Idreamxkl/dsh-conversation-flat

Conversation UI upgrades for DeepSeek Harness Web GUI: document-flow layout (full-width column, user message bars, sender label, full-width tables) plus a conversation minimap — a vertical ruler at the message-area edge with one tick per message, hover previews and click-to-jump. Colors follow the active theme; every side effect is registered through ctx.effect so disable/remove fully reverts the page.