Assist stays in listening state after response on Samsung Galaxy A55

Description:
Home Assistant Android Companion App remains in listening state after Assist has answered.

Environment:
- Device: Samsung Galaxy A55
- Companion App: 2026.6.5-full
- Home Assistant Core: 2026.8.3

Steps to reproduce:
1. Open Home Assistant app.
2. Start Assist.
3. Ask "What time is it?"
4. Wait for response.

Expected:
Assist finishes and microphone closes.

Actual:
After the response, the microphone remains green and Assist shows it is still listening.
The app does not respond to further voice commands.
Pressing "Stop listening" immediately ends the session.

Additional information:
- Happens with both Home Assistant and Home Assistant Cloud assistants.
- Voice Preview Edition works correctly and exits listening mode normally.
- Assist debug shows STT, Conversation and TTS complete successfully with action_done.
- Clearing cache and verifying microphone permissions did not help.

Start by reproducing the issue on a Samsung Galaxy A55 with Companion App 2026.6.5-full and inspect the Assist lifecycle around the action_done event in the debug output. Compare the normal Voice Preview Edition behavior; the work is done when Assist closes the microphone after a response and accepts a subsequent voice command.

Written by the indexing model from the issue text.