feat(mobile): replace starter template with dashboard-driven app flow

MobileApp/app/index.tsx

@@ -0,0 +1,36 @@
+import { Redirect } from 'expo-router';
+import React from 'react';
+import { ActivityIndicator, StyleSheet, View } from 'react-native';
+
+import { useApp } from '@/src/app-context';
+
+export default function IndexRoute() {
+  const { ready, state } = useApp();
+
+  if (!ready) {
+    return (
+      <View style={styles.loading}>
+        <ActivityIndicator color="#60a5fa" size="large" />
+      </View>
+    );
+  }
+
+  if (!state.session?.session) {
+    return <Redirect href={'/auth' as any} />;
+  }
+
+  if (!state.deviceToken) {
+    return <Redirect href={'/onboarding' as any} />;
+  }
+
+  return <Redirect href="/(tabs)" />;
+}
+
+const styles = StyleSheet.create({
+  loading: {
+    flex: 1,
+    backgroundColor: '#0a0a0c',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+});