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/_flip.scss

@@ -0,0 +1,43 @@
+@keyframes #{$rt-namespace}__flipIn {
+    from {
+        transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
+        animation-timing-function: ease-in;
+        opacity: 0;
+    }
+    40% {
+        transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
+        animation-timing-function: ease-in;
+    }
+    60% {
+        transform: perspective(400px) rotate3d(1, 0, 0, 10deg);
+        opacity: 1
+    }
+    80% {
+        transform: perspective(400px) rotate3d(1, 0, 0, -5deg);
+    }
+    to {
+        transform: perspective(400px);
+    }
+}
+
+@keyframes #{$rt-namespace}__flipOut {
+    from {
+        transform: perspective(400px);
+    }
+    30% {
+        transform: perspective(400px) rotate3d(1, 0, 0, -20deg);
+        opacity: 1
+    }
+    to {
+        transform: perspective(400px) rotate3d(1, 0, 0, 90deg);
+        opacity: 0
+    }
+}
+
+.#{$rt-namespace}__flip-enter {
+    animation-name: #{$rt-namespace}__flipIn;
+}
+
+.#{$rt-namespace}__flip-exit {
+    animation-name: #{$rt-namespace}__flipOut;
+}