AR Navigation Integration (Flutter + Unity AR Foundation)

I have an existing Flutter application and a Unity AR project.

The pathfinding logic (A* - A-Star) is partially implemented but not fully functional or correctly integrated.

Current Issues:
- The A* pathfinding is not fully implemented or needs refinement
- The path is not properly aligned with the environment
- The path sometimes goes through restricted areas (e.g., center/field)
- The path is not smooth and needs Bezier curve smoothing
- The AR visualization is not stable or accurate

Required Work:
I need a developer to fix and complete both the A* pathfinding logic and the integration between Flutter and Unity so that:

1. User selects a destination in Flutter UI
2. Data is sent to Unity
3. A* generates a correct path
4. Unity opens camera and renders AR navigation path correctly in real-time

Requirements:
- Strong experience with pathfinding algorithms (A*)
- Strong experience with Flutter
- Experience integrating Unity as a Library
- AR Foundation (ARKit / iOS)
- C# scripting in Unity

Important:
- Improve and complete the existing A* implementation (do not replace it entirely)
- Do NOT replace Flutter with Unity UI
- The task is integration and fixing the AR + pathfinding issues, not rebuilding the app

Testing Requirement:
- The final solution must run on my iPhone (iPhone 15 Pro)


Deliverables:
- Fully working end-to-end flow
- Correct A* path (no crossing restricted areas)
- Smooth path using Bezier curves
- Stable AR visualization
- Working iOS build (iPhone compatible)
- Demo video showing AR path rendering working on device