test: check the inspector keeps a row when its node survives an update

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017W8YfdzDmZcR8A76jRjvZY
69ea15970eBE3 Agent committed on 9/11/2026, 8:14:14 AMparente9d6cae
2 files changedLine totals unavailable