v1.19.4

• Listen & translate: sequential auth-stop / halt fixes (BM-025) so failed auth no longer leaves the pipeline stuck
• Mic diagnosis helpers for Mac listen troubleshooting
• Stability fixes for bilingual live listen transfer coverage and overlap handling
• Same 1.19.4 App builds as TestFlight / App Store (intl iOS 177 · Mac 125; CN iOS 119 · Mac 117)

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• 听译：鉴权失败顺序停机与停机闸修复（BM-025），避免通道失败后卡住
• Mac 听译麦克风诊断辅助
• 双语听译转交覆盖与重叠处理稳定性修复
• 与 TestFlight / App Store 同版 1.19.4（国际 iOS 177 · Mac 125；国内 iOS 119 · Mac 117）

Full Changelog: v1.19.0...v1.19.4