chore(svg-icons): remove stray element-icons @font-face from SVG_ICONS

The sprite string carried two <defs><style> blocks pointing at a hardcoded chrome-extension:// font URL. Safari blocks the load and spams console warnings on every page; the font was never used by anything.

SVG 精灵图（sprite）字符串里夹带了两段 <defs><style>，指向一个硬编码的 chrome-extension:// 字体地址。Safari 会拦截该加载并在每个页面刷控制台警告；而这个字体从未被实际使用过。

Assisted-by: Claude Fable 5 <noreply@anthropic.com>

Author: moonchime