Flutter Utility App Refinement

I already have the basic Flutter codebase set up and compiling, but it needs that final round of engineering and UI love before it can ship. The app is a straightforward utility: a personal task manager whose standout capability is rock-solid task prioritization.

Here’s what I need from you:
• Review the existing Dart code, spot bottlenecks, and refactor where necessary so the project stays clean, null-safe, and on the current stable Flutter channel.
• Finish the task-management workflow: create, edit, reorder, and archive tasks while letting users assign a priority level that drives list sorting.
• Wire up local persistence with Hive or another lightweight store (open to your suggestion) so priorities stay intact between sessions.
• Polish the UI with Material 3 widgets and responsive layouts; the app should feel native on both Android and iOS.
• Add subtle animation cues—nothing flashy, just enough to make drag-to-reorder and priority changes feel smooth.
• Ship fully tested code (unit + widget tests) plus a signed debug build so I can run acceptance on my devices.

Acceptance criteria
– Task creation, editing, and deletion work consistently.
– Priority flag immediately changes sort order and persists after restart.
– All tests pass in CI and the app builds without warnings on Android Studio.

Send a short note outlining your approach, mention one recent Flutter project you’re proud of, and let’s get this wrapped up.