/**
 * App.tsx – legacy root component (not the active entry point).
 *
 * The app uses expo-router as its entry point ("main": "expo-router/entry"
 * in package.json).  Routing, authentication, and navigation are all handled
 * by the file-based routes in the `app/` directory.
 *
 * This file is retained for reference only and is not executed at runtime.
 */