TUI sounds print ALSA lib errors into terminal on audio-less devices (Termux/Android) #51841

Description

On Android 16 + Termux (no audio device), enabling sounds makes every completed turn print ALSA lib ... lines into the terminal, corrupting the TUI as ghost text. Disabling all sounds stops it. Audio backend errors should go to the debug log, not stderr/TTY.

Evidence (same session, server-side outputs always clean):

• Sounds ON: tool call 1 -> ghost seen; tool call 2 -> ghost seen
• Sounds OFF: tool call 3 -> clean; tool call 4 -> clean

Suspected path: packages/tui/src/audio.ts (Audio.create/start) -> ALSA init failure escapes to stderr. Config packages/tui/src/config/index.tsx (attention.sound defaults true).

Plugins

Local nabiz harness plugin (unrelated to audio; trigger is turn-end sound)

OpenCode version

2.0.18 (opencode --version -> opencode v2.0.18)

Steps to reproduce

1. On Termux/Android with no ALSA device, open opencode TUI.
2. Settings -> General -> Sounds: enable agent/permissions/errors sounds.
3. Run any tool (e.g. bash echo) and let the turn end.
4. ALSA lib ... lines appear in the terminal.
5. Disable all sounds -> repeat -> no lines.

Screenshot and/or share link

None (text corruption in TUI; can provide on request)

Operating System

Android 16, Termux, aarch64 (Linux 6.17.0-PRoot-Distro)

Terminal

Termux