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/components/QrCode.tsx

@@ -0,0 +1,19 @@
+import { useMemo } from 'react';
+import { View } from 'react-native';
+import Svg, { Path, Rect } from 'react-native-svg';
+import { qrShape } from '@musicshare/shared';
+
+/** Black-on-white QR code (scanners need the contrast) with the standard 4-module quiet zone. */
+export function QrCode({ value, size = 240 }: { value: string; size?: number }) {
+  const shape = useMemo(() => qrShape(value), [value]);
+  const quiet = 4;
+  const total = shape.size + quiet * 2;
+  return (
+    <View accessible accessibilityLabel={`QR code for ${value}`} style={{ width: size, height: size, borderRadius: 16, overflow: 'hidden' }}>
+      <Svg width={size} height={size} viewBox={`${-quiet} ${-quiet} ${total} ${total}`}>
+        <Rect x={-quiet} y={-quiet} width={total} height={total} fill="#ffffff" />
+        <Path d={shape.path} fill="#000000" />
+      </Svg>
+    </View>
+  );
+}