add expo app

apps/mobile/components/EditScreenInfo.tsx

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+import React from 'react';
+import { StyleSheet } from 'react-native';
+
+import { ExternalLink } from './ExternalLink';
+import { MonoText } from './StyledText';
+import { Text, View } from './Themed';
+import Colors from '../constants/Colors';
+
+export default function EditScreenInfo({ path }: { path: string }) {
+  return (
+    <View>
+      <View style={styles.getStartedContainer}>
+        <Text
+          style={styles.getStartedText}
+          lightColor="rgba(0,0,0,0.8)"
+          darkColor="rgba(255,255,255,0.8)"
+        >
+          Open up the code for this screen:
+        </Text>
+
+        <View
+          style={[styles.codeHighlightContainer, styles.homeScreenFilename]}
+          darkColor="rgba(255,255,255,0.05)"
+          lightColor="rgba(0,0,0,0.05)"
+        >
+          <MonoText>{path}</MonoText>
+        </View>
+
+        <Text
+          style={styles.getStartedText}
+          lightColor="rgba(0,0,0,0.8)"
+          darkColor="rgba(255,255,255,0.8)"
+        >
+          Change any of the text, save the file, and your app will automatically
+          update.
+        </Text>
+      </View>
+
+      <View style={styles.helpContainer}>
+        <ExternalLink
+          style={styles.helpLink}
+          href="https://docs.expo.io/get-started/create-a-new-app/#opening-the-app-on-your-phonetablet"
+        >
+          <Text style={styles.helpLinkText} lightColor={Colors.light.tint}>
+            Tap here if your app doesn&apos;t automatically update after making
+            changes
+          </Text>
+        </ExternalLink>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  getStartedContainer: {
+    alignItems: 'center',
+    marginHorizontal: 50,
+  },
+  homeScreenFilename: {
+    marginVertical: 7,
+  },
+  codeHighlightContainer: {
+    borderRadius: 3,
+    paddingHorizontal: 4,
+  },
+  getStartedText: {
+    fontSize: 17,
+    lineHeight: 24,
+    textAlign: 'center',
+  },
+  helpContainer: {
+    marginTop: 15,
+    marginHorizontal: 20,
+    alignItems: 'center',
+  },
+  helpLink: {
+    paddingVertical: 15,
+  },
+  helpLinkText: {
+    textAlign: 'center',
+  },
+});

apps/mobile/components/ExternalLink.tsx

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+import { Link } from 'expo-router';
+import * as WebBrowser from 'expo-web-browser';
+import React from 'react';
+import { Platform } from 'react-native';
+
+export function ExternalLink(
+  props: Omit<React.ComponentProps<typeof Link>, 'href'> & { href: string },
+) {
+  return (
+    <Link
+      hrefAttrs={{
+        // On web, launch the link in a new tab.
+        target: '_blank',
+      }}
+      {...props}
+      // @ts-expect-error: External URLs are not typed.
+      href={props.href}
+      onPress={(e) => {
+        if (Platform.OS !== 'web') {
+          // Prevent the default behavior of linking to the default browser on native.
+          e.preventDefault();
+          // Open the link in an in-app browser.
+          WebBrowser.openBrowserAsync(props.href as string);
+        }
+      }}
+    />
+  );
+}

apps/mobile/components/StyledText.tsx

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+import { Text, TextProps } from './Themed';
+
+export function MonoText(props: TextProps) {
+  return <Text {...props} style={[props.style, { fontFamily: 'SpaceMono' }]} />;
+}

apps/mobile/components/Themed.tsx

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+/**
+ * Learn more about Light and Dark modes:
+ * https://docs.expo.io/guides/color-schemes/
+ */
+
+import {
+  Text as DefaultText,
+  View as DefaultView,
+  useColorScheme,
+} from 'react-native';
+
+import Colors from '../constants/Colors';
+
+type ThemeProps = {
+  lightColor?: string;
+  darkColor?: string;
+};
+
+export type TextProps = ThemeProps & DefaultText['props'];
+export type ViewProps = ThemeProps & DefaultView['props'];
+
+export function useThemeColor(
+  props: { light?: string; dark?: string },
+  colorName: keyof typeof Colors.light & keyof typeof Colors.dark,
+) {
+  const theme = useColorScheme() ?? 'light';
+  const colorFromProps = props[theme];
+
+  if (colorFromProps) {
+    return colorFromProps;
+  }
+  return Colors[theme][colorName];
+}
+
+export function Text(props: TextProps) {
+  const { style, lightColor, darkColor, ...otherProps } = props;
+  const color = useThemeColor({ light: lightColor, dark: darkColor }, 'text');
+
+  return <DefaultText style={[{ color }, style]} {...otherProps} />;
+}
+
+export function View(props: ViewProps) {
+  const { style, lightColor, darkColor, ...otherProps } = props;
+  const backgroundColor = useThemeColor(
+    { light: lightColor, dark: darkColor },
+    'background',
+  );
+
+  return <DefaultView style={[{ backgroundColor }, style]} {...otherProps} />;
+}