仿 Codex 的 DSH Web GUI 输入历史插件：会话输入框按 ↑/↓ 浏览历史 prompt，Esc清除当前对话框并进入历史，跨会话、跨重启持久保留，仅存纯文本，安全接管不误伤草稿。 A Codex-style input-history plugin for the DSH Web GUI: recall previous prompts with ↑/↓ in the composer, persisted across conversations and restarts, text-only storage with safe key routing.
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