Fix Flutter App & Build iOS

My Flutter app used to compile and run flawlessly, but I left it untouched for a few months. When I opened it today it throws several errors and will not launch. I have not updated Flutter itself or any pub dependencies since the last successful build, so the project is sitting on older versions.

I need someone to:
• diagnose whatever is blocking a clean flutter run, whether that’s outdated packages, SDK or Xcode issues, or code that now conflicts with the current tool-chain
• apply the minimal fixes required so the project launches in debug on a recent simulator or physical device
• produce a successful flutter build ios release archive (IPA) I can submit to TestFlight

Acceptance criteria
1. flutter pub get completes with no warnings that stop the build
2. flutter run boots the app on iOS 16+ without crashes
3. flutter build ios finishes and the resulting IPA opens when installed via TestFlight

I can share the full project on GitHub or zip, along with the last working commit hash for reference. Let me know which Xcode and Flutter channel you prefer so I can mirror your environment before testing the handed-over build.