chore: vendor client into main repo

client/app/(onboarding)/_layout.tsx

@@ -0,0 +1,18 @@
+import { Stack } from 'expo-router';
+import { useTranslation } from 'react-i18next';
+
+export default function OnboardingLayout() {
+  const { t } = useTranslation();
+
+  return (
+    <Stack
+      screenOptions={{
+        headerTitleAlign: 'center',
+      }}
+    >
+      <Stack.Screen name="onboarding" options={{ title: t('onboarding.title') }} />
+      <Stack.Screen name="push-prompt" options={{ title: t('push.title') }} />
+    </Stack>
+  );
+}
+