dsh-composer-alcove: Collapse the Input Box When Reading Long Replies

The DeepSeek Harness (DSH) plugin `dsh-composer-alcove` is designed to address the issue of the input box obscuring the view in long conversations. It collapses the official input box into a Home indicator bar and docks it in the blank spaces on either side of the screen using rounded arcs. Users can preview it by hovering with the mouse or click it to expand or pin it, while the send and model-switching controls remain fully functional, thereby freeing up more screen space for reading. The plugin is open source under the MIT license and must be installed via the command line, followed by restarting the process to take effect.