A pattern or mirror of a suppressed feature has nothing to copy: its copies go with it and the pattern warns (the acceptance enclosure loses all four standoffs when Standoff is suppressed); scenario acceptance_pattern_of_suppressed_feature enabled

Fixes #42

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RjGw4gA5ZvKrU8MQP6sBgT

crates/ui-egui/tests/scenarios/acceptance_pattern_of_suppressed_feature.json

@@ -1,7 +1,4 @@
 [
- {
-  "pending": "#42: suppressing a patterned feature keeps the pattern's copies"
- },
  {
   "note": "Acceptance (#27): suppressing the PCB standoff takes the patterned copies with it."
  },