fix: keep the interface visible while fonts load

Render fallback fonts immediately and preload regular Maple in the background. Cache public fonts after use without eagerly downloading every font during PWA installation.

web/src/main.ts

@@ -13,7 +13,6 @@ import '@@/assets/styles/app.css'
 import '@@/assets/styles/element-plus.scss'
 import 'virtual:uno.css'
 
-watchFontLoading()
 const app = createApp(App)
 app.use(i18n).use(pinia).use(router)
 const user = useUserStore(pinia)
@@ -28,5 +27,5 @@ watch(() => user.sessionVersion, () => {
 })
 // Mount a retryable error interface even if identity restoration temporarily fails.
 void router.isReady().catch(() => {}).finally(() => {
-  app.mount('#app'); void registerPwa()
+  app.mount('#app'); watchFontLoading(); void registerPwa()
 })