feat(types): 添加NuxtApp中$lenis的类型声明

在HomeHero组件中简化$lenis的类型获取方式

app/components/home/HomeHero.vue

@@ -41,7 +41,7 @@ onMounted(() => {
     return
   }
 
-  const { $lenis } = useNuxtApp() as ReturnType<typeof useNuxtApp> & { $lenis?: Lenis }
+  const { $lenis } = useNuxtApp()
   const pinEndScale = 0.65
   const finalScale = 0.18
   const getExitDistance = () => window.innerHeight

app/types/nuxt-app.d.ts

@@ -0,0 +1,9 @@
+import type Lenis from 'lenis'
+
+declare module '#app' {
+  interface NuxtApp {
+    $lenis?: Lenis
+  }
+}
+
+export {}