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/node_modules/react-toastify/scss/animations/_zoom.scss

@@ -0,0 +1,30 @@
+@keyframes #{$rt-namespace}__zoomIn {
+    from {
+        opacity: 0;
+        transform: scale3d(0.3, 0.3, 0.3);
+    }
+    50% {
+        opacity: 1;
+    }
+}
+
+@keyframes #{$rt-namespace}__zoomOut {
+    from {
+        opacity: 1;
+    }
+    50% {
+        opacity: 0;
+        transform: scale3d(0.3, 0.3, 0.3);
+    }
+    to {
+        opacity: 0
+    }
+}
+
+.#{$rt-namespace}__zoom-enter {
+    animation-name: #{$rt-namespace}__zoomIn;
+}
+
+.#{$rt-namespace}__zoom-exit {
+    animation-name: #{$rt-namespace}__zoomOut;
+}