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/_closeButton.scss

@@ -0,0 +1,26 @@
+.#{$rt-namespace}__close-button {
+  color: #fff;
+  background: transparent;
+  outline: none;
+  border: none;
+  padding: 0;
+  cursor: pointer;
+  opacity: 0.7;
+  transition: 0.3s ease;
+  align-self: flex-start;
+  
+  &--default {
+    color: #000;
+    opacity: 0.3;
+  }
+
+  & > svg {
+    fill: currentColor;
+    height: 16px;
+    width: 14px;
+  }
+
+  &:hover, &:focus {
+    opacity: 1;
+  }
+}