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

app/(tabs)/_layout.tsx

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+import { Tabs } from 'expo-router';
+import { Home, Users, Map, Settings } from 'lucide-react-native';
+
+export default function TabLayout() {
+  return (
+    <Tabs
+      screenOptions={{
+        tabBarActiveTintColor: '#1A6B72',
+        tabBarInactiveTintColor: '#9CA3AF',
+        headerShown: false,
+      }}
+    >
+      <Tabs.Screen
+        name="index"
+        options={{
+          title: 'Home',
+          tabBarIcon: ({ color, size }) => <Home size={size} color={color} />,
+        }}
+      />
+      <Tabs.Screen
+        name="contacts"
+        options={{
+          title: 'Contacts',
+          tabBarIcon: ({ color, size }) => <Users size={size} color={color} />,
+        }}
+      />
+      <Tabs.Screen
+        name="map"
+        options={{
+          title: 'Map',
+          tabBarIcon: ({ color, size }) => <Map size={size} color={color} />,
+        }}
+      />
+      <Tabs.Screen
+        name="settings"
+        options={{
+          title: 'Settings',
+          tabBarIcon: ({ color, size }) => <Settings size={size} color={color} />,
+        }}
+      />
+    </Tabs>
+  );
+}

app/(tabs)/contacts.tsx

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+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>
+  );
+}

app/(tabs)/index.tsx

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+import { View, Text } from 'react-native';
+
+export default function HomeScreen() {
+  return (
+    <View className="flex-1 items-center justify-center bg-secondary">
+      <Text className="text-2xl font-bold text-primary">TerritoryLog</Text>
+      <Text className="text-charcoal mt-2">Dashboard coming in Sprint 2</Text>
+    </View>
+  );
+}

app/(tabs)/map.tsx

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+import { View, Text } from 'react-native';
+
+export default function MapScreen() {
+  return (
+    <View className="flex-1 items-center justify-center bg-secondary">
+      <Text className="text-xl text-charcoal">Map</Text>
+      <Text className="text-gray-500 mt-2">Coming in Sprint 4</Text>
+    </View>
+  );
+}

app/(tabs)/settings.tsx

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+import { View, Text } from 'react-native';
+
+export default function SettingsScreen() {
+  return (
+    <View className="flex-1 items-center justify-center bg-secondary">
+      <Text className="text-xl text-charcoal">Settings</Text>
+      <Text className="text-gray-500 mt-2">Coming in Sprint 6</Text>
+    </View>
+  );
+}