Allow disabling/remapping the "Ctrl+C twice to exit" behavio

Describe the feature or problem you'd like to solve

Feature request: Allow disabling/remapping the "Ctrl+C twice to exit" behavior. I frequently use Ctrl+C out of habit (from other terminal tools) for two purposes: (1) cancelling an in-progress operation, and (2) copying selected text. In both cases, a second incidental Ctrl+C press exits the CLI entirely and loses my session context. This is especially disruptive since Ctrl+C for copy is a standard OS/terminal convention outside this CLI. Suggest adding a setting (e.g.,  /settings set ctrlCExit false ) to disable exit-on-double-Ctrl+C, keeping Ctrl+C available for cancel/copy, with Ctrl+D remaining as the explicit shutdown key.

Proposed solution

No response

Example prompts or workflows

No response

Additional context

No response

首先跟踪 CLI 对 Ctrl+C 的处理，以及现有的 settings 命令或配置入口；issue 中没有指定具体文件或测试。确认取消、与复制相关的 Ctrl+C 按键、双击退出以及使用 Ctrl+D 关闭当前是如何相互作用的，然后验证在不移除显式关闭路径的情况下，是否可以禁用或重新映射该行为。