Initial Upload

apps/mobile/app/user/_layout.tsx

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+/**
+ * User detail stack navigator layout
+ * Provides navigation for user detail screens
+ */
+import { Stack, useRouter } from 'expo-router';
+import { Pressable } from 'react-native';
+import { ChevronLeft } from 'lucide-react-native';
+import { colors } from '@/lib/theme';
+
+export default function UserLayout() {
+  const router = useRouter();
+
+  return (
+    <Stack
+      screenOptions={{
+        headerShown: true,
+        headerStyle: {
+          backgroundColor: colors.background.dark,
+        },
+        headerTintColor: colors.text.primary.dark,
+        headerTitleStyle: {
+          fontWeight: '600',
+        },
+        headerBackTitle: 'Back',
+        headerLeft: () => (
+          <Pressable onPress={() => router.back()} hitSlop={8}>
+            <ChevronLeft size={28} color={colors.text.primary.dark} />
+          </Pressable>
+        ),
+        contentStyle: {
+          backgroundColor: colors.background.dark,
+        },
+      }}
+    >
+      <Stack.Screen
+        name="[id]"
+        options={{
+          title: 'User',
+        }}
+      />
+    </Stack>
+  );
+}