v0.2.2 - Runtime version resolution & polish

What's New

• Runtime version resolution — App version is now read from platform package info at runtime instead of a hardcoded constant.
• Terminal banner — Connect banner shows the actual installed version from APK metadata.
• Update checker — Uses runtime version for comparison against GitHub Releases.
• Removed hardcoded appVersion constant from constants.dart.

Changelog

• Add AppVersion utility (package_info_plus) for runtime version resolution
• update_service.dart: Use AppVersion.get() instead of hardcoded constant
• terminal_screen.dart: Show runtime version in connect banner
• Remove appVersion from constants.dart
• Bump to 0.2.2+4