[PB-5933] feature/Integrate expo-share-extension for sharing functionality

[CandelR]

Set up share extension functionality for Android and iOS. This enables users to share files from other apps directly.

Android

• Added ShareIntentModule native Kotlin module that exposes getSharedFiles() to JS and emits ShareIntentReceived events when the app is already running
• Added ShareIntentPackage to register the module with React Native
• Extended MainActivity to parse ACTION_SEND / ACTION_SEND_MULTIPLE intents on both cold start (onCreate) and hot path (onNewIntent)
• Created AndroidShareScreen to display shared files within the main app navigator
• Added AndroidShare route to the navigation stack
• Extracted share intent logic into useAndroidShareIntent hook (cold start fetch, auth-gated navigation, and live event listener)

iOS

• Added InternxtShareExtension as a native iOS app extension (Swift + entitlements)
• Integrated expo-share-extension and configured index.share.js as its entry point
• Created ShareExtensionApp component to render shared content inside the extension
• Updated metro.config.js to bundle the share extension separately

[sonarqubecloud]

Quality Gate failed

Failed conditions
6.4% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud