A FAB nested in another component has to be restyled from that component's stylesheet, and its root carried no hook. Added here rather than with the rule that needs it, so the actions stream's own use of the hook merges cleanly. Plan: docs/plans/material-3-alignment.md, step 14 (navigation N-03). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9