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>