Fix PWA icons and mobile reading overflow

Generate PNG icons from favicon.svg at build time so manifest icons resolve, replace legacy font tags with div wrappers, and tighten mobile layout so long text wraps instead of clipping.

Co-authored-by: Cursor <cursoragent@cursor.com>

.vitepress/config.mts

@@ -9,7 +9,7 @@ import { generateSidebar } from './sidebar.mts'
 const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..')
 
 export default defineConfig({
-  title: 'DAO DE JING',
+  title: '道德经',
   description: '传统文化典籍资料库',
   lang: 'zh-CN',
   srcDir: '.',