新增: 待发箱抽屉与对话体验前端批

- 待发箱抽屉: ChatInput ⏰ 入口 + OutboxDrawer + useAiOutbox IPC 封装
- U2 进度语义三层: 内容层(最近动作) + 静默三档降速脉冲, 永不自动判死
- 流式心跳自愈: 竞态窗口旧任务迟到完成事件误收敛的自愈判定(949 前端兜底)
- 953 截断提示: 末条气泡渲染截断标记 + 继续输出按钮, 事件契约透传

src/i18n/en/aiChat.ts

@@ -113,6 +113,7 @@ export default {
     examplePrompt4: 'Generate a project idea',
     goToSettings: 'Open settings',
     goToSettingsHint: 'The detached window cannot open settings directly. Configure AI providers on the main window’s Settings page.',
+    goToSettingsOpened: 'Settings opened in the main window',
     goToTaskHint: 'The detached window cannot open tasks directly. View task details in the main window.',
 
     // ── Provider switch feedback ──
@@ -125,6 +126,8 @@ export default {
     // ── Pending queue ──
     queueTitle: 'Queued {n}/10',
     clearQueue: 'Clear',
+    // UI-4 (board 943): clear-queue confirm (one click wipes all queued items, unrecoverable)
+    clearQueueConfirm: 'Clear all queued messages? This cannot be undone',
     // queue item edit + send now
     queueEdit: 'Edit',
     queueSave: 'Save',
@@ -339,5 +342,26 @@ export default {
     editEmptyBlocked: 'Edit content is empty, submission cancelled',
     skillNoMatchQuery: 'No skill matches "{q}", send blocked',
     backfillOverwriteConfirm: 'The input box has an unsent draft; backfilling will overwrite it. Continue?',
+
+    // ── Outbox / scheduled messages (OutboxDrawer + ChatInput clock entry, design 2026-10-10 §3.4) ──
+    outboxEntry: 'Scheduled messages',
+    outboxTitle: 'Scheduled & Outbox',
+    outboxEmpty: 'No scheduled or queued messages',
+    outboxNewTitle: 'New scheduled message',
+    outboxNewPlaceholder: 'Content to send on schedule',
+    outboxTimeLabel: 'Send time',
+    outboxCreate: 'Schedule',
+    outboxReschedule: 'Reschedule',
+    outboxSendNow: 'Send now',
+    outboxCancel: 'Cancel',
+    outboxQueueAsap: 'ASAP',
+    outboxStatusPending: 'Pending',
+    outboxStatusSending: 'Sending',
+    outboxStatusSent: 'Sent',
+    outboxStatusFailed: 'Failed',
+    outboxStatusCanceled: 'Canceled',
+    outboxActionFail: 'Action failed, please retry',
+    outboxDuePast: 'Scheduled time must be in the future',
+    outboxNeedConv: 'No target conversation; create one first',
   },
 }