The voice inactivity timer (VOICE_TIMEOUT) only counted the bot's OWN audio
playback as activity. Under /voice off (text-only replies, but still in the
channel — leaving is /voice leave) nothing ever reset it, so every 300s the bot
disconnected and spammed "Left voice channel (inactivity timeout)."
The adapter now learns the live voice-reply mode via a getter wired from run.py
and skips the auto-disconnect while mode is off. It also resets the timer when a
user actually speaks to the bot, so an active listener (incl. voice-on
text-only sessions that never play audio) isn't dropped mid-conversation.
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