initial

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

@@ -0,0 +1,9 @@
+// Authenticated app group layout.
+// Gate on session: if no session, redirect to `/`.
+// Add tab bar / drawer nav here once we have more than one screen.
+
+import { Stack } from 'expo-router';
+
+export default function AppLayout() {
+  return <Stack screenOptions={{ headerShown: true }} />;
+}