Mobile: redesign, onboarding, QR codes, logo, Spotify setup

- Redesign matching the web: album-art backdrops, Reanimated equalizer,
  spinning live ring, drifting ambient background, gradient buttons with
  spring press feedback and haptics, Space Grotesk headings, animated feed
  (enter + layout transitions); fix invisible tab labels
- Four-step onboarding for new accounts: which app you listen with (sets
  where songs open), the matching share setup, find friends (search,
  scan, invite), and a featured song. Skippable; stored server-side
- QR codes: My code (share link) and an in-app scanner (camera only, no
  microphone permission)
- Spotify setup via Last.fm or ListenBrainz with guided linking; Android
  shares Spotify automatically through the phone reader
- New logo as app icon, adaptive/monochrome icon and splash
- app.config.ts allows cleartext only for local http:// test builds

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MzFywujuH9TiuXbr9vjoX8

apps/mobile/src/app/spotify-setup.tsx

@@ -0,0 +1,20 @@
+import { router } from 'expo-router';
+import { StyleSheet } from 'react-native';
+import { Screen } from '@/components/Screen';
+import { SpotifySetup } from '@/components/setup/SpotifySetup';
+import { space } from '@/lib/theme';
+
+const close = () => (router.canGoBack() ? router.back() : router.replace('/'));
+
+/** Spotify via Last.fm or ListenBrainz, opened from Settings. */
+export default function SpotifySetupScreen() {
+  return (
+    <Screen edges={['top', 'bottom']} contentContainerStyle={styles.content}>
+      <SpotifySetup onDone={close} />
+    </Screen>
+  );
+}
+
+const styles = StyleSheet.create({
+  content: { flexGrow: 1, justifyContent: 'center', gap: space.lg },
+});