feat: initialize voice-mobile React Native app with NativeWind v5

- Created new Expo app with SDK 54+ and Expo Router
- Installed and configured NativeWind v5 for Tailwind styling
- Upgraded voice-assistant to React 19 for consistency
- Kept voice-mobile outside workspace to avoid Metro bundler conflicts
- Disabled React Compiler experimental feature for stability

Setup includes:
- postcss.config.mjs with Tailwind PostCSS plugin
- global.css with Tailwind and NativeWind imports
- metro.config.js with NativeWind wrapper
- lightningcss pinned to 1.30.1 for stability

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

packages/voice-mobile/components/hello-wave.tsx

@@ -0,0 +1,19 @@
+import Animated from 'react-native-reanimated';
+
+export function HelloWave() {
+  return (
+    <Animated.Text
+      style={{
+        fontSize: 28,
+        lineHeight: 32,
+        marginTop: -6,
+        animationName: {
+          '50%': { transform: [{ rotate: '25deg' }] },
+        },
+        animationIterationCount: 4,
+        animationDuration: '300ms',
+      }}>
+      👋
+    </Animated.Text>
+  );
+}