Plan step 19, containment.md C-19 and C-09. A modal sheet opened at 90%
of the viewport where M3 caps the initial position at 50% and lets the
person pull it up; `height` now defaults to `50dvh` and whatever is
passed is held under a ceiling of the screen less M3's 72dp top margin.
The drag handle is `on-surface-variant` undiluted, as
SheetBottomTokens' DockedDragHandleColor and the component's own header
comment already said.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9
