feat: add i18n to ScheduledTasks page

Translate the scheduled tasks header, subtitle, desktop notice,
and new task button that were missed in the initial i18n pass.

desktop/src/i18n/locales/en.ts

@@ -278,8 +278,10 @@ export const en = {
   'teams.members': 'members',
 
   // ─── Scheduled Tasks Pages ──────────────────────────────────────
-  'scheduledPage.title': 'Scheduled Tasks',
+  'scheduledPage.title': 'Scheduled tasks',
-  'scheduledPage.subtitle': 'Manage automated operational routines and background maintenance.',
+  'scheduledPage.subtitle': 'Run tasks on a schedule or whenever you need them. Type {code} in any existing session to create one.',
+  'scheduledPage.desktopNotice': 'Scheduled tasks only run while the desktop app is open. Make sure it stays running for tasks to fire on time.',
+  'scheduledPage.oldSubtitle': 'Manage automated operational routines and background maintenance.',
   'scheduledPage.executionMode': 'Execution Mode',
   'scheduledPage.localMode': 'Local Mode',
   'scheduledPage.remoteMode': 'Remote Mode',

desktop/src/i18n/locales/zh.ts

@@ -281,7 +281,9 @@ export const zh: Record<TranslationKey, string> = {
 
   // ─── Scheduled Tasks Pages ──────────────────────────────────────
   'scheduledPage.title': '定时任务',
-  'scheduledPage.subtitle': '管理自动化运维流程和后台维护任务。',
+  'scheduledPage.subtitle': '按计划或在需要时运行任务。在任意会话中输入 {code} 即可创建。',
+  'scheduledPage.desktopNotice': '定时任务仅在桌面应用打开时运行。请确保应用持续运行以按时触发任务。',
+  'scheduledPage.oldSubtitle': '管理自动化运维流程和后台维护任务。',
   'scheduledPage.executionMode': '执行模式',
   'scheduledPage.localMode': '本地模式',
   'scheduledPage.remoteMode': '远程模式',

desktop/src/pages/ScheduledTasks.tsx

@@ -1,6 +1,7 @@
 import { useEffect, useState } from 'react'
 import { useTaskStore } from '../stores/taskStore'
 import { useUIStore } from '../stores/uiStore'
+import { useTranslation } from '../i18n'
 import { Button } from '../components/shared/Button'
 import { TaskList } from '../components/tasks/TaskList'
 import { TaskEmptyState } from '../components/tasks/TaskEmptyState'
@@ -9,6 +10,7 @@ import { NewTaskModal } from '../components/tasks/NewTaskModal'
 export function ScheduledTasks() {
   const { tasks, fetchTasks, isLoading } = useTaskStore()
   const { activeModal, openModal, closeModal } = useUIStore()
+  const t = useTranslation()
   const [initialized, setInitialized] = useState(false)
 
   useEffect(() => {
@@ -21,19 +23,22 @@ export function ScheduledTasks() {
         {/* Header */}
         <div className="flex items-center justify-between mb-4">
           <div>
-            <h1 className="text-2xl font-bold text-[var(--color-text-primary)]">Scheduled tasks</h1>
+            <h1 className="text-2xl font-bold text-[var(--color-text-primary)]">{t('scheduledPage.title')}</h1>
             <p className="mt-1 text-sm text-[var(--color-text-secondary)]">
-              Run tasks on a schedule or whenever you need them. Type <code className="px-1 py-0.5 rounded bg-[var(--color-surface-container)] text-xs font-[var(--font-mono)]">/schedule</code> in any existing session to create one.
+              {(() => {
+                const parts = t('scheduledPage.subtitle').split('{code}')
+                return <>{parts[0]}<code className="px-1 py-0.5 rounded bg-[var(--color-surface-container)] text-xs font-[var(--font-mono)]">/schedule</code>{parts[1]}</>
+              })()}
             </p>
           </div>
-          <Button onClick={() => openModal('new-task')}>+ New task</Button>
+          <Button onClick={() => openModal('new-task')}>{t('tasks.newTask')}</Button>
         </div>
 
         {/* Desktop-online notice */}
         <div className="flex items-center gap-2.5 px-3.5 py-2.5 rounded-[var(--radius-md)] bg-[var(--color-warning)]/8 border border-[var(--color-warning)]/15 mb-6">
           <span className="material-symbols-outlined text-[18px] text-[var(--color-warning)]">schedule</span>
           <span className="text-xs text-[var(--color-text-secondary)]">
-            Scheduled tasks only run while the desktop app is open. Make sure it stays running for tasks to fire on time.
+            {t('scheduledPage.desktopNotice')}
           </span>
         </div>