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/moment-timezone/.editorconfig

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+root = true
+
+[*]
+indent_style = tab
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.min.js]
+insert_final_newline = false
+
+# It's not ideal to have 2 different styles, but this is just codifying what
+# already existed in the project.
+[*.{md,ts}]
+indent_style = space
+
+# Standard style for GitHub workflow files
+[*.yml]
+indent_style = space
+indent_size = 2