feat: declare Content and ClientOnly components as GlobalComponents (#5156)

closes #5154

src/client/index.ts

@@ -11,6 +11,10 @@ export type { EnhanceAppContext, Theme } from './app/theme'
 // shared types
 export type { HeadConfig, Header, PageData, SiteData } from '../../types/shared'
 
+// components
+import { ClientOnly } from './app/components/ClientOnly'
+import { Content } from './app/components/Content'
+
 // composables
 export { dataSymbol, useData } from './app/data'
 export { useRoute, useRouter } from './app/router'
@@ -25,4 +29,11 @@ export {
 } from './app/utils'
 
 // components
-export { Content } from './app/components/Content'
+export { ClientOnly, Content }
+
+declare module 'vue' {
+  interface GlobalComponents {
+    ClientOnly: typeof ClientOnly
+    Content: typeof Content
+  }
+}