fix: toast message not visible

When install plugin failed, it will yield an error toast. But attribute `z-index` of toast is `1090`, while `v-dialog` is `2400`

src/views/plugin/PluginCardListView.vue

@@ -105,6 +105,7 @@ onBeforeMount(() => {
     fullscreen
     scrollable
     :scrim="false"
+    :z-index="1010"
     transition="dialog-bottom-transition"
   >
     <!-- Dialog Activator -->