[DavidTbilisi]

Problem

The GUI's Stop button only cancelled synthesis.

• Background player: once every chunk was ready, Stop left playback running to the end.
• Player window: Stop greyed out as soon as the run finished, while the mpv window kept playing.

Changes

• StreamingAudioPlayer.wait_until_released(cancel_event=) returns as soon as the event is set. smart_generate_long_text then raises GenerationCancelled, which stops the player, so cancelling cuts playback short, not only synthesis.
• A GUI player window stays registered after its worker ends, until it is closed or stopped (running(), any_streaming_player_running()). The GUI keeps Stop enabled while the window is open ("Playing in the player window. Stop closes it."), and Stop closes it. Stopping runs off the Tk thread.
• start() registers the player before starting its worker. A worker that ended at once used to unregister first and leave a stale entry; a new test caught it.
• The status shows "Playing…" once every chunk is ready, and "Stopped." after a stop (it used to say "Generation cancelled.").
• CLAUDE.md streaming notes updated.

Testing

• 8 new tests: cancel while the worker or the player process is still playing, a player window staying registered, Stop closing it, a headless player unregistering, Stop during playback raising GenerationCancelled and removing the run dir, and the GUI Stop / window-watch flow.
• Full suite: 801 passed. No new mypy errors.
• Driven in the real GUI with flatpak mpv:
  • Background mode, Stop 2 s into playback: audio stopped in 0.3 s and no mpv was left.
  • Window mode, Stop 2 s after the run ended: the window closed and no mpv was left.

🤖 Generated with Claude Code