The dialog follows the options solid.fillet takes together: If too large
(fit) and Corners show only for Constant radius, a curvature corner and a
fitted radius rule each other out and the other resets visibly, and an
option that does not apply is never sent (it used to send `corner: g2`
with Reduce or Taper and get refused). Variable Radius shows only for the
types that take it; the Advanced section held only the fit and is gone.
Each option has a one-line hover text. Kernel refusals read in plain
words, with the raw text in the hover, Copy Details and the issue report.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>