fix(components): [message] the value of exposeProxy may be null (#9378)

* fix(components): [message] the value of exposeProxy may be null

* feat: use exposed

packages/components/message/src/instance.ts

@@ -26,5 +26,5 @@ export const getInstance = (id: string) => {
 export const getLastOffset = (id: string): number => {
   const { prev } = getInstance(id)
   if (!prev) return 0
-  return prev.vm.exposeProxy!.bottom
+  return prev.vm.exposed!.bottom.value
 }

packages/components/message/src/method.ts

@@ -117,7 +117,7 @@ const createMessage = (
     // instead of calling the onClose function directly, setting this value so that we can have the full lifecycle
     // for out component, so that all closing steps will not be skipped.
     close: () => {
-      vm.exposeProxy!.visible = false
+      vm.exposed!.visible.value = false
     },
   }