Plan step 19, containment.md C-27 and C-28. `.inner-body` was 24px, a
value not on M3's 0/4/8/12/16/20/28/32/48 scale; it is 28px, the
extra-large corner of the dialog and bottom-sheet surface it stands in
for. `.header a` is title-large at weight 400, which its own section
comment and the `h2` under it already said.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
