fix(web): render UI icons as SVG instead of font glyphs

UI chrome (dropdown carets, undo/redo, checkmarks, close/menu/osnap,
layer/file-menu icons) and ribbon tool icons were drawn as Unicode
glyphs. Desktop fills missing glyphs via system-font fallback, but the
web build bundles only Fira Sans with no fallback, so they rendered as
empty tofu boxes (issue #116).

Add a shared src/ui/icons.rs (SVG-backed, tintable) plus bundled assets,
and switch every glyph site and IconKind::Glyph tool def to SVG.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

assets/icons/ui/gear.svg

@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#000000" stroke-width="1.6" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3.2"/><path d="M12 2 V5 M12 19 V22 M2 12 H5 M19 12 H22 M4.9 4.9 L7 7 M17 17 L19.1 19.1 M19.1 4.9 L17 7 M7 17 L4.9 19.1"/></svg>