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/chart.js/dist/helpers/helpers.interpolation.d.ts

@@ -0,0 +1,22 @@
+import type { Point, SplinePoint } from '../types/geometric.js';
+/**
+ * @private
+ */
+export declare function _pointInLine(p1: Point, p2: Point, t: number, mode?: any): {
+    x: number;
+    y: number;
+};
+/**
+ * @private
+ */
+export declare function _steppedInterpolation(p1: Point, p2: Point, t: number, mode: 'middle' | 'after' | unknown): {
+    x: number;
+    y: number;
+};
+/**
+ * @private
+ */
+export declare function _bezierInterpolation(p1: SplinePoint, p2: SplinePoint, t: number, mode?: any): {
+    x: number;
+    y: number;
+};