Plan step 25 (navigation Missing): M3's toolbar configuration table lists "With FAB" for both toolbars, but the `fab` slot was gated to the floating one. A docked toolbar now takes it at its end, inside the toolbar where the arrow keys reach it; its controls gather at the start, and the FAB rests flat on the bar — elevation 0 for a FAB nested in another component, as Compose's bottomAppBarFabElevation is. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Qwx5USif3wFFmxtHg5U1g9