Native UI patterns with Expo Router

Description

Build and review native-feeling Expo Router app UI — route and folder structure, layouts with Stack, Tabs and NativeTabs, stacks nested inside tabs, headers, large titles, search bars and toolbars, modals and form sheets, dynamic routes and typed params, links and redirects, protected routes, scroll views with automatic content insets, safe areas, platform-native controls and icons (expo-image SF Symbols, haptics, blur and glass effects), choosing between React Native components, @expo/ui native SwiftUI/Jetpack Compose components, and Expo DOM components ('use dom') for web-only libraries, plus modern library choices (expo-image, expo-audio, expo-video). Use whenever the user builds screens, navigation, tabs, headers, sheets, or UI in an Expo Router app, wants it to feel native on iOS/Android, or reviews Expo UI code.