[BUG] MediaElement SeekTo() not working on macOS / Mac Catalyst

[hirendmindfire]

Is there an existing issue for this?

• I have searched the existing issues

Did you read the "Reporting a bug" section on Contributing file?

• I have read the "Reporting a bug" section on Contributing file: https://github.com/CommunityToolkit/Maui/blob/main/CONTRIBUTING.md#reporting-a-bug

Current Behavior

MediaElement.SeekTo() does not work correctly on macOS / Mac Catalyst.
Calling SeekTo() either has no effect, does not seek to the correct position,
or the SeekCompleted event never fires after the seek operation.

Expected Behavior

• SeekTo() should seek the media to the specified TimeSpan position
• The SeekCompleted event should fire after the seek operation completes
• Behavior should be consistent across all platforms (Android, Windows, macOS)

Steps To Reproduce

1. Create a .NET MAUI app targeting macOS / Mac Catalyst
2. Add a MediaElement and load any video/audio source
3. Call await mediaElement.SeekTo(TimeSpan.FromSeconds(10), CancellationToken.None);
4. Observe that the position does not update OR SeekCompleted event does not fire

Link to public reproduction project repository

https://github.com/CommunityToolkit/Maui/issues

Environment

- .NET MAUI CommunityToolkit MediaElement: 9.1.1]
- .NET MAUI: [8.0]
- macOS Version: [e.g. macOS 13.x Sonoma]
- Xcode Version: [e.g. 15.x]
- IDE: [e.g. Visual Studio 2022 / VS Code / Rider]

Anything else?

• The issue seems related to the AVPlayer implementation in MediaElementHandler.macios.cs
• Seeking works correctly on Android (ExoPlayer) and Windows (MediaPlayerElement)
• Similar issues have been reported for iOS seek behavior in [BUG] Media Element Seek not firing #1012
• Workaround (if any): calling SeekTo() inside StateChanged event after checking
  the state, but this is inconsistent and unreliable on macOS