feat: Add prompt undo and redo shortcuts#59
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Adds Emacs-style undo/redo for the prompt input buffer: - ctrl+- (undo): reverses text changes one step at a time, all the way back to the initial empty buffer. Uses an undo stack capped at 1000 entries. - ctrl+shift+- (redo): restores undone changes one step at a time. New edits clear the redo history. - Pure cursor movement does not create undo entries. - Terminal input parsing handles modifyOtherKeys CSI sequences: \u001B[45;5u and \u001B[27;5;45~ for undo, \u001B[45;6u and \u001B[27;6;45~ for redo, plus raw 0x1F as redo fallback.
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背景
Prompt 输入目前支持多种编辑快捷键，但缺少常见的撤销和重做能力。终端在不同按键模式下对 Ctrl+- / Ctrl+Shift+- 的上报不同，本次改动在已有 extended key reporting 基础上兼容常见序列，并保持标准 redo 语义：新编辑会清空 redo 历史。
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