[codex] Fix USB color preview and remove preset button#2
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What changed
Why
The USB preview path already emits RGB frames. The tile was previously marking them as BGR, which swapped red and blue. After fixing channel order, the camera's own UVC white balance remained heavily red/orange under cage illumination, so USB frames now get camera-side auto white balance where available plus a conservative software correction.
Validation
python -m py_compile pykaboo/camera_stream_tiles.pypython -m py_compile main_window_enhanced.pyC:\ProgramData\anaconda3\envs\sam3_py10\python.exe -m py_compile camera_worker.pydev_screenshots/: raw mean RGB(199.8, 128.7, 58.5), corrected mean RGB(135.0, 130.1, 99.3).