chore: uniformize defineModel placement and emits

src/runtime/components/RadioGroup.vue

@@ -47,6 +47,13 @@ const props = withDefaults(defineProps<RadioGroupProps<T>>(), { orientation: 've
 const emits = defineEmits<RadioGroupEmits>()
 defineSlots<RadioGroupSlots<T>>()
 
+const modelValue = defineModel<T>({
+  set(value) {
+    emits('change', value)
+    return value
+  }
+})
+
 const rootProps = useForwardPropsEmits(reactivePick(props, 'as', 'defaultValue', 'orientation', 'loop', 'required'), emits)
 
 const { emitFormChange, color, name, size, inputId: _inputId, disabled } = useFormField<RadioGroupProps<T>>(props)
@@ -80,13 +87,6 @@ const normalizedOptions = computed(() => {
   return props.options.map(normalizeOption)
 })
 
-const modelValue = defineModel<T>({
-  set(value) {
-    emits('change', value)
-    return value
-  }
-})
-
 // FIXME: I think there's a race condition between this and the v-model event.
 // This must be triggered after the value updates, otherwise the form validates
 // the previous value.