macOS Audio Reliability Improvements (v2.12)

Significant improvements to microphone and system audio handling on macOS:

USB Microphone Recovery
: System audio capture now automatically recovers when a USB microphone is disconnected
Hot-Plug Support
: Improved handling when microphones are plugged or unplugged during a session
Audio Format Stability
: Resolved system audio format drift issues that could affect recording quality
Mic Dropdown Updates
: Microphone selection dropdown now properly updates after hardware changes