主对话区支持智能粘底：流式输出时自动跟到底部；上滑看历史时不抢滚动，并提示「有新内容 / 回到底部」；刷新后任务补流与直接发送使用同一跟随策略。对话区「选择项目」浮层底部新增**「新建项目」**，可直接创建并自动绑定当前对话，无需进入项目管理页。
The main chat now uses smart stick-to-bottom: auto-follow during streaming, no scroll hijacking when you read history (with a “new content / scroll to bottom” hint), and the same follow behavior for live sends and post-refresh task replay. The chat “Select project” popover now includes a “New project” action at the bottom so users can create and bind a project to the current conversation without opening Project Management.