Introducing the DeepSeek Harness Chat Control Plugin

`dsh-harness-chat-control` is an open-source plugin that provides a ChatGPT-like interaction experience for DeepSeek Harness Desktop. It allows users to quote from the main conversation within responses via the action bar or selected text, with quoted content displayed as capsules and supporting editing and resending. The plugin also includes a built-in sidebar for independent follow-up questions on quoted content and for editing user messages to resend. Compatible with specific versions of DSH Desktop, it aims to improve the operational efficiency of multi-turn conversations.