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/text-hex/test.js

@@ -0,0 +1,11 @@
+describe('text-hex', function () {
+  'use strict';
+
+  var assume = require('assume')
+    , hex = require('./');
+
+  it('is a 6 digit hex', function () {
+    assume(hex('a')).to.have.length(7); // including a #
+    assume(hex('a244fdafadfa4 adfau8fa a u adf8a0')).to.have.length(7);
+  });
+});