feat(gui): 任务栏图标运行状态指示（变色 + 数量圆点） - #280
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Mirror the number of running conversations onto the desktop shell so users can see agent progress without focusing the window: - Windows: tint the taskbar icon amber while tasks run and overlay a red badge showing the count (1-9, then 9+) rendered from an embedded 3x5 bitmap font — no new dependencies. Both reset when idle. - macOS: native Dock badge via set_badge_count (Dock icon tinting is not exposed by Tauri 2.11.5). - Linux: set_badge_count best effort (Unity-style desktops). The frontend syncs runningConversationIds.size through the new taskbar_set_activity command and clears the badge on unmount.
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Jul 27, 2026
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复核最新提交 feac4dd2，确认有一项 Windows 图标恢复问题：
P3 · 请恢复 Tauri 实际配置的默认窗口图标
crates/agent-gui/src/pages/chat/hooks/useTaskbarActivity.ts:16 会在首次挂载时立即发送 count = 0，因此 crates/agent-gui/src-tauri/src/commands/app/taskbar.rs:70 在应用刚启动、尚无任务时就会替换启动图标。
当前 Windows 配置使用 icons/icon-windows.ico。Tauri 2.11.5 / tauri-codegen 2.6.3 会从该 ICO 的第一个 16×16 frame 构造默认窗口图标；这里却用 128x128-windows.png 调用 set_icon()。这不是恢复原始 icon，而是换成另一个尺寸的 HICON，标题栏/任务栏图标可能发生可见变化或被重新缩放。每次任务归零也会重复替换。
建议从 window.app_handle().default_window_icon() 恢复 Tauri 实际使用的默认图标（或在首次变色前保存原 icon），不要用单独的 PNG 作为“原状”。现有 Rust 测试覆盖了角标绘制，但没有覆盖默认图标恢复语义。
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功能
有任务（会话正在生成回复）进行时，任务栏/Dock 图标给出可见指示；全部结束后自动恢复原状：
set_icon换成琥珀色着色图标set_overlay_icon叠加红底白字角标（1-9，超过显示 9+）set_badge_count原生 Dock 红点数字set_badge_count尽力而为（Unity 系桌面）实现
ChatPage已维护并发运行会话集合runningConversationIds，新增useTaskbarActivityhook 把size经新命令taskbar_set_activity同步给桌面端；组件卸载时清零，invoke 失败静默（不影响聊天主流程）。commands/app/taskbar.rs）：128x128-windows.png上做 55% 琥珀色线性混合，双双缓存于OnceLock；#[cfg]分发。验证
cargo test taskbar --lib：4 个单元测试通过（字形上限 9+、圆形角标透明边界与文字像素、不同数量渲染差异、着色保留 alpha）；set_overlay_icon/set_icon/Image::*）已在x86_64-pc-windows-msvc目标下编译验证；tsc、biome（触及文件零新增告警）、pnpm test:frontend（1285 通过）、mirror check（109 文件）、git diff --check全部通过；