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