Merge three sequential expand/collapse tests into the existing
"multiple disclosures are independent" test, which already exercised
expansion for two triggers. Added a final click to cover the collapse
case so no behavior coverage is lost.
3,819 → 3,786 LOC (-33). 159 tests still passing.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>