v1.0.1 - Integrate Bootstrap Icons web font

Add bootstrap-icons npm package with SCSS import and font file copy
build step. All 2,000+ icons available via CSS classes (bi bi-*) in
both frontend and block editor.

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

src/scss/_variables.scss

@@ -44,3 +44,7 @@ $enable-dark-mode: true;
 
 // Enable reduced motion
 $enable-reduced-motion: true;
+
+// Bootstrap Icons font path (points to copied files in assets/fonts/)
+$bootstrap-icons-font-src: url("../fonts/bootstrap-icons.woff2") format("woff2"),
+                           url("../fonts/bootstrap-icons.woff") format("woff");