dsh-turn-outline: DSH Turn Trace Sidebar

`dsh-turn-outline` is a client-side plugin for DeepSeek Chat (DSH), designed to address the difficulty of locating content in long conversations. It provides a collapsible sidebar view that structures the dialogue by user turns, displaying summaries in the format “input → tool steps → output.” The plugin supports one-click jump back to the original position, multi-level folding, and filtering by tool type. It has no AI dependencies and is non-intrusive, with performance optimized through an incremental algorithm. Installation requires `dsh-better-sidebar`, and it is compatible with DSH 0.1.x and 0.2.0-rc.x.