Release version 0.21.6

• feat(git-log): A rebuilt Commit history tab. Virtualized and paged for long histories, with branch and author filters, a pushed/not-pushed marker on every commit, and your filter choices remembered per folder.
• feat(sidebar): Group sessions by git worktree. Turn on "Show worktree folders" to nest each worktree under its repo as a collapsible, branch-labelled sub-group. On by default now, alongside "Show completed."
• feat(delegation): Mention an agent with @ to hand it the work. Naming a sub-agent in your message now delegates that work straight to it — one delegation per agent named.
• feat(chat): View a diff from a reply's changed files. Each modified file now has a View Diff button that opens its diff in an editor tab, on web and desktop.
• feat(layout): Session stats on mobile. The mobile status bar now shows your session stats on the left.
• fix(chat): No more phantom tool cards after a turn ends. Empty tool calls left by interrupted or retried turns no longer resurface and inflate the tool-group and poll cards.
• fix(messages): The focus ring follows your keyboard, not your mouse. Clicking a message no longer leaves a focus outline; keyboard navigation still shows one. Thanks to @youxikexue (#338).
• fix(chat): A tidier connection indicator. It now aligns with the send button and uses a muted colour when connected instead of a green heart.
• fix(layout): No stray scrollbar on the branch selector. The popup now sizes to its rows, so filtered lists have no leftover scrollbar or empty space.
• chore(acp): Refreshed the bundled agent versions. Claude Code 0.61.0, Gemini 0.52.0, CodeBuddy 2.126.0, Kimi Code 0.29.0, Grok 0.2.111, and Cursor 2026.07.20.

发布版本 0.21.6

• 功能(提交历史)：重建的「提交」标签。 虚拟化分页加载，长历史也流畅，支持按分支与作者筛选，每条提交显示是否已推送，筛选选择按文件夹分别记住。
• 功能(侧边栏)：按 git 工作树分组会话。 打开「显示工作树文件夹」，即可把每个工作树作为可折叠、以分支命名的子分组归到所属仓库下。现与「显示已完成」一并默认开启。
• 功能(委派)：用 @ 提及某个智能体，即可把工作交给它。 在消息中点名子智能体，现在会直接把这部分工作委派给它——点名几个就生成几个委派。
• 功能(聊天)：在回复的变更文件上查看 diff。 每个被修改的文件现在都带「查看 Diff」按钮，点击即在编辑器标签中打开其 diff，网页端与桌面端均可用。
• 功能(布局)：移动端显示会话统计。 移动端状态栏现在在左侧显示你的会话统计。
• 修复(聊天)：回合结束后不再残留幽灵工具卡片。 中断或重试回合留下的空工具调用，不再重新出现并撑大工具分组与轮询卡片。
• 修复(消息)：焦点框跟随键盘，而非鼠标。 点击消息不再留下焦点轮廓，键盘导航时仍会显示。感谢 @youxikexue 的贡献（#338）。
• 修复(聊天)：更整洁的连接指示。 现在与发送按钮对齐，「已连接」时改用柔和色而非绿色心形。
• 修复(布局)：分支选择器不再出现多余滚动条。 弹层现在按其行高自适应，筛选后的列表既无残留滚动条也没有空白。
• 维护(智能体)：刷新内置的智能体版本。 Claude Code 0.61.0、Gemini 0.52.0、CodeBuddy 2.126.0、Kimi Code 0.29.0、Grok 0.2.111，以及 Cursor 2026.07.20。