fix: video playback state synchronization

[schembriaiden]

Pull Request Description

This pull request improves the handling of playback state synchronization between the UI and the playback model in the video player feature. The main updates ensure that the playback state is accurately reflected and that the UI stays in sync with the underlying state.

Playback state synchronization improvements:

• Added a _setupListeners method in _VideoPlayerState to listen for changes to the playing state from mediaPlaybackProvider and update the local playing variable accordingly, ensuring the UI remains in sync with the playback state.
• Updated the call to updatePlaybackPosition in VideoPlayerNotifier to use the new playing value from the event, rather than the previous state, for more accurate state updates.

Issue Being Fixed

Resolves #787

Screenshots / Recordings

Tested On

• Android
• Android TV
• iOS
• Linux
• Windows
• macOS
• Web

Checklist

• If a new package was added, did you ensure it works for all supported platforms? Is the package well maintained
• Check that any changes are related to the issue at hand.

[PartyDonut]

I'm not sure this is the fix for that users problem.
This would only add a small delay to the call itself I believe.

The issue might actually be in the way playback is paused or at least how the signal is passed on to flutter.

[schembriaiden]

The issue might actually be in the way playback is paused or at least how the signal is passed on to flutter.

I think this should be the actual fix now, thanks for your feedback.

[PartyDonut]

Sorry, I might have not been clear enough. When I said the issue is in how paused/playing is managed, I meant the playbackmodel helper.

The user seems to be reporting a mismatch between what the client visually shows and what is being send to jellyfin.
So the problem is likely inside of the playbackmodel.

Currently all players report back their current state inside of video_player_provider.dart this in turn tells the playbackmodel to report back to the server.

My best guess there is a race condition between the playbackmodel reporting the state (play/paused) and reporting the position.

In short: Fladder incorrectly sends "playing" to jellyfin, despite the player being paused.