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/date-fns/esm/_lib/startOfUTCWeek/index.js

@@ -0,0 +1,24 @@
+import toInteger from "../toInteger/index.js";
+import toDate from "../../toDate/index.js";
+import requiredArgs from "../requiredArgs/index.js"; // This function will be a part of public API when UTC function will be implemented.
+// See issue: https://github.com/date-fns/date-fns/issues/376
+
+export default function startOfUTCWeek(dirtyDate, dirtyOptions) {
+  requiredArgs(1, arguments);
+  var options = dirtyOptions || {};
+  var locale = options.locale;
+  var localeWeekStartsOn = locale && locale.options && locale.options.weekStartsOn;
+  var defaultWeekStartsOn = localeWeekStartsOn == null ? 0 : toInteger(localeWeekStartsOn);
+  var weekStartsOn = options.weekStartsOn == null ? defaultWeekStartsOn : toInteger(options.weekStartsOn); // Test if weekStartsOn is between 0 and 6 _and_ is not NaN
+
+  if (!(weekStartsOn >= 0 && weekStartsOn <= 6)) {
+    throw new RangeError('weekStartsOn must be between 0 and 6 inclusively');
+  }
+
+  var date = toDate(dirtyDate);
+  var day = date.getUTCDay();
+  var diff = (day < weekStartsOn ? 7 : 0) + day - weekStartsOn;
+  date.setUTCDate(date.getUTCDate() - diff);
+  date.setUTCHours(0, 0, 0, 0);
+  return date;
+}