Disabling each control on its own left labels and descriptions at full
strength, so the group still read as editable. The defaults now sit in a
bordered, dimmed block with the reason at its top.

The explanation stays outside the dimmed area: the one part that must remain
readable is the part saying why the rest isn't.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>