chatgui: add sound playback via miniaudio (MP3 notification sounds)

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- SoundManager singleton wraps ma_engine + ma_sound (non-blocking, background thread)
- MP3 files embedded in QRC, decoded to PCM at startup with MA_SOUND_FLAG_DECODE
- miniaudio.h (MIT) in lib/, IMPLEMENTATION in separate miniaudio_impl.c
- Sound settings page in SettingsDialog: enable/disable, volume slider (0-100%)
- Config keys [gui] sound_enabled, sound_volume
- Incoming messages trigger msg_incoming.mp3 sound

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Evgeny committed 2026-07-19 14:46:21 +03:00

1 parent f6f7e12192

commit c2ad2e78c3

25 files changed

+101647 -2

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lib/dr_mp3.h

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lib/miniaudio.h

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