fix: enhance some interactive experiences

src/components/form/SiteAddEditForm.vue

@@ -121,6 +121,9 @@ async function updateSiteInfo() {
 <template>
   <VDialog
     scrollable
+    :close-on-back="false"
+    persistent
+    eager
     max-width="60rem"
   >
     <VCard

src/views/setting/AccountSettingSystem.vue

@@ -214,6 +214,7 @@ async function loadDownladerSetting() {
         TR_USER,
         TR_PASSWORD,
       }
+      downloaderTab.value = DOWNLOADER === 'qbittorrent' ? 'qbittorrent' : 'transmission'
     }
   }
   catch (error) {

src/views/site/SiteCardListView.vue

@@ -68,6 +68,7 @@ onBeforeMount(fetchData)
     @click="siteAddDialog = true"
   />
   <SiteAddEditForm
+    v-if="siteAddDialog"
     v-model="siteAddDialog"
     oper="add"
     @save="siteAddDialog = false; fetchData()"