fix: $slidev unwrapping on build

Author: antfu

packages/client/modules/context.ts

@@ -1,5 +1,6 @@
 import { App, reactive } from 'vue'
 import type { UnwrapNestedRefs } from '@vue/reactivity'
+import { objectKeys } from '@antfu/utils'
 import * as nav from '../logic/nav'
 
 declare module '@vue/runtime-core' {
@@ -11,9 +12,16 @@ declare module '@vue/runtime-core' {
 export default function createSlidevContext() {
   return {
     install(app: App) {
-      app.config.globalProperties.$slidev = {
-        nav: reactive({ ...nav }),
+      const navObj: typeof nav = {} as any
+      // need to copy over to get rid of the "Module" object type (will not unwrap)
+      for (const key of objectKeys(nav)) {
+        if (typeof key === 'string')
+          // @ts-expect-error
+          navObj[key] = nav[key]
       }
+      app.config.globalProperties.$slidev = reactive({
+        nav: navObj,
+      })
     },
   }
 }