Move the QMessageBox-displaying helper out of the logging utility into a
dedicated UI class. RiaLogging.h no longer pulls QMessageBox/QWidget into
the ~270 files that include it. Behavior is preserved: showError displays
the dialog when running interactively (and not under regression tests),
then forwards the text to RiaLogging::error.
The range-based loop used the outer column index 'i' as the element index, causing only one slot to be written while all others remained zero. Extracted scaleColumnIfModulus() helper to remove duplication between both branches.