dsh-chat-timeline: Bringing DeepSeek's Official Right-Side Conversation Navigation Bar into DSH Web

dsh-chat-timeline is maintained by jjxjjjjiik-bot, porting the ScrollNav conversation navigation track from the right side of chat.deepseek.com to the DeepSeek Harness Web interface. The plugin persistently displays a user message indicator line on the right side of the chat, supporting hover expansion, ★ key bookmarking and filtering, light/dark themes, smooth scrolling, and on-demand loading via loadOlder. It integrates with dsh-rewind to automatically exclude recalled messages. Recommended installation: `dsh plugin --profile web add dsh-chat-timeline`, effective after restarting dsh web. MIT License, Node >= 22.