perf: preload and cache countdowns

frontend/src/App.vue

@@ -6,7 +6,7 @@ import {
   Settings, Trash2, X, Repeat2,
 } from 'lucide-vue-next'
 import { filterTasks, fromDateTimeLocal, groupTaskTree, renderMarkdown, toDateTimeLocal } from './lib/task-utils'
-import { defaultView, isTaskView, nextTotalAfterLocalTaskAdd, quickTaskFields, shouldToggleRowSwipe } from './lib/mvp-utils'
+import { defaultView, isTaskView, nextTotalAfterLocalTaskAdd, quickTaskFields, shouldToggleRowSwipe, writeCountdownCache } from './lib/mvp-utils'
 import { csrfHeader } from './lib/csrf'
 import MvpPanel from './MvpPanel.vue'
 import CountdownPanel from './CountdownPanel.vue'
@@ -216,6 +216,7 @@ async function bootstrap() {
       activeList.value = data.inbox_id || lists.value.find((item: TaskList) => item.is_inbox)?.id || lists.value[0]?.id || ''
       expandedFolders.value = new Set(folders.value.map((folder) => folder.id))
       await loadArchivedLists()
+      void preloadCountdowns()
       await loadAll()
     }
   } catch {
@@ -237,6 +238,7 @@ async function submitAuth() {
     navigationLoaded.value = true
     activeList.value = data.inbox_id || lists.value.find((item: TaskList) => item.is_inbox)?.id || lists.value[0]?.id || ''
     expandedFolders.value = new Set(folders.value.map((folder) => folder.id))
+    void preloadCountdowns()
     await loadAll()
   } catch (reason) { fail(reason) }
 }
@@ -279,6 +281,14 @@ async function loadNavigation(force = false) {
   expandedFolders.value = new Set(folders.value.map((folder) => folder.id))
   await loadArchivedLists()
 }
+async function preloadCountdowns() {
+  try {
+    const active = await api('/countdowns')
+    writeCountdownCache(active ?? [], [])
+    const archived = await api('/countdowns?archived=true')
+    writeCountdownCache(active ?? [], archived ?? [])
+  } catch { /* 倒数日页会在打开时重试 */ }
+}
 async function loadAll() {
   loading.value = true; error.value = ''
   try {