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/haptic-tab.tsx

@@ -0,0 +1,18 @@
+import { BottomTabBarButtonProps } from '@react-navigation/bottom-tabs';
+import { PlatformPressable } from '@react-navigation/elements';
+import * as Haptics from 'expo-haptics';
+
+export function HapticTab(props: BottomTabBarButtonProps) {
+  return (
+    <PlatformPressable
+      {...props}
+      onPressIn={(ev) => {
+        if (process.env.EXPO_OS === 'ios') {
+          // Add a soft haptic feedback when pressing down on the tabs.
+          Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Light);
+        }
+        props.onPressIn?.(ev);
+      }}
+    />
+  );
+}