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/docs/Interval.js

@@ -0,0 +1,16 @@
+/**
+ * @category Types
+ * @summary An object that combines two dates to represent the time interval.
+ *
+ * @description
+ * An object that combines two dates to represent the time interval.
+ *
+ * @typedef {Object} Interval
+ * @property {Date|Number} start - the start of the interval
+ * @property {Date|Number} end - the end of the interval
+ * @throws {RangeError} The start of an interval cannot be after its end
+ * @throws {RangeError} Date in interval cannot be `Invalid Date`
+ */
+var Interval = {}
+
+module.exports = Interval