dsh-ask-in-sidebar: A Sidebar Ask Plugin Based on Main Conversation Snapshots

The `dsh-ask-in-sidebar` plugin addresses the need for DSH Web users to ask targeted follow-up questions about assistant responses in the main conversation. By creating an isolated sidebar panel, users can select text and conduct streaming discussions based on a snapshot of the main conversation, without disrupting the coherence of the main conversation. The plugin supports Markdown rendering, display of the thinking process, and context reuse, making it suitable for in-depth exploration while maintaining the integrity of the main conversation, though it relies on a local environment and specific UI conventions.