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

app/(tabs)/contacts.tsx

@@ -0,0 +1,10 @@
+import { View, Text } from 'react-native';
+
+export default function ContactsScreen() {
+  return (
+    <View className="flex-1 items-center justify-center bg-secondary">
+      <Text className="text-xl text-charcoal">Contacts</Text>
+      <Text className="text-gray-500 mt-2">Coming in Sprint 1</Text>
+    </View>
+  );
+}