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/plugins/plugin.filler/filler.target.stack.d.ts

@@ -0,0 +1,14 @@
+/**
+ * @param {{ chart: Chart; scale: Scale; index: number; line: LineElement; }} source
+ * @return {LineElement}
+ */
+export function _buildStackLine(source: {
+    chart: Chart;
+    scale: Scale;
+    index: number;
+    line: LineElement;
+}): LineElement;
+export type Chart = import('../../core/core.controller.js').default;
+export type Scale = import('../../core/core.scale.js').default;
+export type PointElement = import('../../elements/element.point.js').default;
+import { LineElement } from "../../elements/index.js";