[Bug]: Stopped playback threads remain in the internal thread registry

[sepandhaghighi]

Contact details

me@sepand.tech

What happened?

After calling stop_all(), stopped threads are still kept in _play_threads_map.

Steps to reproduce

1. Start one or more sounds asynchronously.
2. Call stop_all().
3. Inspect params._play_threads_map.

Expected behavior

All stopped threads should be removed from the internal registry.

Actual behavior

The registry still contains references to stopped threads, causing stale entries to accumulate.

Operating system

Linux

Python version

Python 3.11

Nava version

Nava 0.8

Relevant log output