ui: geometry.defeature.propose lists the small features with an on/off switch each (#433)

Holes by diameter, fillets by radius, chamfers by distance and bosses by height below
thresholds, or under a geometry.check finding; the reply panel switches each feature
off and on (geometry.defeature) and defeatures the whole proposal.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo

crates/engine/src/cmd/mod.rs

@@ -82,6 +82,7 @@ pub static ALL: &[CommandSpec] = &[
     virtual_faces::FACE_SPLIT_DELETE,
     defeature::DEFEATURE,
     defeature::DEFEATURE_DELETE,
+    defeature::DEFEATURE_PROPOSE,
     stitch::STITCH,
     stitch::STITCH_DELETE,
     mesh::NODE_ADD,