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WhatsApp bridge (bridge.js) only sets ptt:true when file extension is .ogg or .opus, causing mp3/wav files (from Edge TTS, NeuTTS, etc.) to arrive as file attachments instead of voice bubbles — silently, with no error. Fix: when audio type is sent with a non-ogg/opus format, run ffmpeg conversion to ogg/opus in a temp file before sending. This makes send_voice() self-sufficient regardless of what format the caller provides. Fallback: if ffmpeg is unavailable, original buffer is sent (previous behaviour) with a console.warn — no crash. Addresses veloguardian's review comment on PR #4992.