fix(docs): import ref in Vue README TypeScript example

[erhnysr]

What

The Vue integration guide's TypeScript example (packages/account-ui/src/frameworks/vue/README.md) imports only the Ref type from vue, but then calls the ref() function:

import { SignInWithBaseButton } from '@base-org/account-ui/vue';
import type { Ref } from 'vue';
...
const currentUser: Ref<User | null> = ref(null);   // ref is never imported

In a standard Vue 3 <script setup>, ref is not auto-imported (that only happens with plugins like unplugin-auto-import or Nuxt). As written, copy-pasting the snippet fails with ReferenceError: ref is not defined.

Fix

Import the ref function alongside the type:

import { ref, type Ref } from 'vue';

Docs-only change; no code or public API is affected.

[cb-heimdall]

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