codeg v0.15.8

Release version 0.15.8

• feat(chat): Start a quick conversation without picking a project folder — a new "Chat" section sits at the top of the sidebar. While you're in a chat, the folder/branch pickers and side panel step aside.
• feat(sidebar): Start a new conversation right from any folder header, with a consistent icon everywhere.
• feat(chat): The message navigator is now a single chip next to the plan and sub-agent chips — open it to jump between your messages and see each one's changed files and diff.
• feat(tabs): Middle-click a tab to close it — in the session, file, and terminal tab bars.
• fix(settings): The Settings menu now lines up neatly and scrolls when it's taller than the window.
• style(chat): The composer's "+" button is toned down to match the selectors next to it.

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发布版本 0.15.8

• 功能(聊天)：无需选择项目文件夹即可快速开始对话——侧边栏顶部新增「聊天」分组。聊天时，文件夹/分支选择器和侧边面板会自动让位。
• 功能(侧边栏)：可直接从任意文件夹标题栏新建对话，新建图标全局统一。
• 功能(聊天)：消息导航器改为与计划、子智能体并列的单个浮层图标——点开即可在你发送的消息间跳转，并查看每条消息的改动文件与差异。
• 功能(标签页)：中键点击即可关闭标签——会话、文件、终端标签栏均支持。
• 修复(设置)：设置菜单对齐更整齐，超出窗口高度时可滚动。
• 样式(聊天)：输入框「+」按钮颜色调淡，与旁边的选择器保持一致。