dsh-chat-tools: Chat Layout, Question History, and Markdown Outline for DSH Web Client

dsh-chat-tools is a DSH Web client plugin (v0.1.0, MIT) designed to optimize reading efficiency for long conversations. Its core features include: 1) Top-right controls that support adjusting the dialogue column width by percentage and switching between centered and left-aligned layouts, with settings automatically saved locally; 2) A question history menu with numbering, supporting quick navigation via buttons or keyboard shortcuts (Ctrl+↑/↓). History records are persisted based on session ID, with paginated loading triggered when clicking on unloaded content; 3) An outline bar generated for Markdown headings that overlays the dialogue area and the better-sidebar file preview area. Hovering displays the full outline, while clicking allows locating the heading. Installation requires manually executing `dsh plugin --profile web add dsh-chat-tools` in `cordis.pa...