Refactor mobile to fix dependency resolution and add polyfills

Update Expo and React dependencies to compatible versions. Create a
custom Metro config to resolve module conflicts in the workspace and
map Jest modules to local node_modules.

Add a SharedArrayBuffer polyfill for older runtimes and introduce an
adapter for expo-notifications to abstract direct imports.

apps/mobile/App.tsx

@@ -1,5 +1,5 @@
 import { useEffect } from 'react';
-import * as Notifications from 'expo-notifications';
+import * as Notifications from './src/services/expoNotifications';
 import AppNavigator from './src/navigation/AppNavigator';
 
 export default function App() {