feat: Sprint 0 — project scaffold, DB schema, Zustand stores, base UI components

app/_layout.tsx

@@ -0,0 +1,11 @@
+import { Stack } from 'expo-router';
+import { GestureHandlerRootView } from 'react-native-gesture-handler';
+import '../global.css';
+
+export default function RootLayout() {
+  return (
+    <GestureHandlerRootView style={{ flex: 1 }}>
+      <Stack screenOptions={{ headerShown: false }} />
+    </GestureHandlerRootView>
+  );
+}