[Manager] Fix loading state on uninstall button (#3413)

src/components/dialog/content/manager/button/PackInstallButton.vue

@@ -5,8 +5,10 @@
       nodePacks.length > 1 ? $t('manager.installSelected') : $t('g.install')
     "
     severity="secondary"
+    :loading="isInstalling"
     :loading-message="$t('g.installing')"
     @action="installAllPacks"
+    @click="onClick"
   />
 </template>
 
@@ -31,6 +33,10 @@ const { nodePacks } = defineProps<{
 
 const isInstalling = inject(IsInstallingKey, ref(false))
 
+const onClick = (): void => {
+  isInstalling.value = true
+}
+
 const managerStore = useComfyManagerStore()
 
 const createPayload = (installItem: NodePack) => {