dsh-esc-enter: Esc Cancel and Append/Stop Buttons Plugin for DeepSeek Harness Web UI

The DeepSeek Harness (DSH) plugin `dsh-esc-enter` is designed to optimize Web UI interaction control. Implemented entirely on the client side, it provides two core features: first, quickly canceling the currently running task with the Esc key on the keyboard; second, offering “Append” and “Stop” buttons in the dock slot of the input box for intuitively managing instructions during a generation stream. The plugin displays the buttons only while the Agent is running and automatically hides them when idle. It does not interfere with DSH’s built-in Enter key behavior, nor does it intercept Esc key presses when idle. The installation command is `dsh plugin --profile web add github:Liangebra/dsh-esc-enter`; after restarting the service, it is ready to use, providing developers with more fine-grained task control.