One stroked icon set, matching the Administration shield

The site drew its icons with colour emoji, which means a different
drawing on every operating system and never the same line weight twice —
except the Administration entry, whose shield is a text-default glyph and
so rendered as a thin outline. That one was the odd one out and also the
one that looked right.

Fifteen inline SVG paths now replace it: menu, bell, shield, globe, gear,
sun, moon, power, lock, envelope, door, clip, check, chevron, close. They
are stroked in currentColor and sized in em, so an icon takes the colour
and size of the text beside it and needs no rule of its own — the caret
in the dark nav bar and the gear in a light dropdown are the same file.

The explorer keeps its emoji. There the icon says what kind of file this
is and the colour is doing real work; a wall of identical grey outlines
would be a worse file list.

One bug fell out of the change: .nav-notif was painted with --text, the
page's text colour, on a nav bar that is nearly black. The emoji bell
carried its own colours and showed anyway; a stroked one was invisible
until it was given --nav-text.

Checked by rendering the real stylesheet in headless Chrome, light and
dark.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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