dsh-interrupt-send: Interrupting Send via the Input Box

`dsh-interrupt-send` is a client plugin for DeepSeek Harness designed to solve the problem of being unable to immediately send a draft while the AI is thinking. The plugin adds an “Interrupt Send” button to the input box toolbar, which is displayed only when the AI is thinking and the draft is not empty. Clicking the button forcibly interrupts the current turn and submits the draft. After sending, the draft is automatically cleared and recorded in the undo history. If interruption fails, it automatically falls back to a normal send. By monitoring session state to control display, and released under the MIT License, the plugin allows users to operate flexibly during debugging or rapid interactions.