When ROI labels are shown, each ROI's label now also reports its sum,
max and pixel count for the current image. Rather than reimplementing the
accumulation, this reuses the existing ROIIntegrationCPU engine (the
software counterpart of the FPGA roi_calc), built from the experiment and
cached per dataset. A small adapter folds the viewer's gap sentinel
(INT32_MIN+1) onto the engine's masked sentinel (INT32_MIN) so masked and
saturated pixels are handled correctly.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
leonarski_fandClaude Opus 4.8
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