feat(chat): queue repeated messages from trailing xN intent

[ijry]

Summary

Detect trailing repeat multipliers like 继续X10 / continue x 3 in the chat composer, confirm with a dialog, and enqueue N identical base messages into the existing pending queue.

English

• Parse trailing x / X + digits (optional spaces) on send
• Valid count range: 2..50
• Confirm dialog before expanding; cancel keeps the original composer text
• On confirm, bulk-enqueue N base drafts via atomic enqueueMany
• Skip detection while editing a queue item
• If no enqueue path is available, fall back to normal single send of the original draft
• i18n strings added across all locales under Folder.chat.messageQueue

中文

• 发送时识别末尾的 x / X + 数字（兼容大小写与空格），例如 继续X10、继续 x 10
• 合法次数范围：2..50
• 弹出确认框后再展开；取消/关闭时保留原始输入（含 xN）
• 确认后通过原子 enqueueMany 一次性生成 N 条待发送基础消息
• 队列项编辑模式下不触发识别
• 若当前界面没有入队能力，则回退为正常单次发送原始草稿
• 全部语言包补齐 Folder.chat.messageQueue 下的文案

Behavior examples

Input	Result
继续X10	dialog → queue 10 × 继续
继续 x 10	dialog → queue 10 × 继续
continue X 3	dialog → queue 3 × continue
继续x1 / 继续x51	no match, normal send
继续X10 请	no match (not trailing)

Test plan

• pnpm exec vitest run src/lib/repeat-intent.test.ts
• pnpm exec vitest run src/hooks/use-message-queue.test.ts
• pnpm exec vitest run src/i18n/messages.test.ts
• pnpm exec vitest run src/components/chat/message-input.test.tsx
• Manual: type 继续x10, confirm → 10 pending messages appear
• Manual: cancel dialog → composer text unchanged
• Manual: queue-item edit with xN suffix → saves edit, no dialog