refactor(nc-gui): overlay transition

packages/nc-gui/components/general/Overlay.vue

@@ -43,16 +43,27 @@ export default {
 
 <template>
   <teleport :disabled="teleportDisabled || (inline && !target)" :to="target || 'body'">
+    <Transition :name="transition ? 'fade' : undefined" mode="out-in">
       <div
+        v-show="!!vModel"
         v-bind="$attrs"
-      :class="[
+        :class="[inline ? 'absolute' : 'fixed']"
-        vModel ? 'opacity-100' : 'opacity-0 pointer-events-none',
-        inline ? 'absolute' : 'fixed',
-        transition ? 'transition-opacity duration-200 ease-in-out' : '',
-      ]"
         class="z-100 top-0 left-0 bottom-0 right-0 bg-gray-700/75"
       >
         <slot :is-open="vModel" />
       </div>
+    </Transition>
   </teleport>
 </template>
+
+<style scoped>
+.fade-enter-active,
+.fade-leave-active {
+  transition: opacity 0.3s;
+}
+
+.fade-enter,
+.fade-leave-to {
+  opacity: 0;
+}
+</style>