Remove every .cdk-overlay-container from the DOM. Call in afterEach: CDK reuses a single
container across a test file, and a panel left open by one test would otherwise be visible to the
next test's overlay queries (a cross-test leak the fixture teardown does NOT clean up).
Remove every
.cdk-overlay-containerfrom the DOM. Call inafterEach: CDK reuses a single container across a test file, and a panel left open by one test would otherwise be visible to the next test's overlay queries (a cross-test leak the fixture teardown does NOT clean up).