The ROI panel now shows editable numeric fields for the selected ROI,
labelled by type: box min/max X/Y, circle centre/radius, or azimuthal
Q-range and phi sector. Editing a field rebuilds that ROI and commits it
through the same SetROIDefinition path, so all three types can be created
(via +) and dialled in by typing, not only by dragging.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>