`vm` should automatically unwrap refs to match vue/test-utils behavior

[ytoshiki]

Describe the feature

Problem

Currently, vm in mountSuspended() does not automatically unwrap refs, which is inconsistent with vue/test-utils:

// Current behavior (inconsistent)
const component = await mountSuspended(SomeComponent)
console.log(component.vm.someRef) // Returns ref object, not the value
console.log(component.vm.someRef.value) // Need to manually access .value

// Expected behavior (vue/test-utils)
const wrapper = mount(SomeComponent)
console.log(wrapper.vm.someRef) // Returns unwrapped value

Expected Behavior

wrapper.vm should automatically unwrap refs to match vue/test-utils:

const component = await mountSuspended(SomeComponent)
expect(component.vm.someRef).toBe('thing') // Should work directly
component.vm.someRef = 'new thing' // Should update ref.value
expect(component.vm.someRef).toBe('new thing') // Should reflect changes

Additional information

• Would you be willing to help implement this feature?
• Could this feature be implemented as a module?

Final checks

• Read the contribution guide.
• Check existing discussions and issues.