## Summary - scope each comment layer to its own editor host instead of the first document in the DOM - keep the comment composer in the active parent document after top-level navigation - add browser regression coverage for creating a comment after navigating between parent documents

## Verification - bun test (1362 passed, 2 skipped) - bun run types - bun run ci - bun run e2e e2e/document-navigation.e2e.ts --project=chromium --grep "a newly navigated parent document opens and submits its own comment composer"