feat(workspace): 工作区浏览器后退历史与离开守卫 - #663
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为工作区实现完整的浏览器返回键行为，全平台生效（Web 桌面/移动端、桌面客户端，不区分视口）。
后退历史（WorkspaceWindowHistoryProvider）：将所有抽屉、内存路由页、文件编辑工作区以 LIFO 栈镜像到浏览器历史，按返回键逐层关闭窗口而不是离开 /workspace。落在已卸载窗口的幽灵条目上自动跳过；关闭处理器可 veto（如文件未保存），veto 时补回历史条目。UI 主动关闭时延迟执行 history.back() 并校验当前条目，修复"关抽屉+开文件页"同提交的指针错位竞态。
离开守卫（WorkspaceLeaveGuard）：历史栈用尽后再后退将离开 /workspace 时弹确认；Web 端刷新/关闭页面经 beforeunload 提示（桌面客户端豁免）。
涉及文件
新增：workspace-window-history.tsx、workspace-leave-guard.tsx
接入：drawer.tsx、workbench-route-context.tsx、workspace-context.tsx（closeAllFileTabs 返回 boolean 支持 veto）