Draws the line icons of the header's controls (search, its ✕, chat and the
bell) and of ChatFab. They stroke in the text colour; the shapes marked
nav-icon-tint also fill with --nav-icon-tint, which the header sets to a
wash of the accent and the floating button leaves unset. Themes set the
line's weight and ends with --nav-icon-stroke and --nav-icon-linecap.
Usage
import * as mod from "src/components/layout/NavIcons.tsx";