## Summary

- keep the highlighted passage directly above an open comment sheet - restore the readers prior document position when the sheet closes - use the same comment-sheet behavior on phones and tablets - retain desktop popovers at 1200px and wider

## Verification

- phone and tablet behavior test: 20/20 parallel stress runs - browser suite excluding confirmed baseline failure: 157/157 - unit tests: 765 passed, 2 database-only skips - types, formatting, lint, token checks, production build, and diff check passed - visually inspected at 390x844 and 768x1024

## Baseline issue

The full suite also runs a callout keyboard test that currently fails identically on a clean origin/main worktree: `a callout type menu has one keyboard path`. No callout code is changed here.