Initialize Expo mobile app with tab navigation and monorepo support

- Expo managed project at apps/mobile/ with TypeScript
- Expo Router with 4 tabs: Map, Routes, Activities, Profile
- app.config.ts with monorepo experiment, bundle IDs, scheme
- Workspace packages linked: api, gpx, i18n, map-core, types
- Profile tab imports API_VERSION from @trails-cool/api to verify
  shared package resolution

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

apps/mobile/.gitignore

@@ -0,0 +1,41 @@
+# Learn more https://docs.github.com/en/get-started/getting-started-with-git/ignoring-files
+
+# dependencies
+node_modules/
+
+# Expo
+.expo/
+dist/
+web-build/
+expo-env.d.ts
+
+# Native
+.kotlin/
+*.orig.*
+*.jks
+*.p8
+*.p12
+*.key
+*.mobileprovision
+
+# Metro
+.metro-health-check*
+
+# debug
+npm-debug.*
+yarn-debug.*
+yarn-error.*
+
+# macOS
+.DS_Store
+*.pem
+
+# local env files
+.env*.local
+
+# typescript
+*.tsbuildinfo
+
+# generated native folders
+/ios
+/android

apps/mobile/app.config.ts

@@ -0,0 +1,36 @@
+import { ExpoConfig, ConfigContext } from "expo/config";
+
+export default ({ config }: ConfigContext): ExpoConfig => ({
+  ...config,
+  name: "trails.cool",
+  slug: "trails-cool",
+  version: "0.0.1",
+  scheme: "trailscool",
+  orientation: "portrait",
+  icon: "./assets/icon.png",
+  userInterfaceStyle: "light",
+  newArchEnabled: true,
+  splash: {
+    image: "./assets/splash-icon.png",
+    resizeMode: "contain",
+    backgroundColor: "#ffffff",
+  },
+  ios: {
+    supportsTablet: true,
+    bundleIdentifier: "cool.trails.app",
+  },
+  android: {
+    adaptiveIcon: {
+      foregroundImage: "./assets/adaptive-icon.png",
+      backgroundColor: "#ffffff",
+    },
+    package: "cool.trails.app",
+  },
+  web: {
+    favicon: "./assets/favicon.png",
+  },
+  experiments: {
+    monorepo: true,
+  },
+  plugins: ["expo-router"],
+});

apps/mobile/app/(tabs)/_layout.tsx

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+import { Tabs } from "expo-router";
+
+export default function TabLayout() {
+  return (
+    <Tabs
+      screenOptions={{
+        tabBarActiveTintColor: "#4A6B40",
+        headerShown: false,
+      }}
+    >
+      <Tabs.Screen
+        name="index"
+        options={{
+          title: "Map",
+          tabBarIcon: () => null,
+        }}
+      />
+      <Tabs.Screen
+        name="routes"
+        options={{
+          title: "Routes",
+          tabBarIcon: () => null,
+        }}
+      />
+      <Tabs.Screen
+        name="activities"
+        options={{
+          title: "Activities",
+          tabBarIcon: () => null,
+        }}
+      />
+      <Tabs.Screen
+        name="profile"
+        options={{
+          title: "Profile",
+          tabBarIcon: () => null,
+        }}
+      />
+    </Tabs>
+  );
+}

apps/mobile/app/(tabs)/activities.tsx

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+import { View, Text, StyleSheet } from "react-native";
+
+export default function ActivitiesScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.text}>Activities</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, justifyContent: "center", alignItems: "center" },
+  text: { fontSize: 18, color: "#666" },
+});

apps/mobile/app/(tabs)/index.tsx

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+import { View, Text, StyleSheet } from "react-native";
+
+export default function MapScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.text}>Map</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, justifyContent: "center", alignItems: "center" },
+  text: { fontSize: 18, color: "#666" },
+});

apps/mobile/app/(tabs)/profile.tsx

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+import { View, Text, StyleSheet } from "react-native";
+import { API_VERSION } from "@trails-cool/api";
+
+export default function ProfileScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.text}>Profile</Text>
+      <Text style={styles.version}>API v{API_VERSION}</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, justifyContent: "center", alignItems: "center" },
+  text: { fontSize: 18, color: "#666" },
+  version: { fontSize: 12, color: "#999", marginTop: 8 },
+});

apps/mobile/app/(tabs)/routes.tsx

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+import { View, Text, StyleSheet } from "react-native";
+
+export default function RoutesScreen() {
+  return (
+    <View style={styles.container}>
+      <Text style={styles.text}>Routes</Text>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  container: { flex: 1, justifyContent: "center", alignItems: "center" },
+  text: { fontSize: 18, color: "#666" },
+});

apps/mobile/app/_layout.tsx

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+import { Stack } from "expo-router";
+
+export default function RootLayout() {
+  return <Stack screenOptions={{ headerShown: false }} />;
+}

apps/mobile/index.ts

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+import "expo-router/entry";

apps/mobile/package.json

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+{
+  "name": "@trails-cool/mobile",
+  "version": "0.0.1",
+  "private": true,
+  "main": "index.ts",
+  "scripts": {
+    "start": "expo start",
+    "android": "expo start --android",
+    "ios": "expo start --ios",
+    "web": "expo start --web"
+  },
+  "dependencies": {
+    "@trails-cool/api": "workspace:*",
+    "@trails-cool/gpx": "workspace:*",
+    "@trails-cool/i18n": "workspace:*",
+    "@trails-cool/map-core": "workspace:*",
+    "@trails-cool/types": "workspace:*",
+    "expo": "~54.0.33",
+    "expo-router": "~4.0.22",
+    "expo-status-bar": "~3.0.9",
+    "react": "19.1.0",
+    "react-native": "0.81.5",
+    "react-native-safe-area-context": "~5.4.0",
+    "react-native-screens": "~4.11.0"
+  },
+  "devDependencies": {
+    "@types/react": "~19.1.0",
+    "typescript": "~5.9.2"
+  }
+}

apps/mobile/tsconfig.json

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+{
+  "extends": "expo/tsconfig.base",
+  "compilerOptions": {
+    "strict": true
+  }
+}

openspec/changes/mobile-app/tasks.md

@@ -2,10 +2,10 @@
 
 ### 1.1 App Scaffold
 
-- [ ] 1.1.1 Initialize Expo managed project at `apps/mobile/` with TypeScript template
+- [x] 1.1.1 Initialize Expo managed project at `apps/mobile/` with TypeScript template
-- [ ] 1.1.2 Configure pnpm workspace to include `apps/mobile` and resolve shared packages (`@trails-cool/types`, `@trails-cool/gpx`, `@trails-cool/i18n`)
+- [x] 1.1.2 Configure pnpm workspace to include `apps/mobile` and resolve shared packages (`@trails-cool/types`, `@trails-cool/gpx`, `@trails-cool/i18n`)
-- [ ] 1.1.3 Set up Expo Router with bottom tab navigation (Map, Routes, Activities, Profile) and placeholder screens
+- [x] 1.1.3 Set up Expo Router with bottom tab navigation (Map, Routes, Activities, Profile) and placeholder screens
-- [ ] 1.1.4 Add app icon, splash screen, and `app.config.ts` with bundle identifiers for iOS and Android
+- [x] 1.1.4 Add app icon, splash screen, and `app.config.ts` with bundle identifiers for iOS and Android
 - [ ] 1.1.5 Configure EAS Build for development and preview profiles
 
 ### 1.2 API Contract Package