add scan qr npub

Author: Kelbie

app/(user-flow)/_layout.tsx

@@ -0,0 +1,29 @@
+/**
+ * @fileoverview User Flow Modal Layout
+ *
+ * This layout creates a nested stack navigator inside a modal presentation.
+ * The parent root Stack presents this group as a modal (slides up from bottom).
+ * Screens within this group push horizontally:
+ * - profile: Entry point, shows user profile info
+ * - userMessages: Chat with user (horizontal push)
+ * - share: Share user's npub via QR (horizontal push)
+ *
+ * The first screen shows a close button, subsequent screens show a back button.
+ */
+
+import { Stack } from 'expo-router';
+import { useTheme } from 'providers/ThemeProvider';
+import { createFlowLayoutScreenOptions } from '../../config/flowLayoutOptions';
+
+export default function UserFlowLayout() {
+  const { getPrimaryColor } = useTheme();
+
+  return (
+    <Stack screenOptions={createFlowLayoutScreenOptions(getPrimaryColor)}>
+      <Stack.Screen name="profile" options={{ title: 'Profile' }} />
+      <Stack.Screen name="userMessages" options={{ headerShown: false }} />
+      <Stack.Screen name="share" options={{ title: 'Share Profile' }} />
+    </Stack>
+  );
+}
+