { border-bottom: none; }
     .freshness-table .tier { font-weight: 600; color: var(--text); }
-    .badge { display: inline-block; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 600; }
+    .badge { display: inline-block; padding: 3px 10px; border-radius: var(--radius-xl); font-size: 12px; font-weight: 600; }
     .badge-standard { background: rgba(0,0,0,0.08); color: var(--text-dim); }
     .badge-premium { background: rgba(0,102,255,0.12); color: #5fa8ff; }
     .badge-realtime { background: rgba(52,199,89,0.12); color: var(--green); }