v1.2.11 - App audio sample rate fix

Bug Fixes

• App Audio loopback stream now opens correctly — was forcing 48 kHz on devices that run at 44.1 kHz, causing the stream to fail silently; now uses the device's native sample rate and resamples in the audio callback
• Capture errors are now visible — if the loopback stream fails to open, the error message is shown in the app label instead of disappearing silently