0a5e57ce76
- Add useCameraDevices hook to enumerate video input devices - Update useScreenRecorder to support webcamDeviceId selection - Add device selector UI above HUD bar (mic + webcam, hover-to-expand) - All selectors and HUD bar are absolute-positioned to prevent layout shifts - Increase HUD window to 600x200px to accommodate device panels - Add unit tests for useCameraDevices hook