M3 asks a vertical toolbar for a 24dp margin from the window edge where a horizontal one keeps 16, and its standard-toolbar colour list ends "Standard button (Primary)" — the vibrant row of the same list was already honoured, so the two were being read inconsistently. Both rules are unlayered, because an icon button's ink is a utility. Plan: docs/plans/material-3-alignment.md, step 21 (navigation N-12, N-13). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9