fix: complete subagent output and file workspace interactions

OpenCode child cards now show ordered text, reasoning and tool progress,
with the final result displayed separately. Local SDK and remote ACP paths
share child tracking, including progress retained across recovery and cancellation.
Remote live progress requires an Agent package containing the event plugin;
older Agent packages still expose final results without inventing missing history.

Knowledge-library rows remain clickable when native label activation changes
focus. File workspace changes use colored Git status letters and per-file
staged/unstaged diffs, including deleted, renamed and untracked files.
Refreshing reloads the selected diff and expanded directories, and more than
50 changes remain accessible through incremental loading.

Validated with 3552 passing tests, typecheck, lint, desktop build, current-source
Linux Host scenarios and isolated Windows desktop UI interactions.

Release note: 展开 OpenCode 子代理卡片可查看执行过程、工具详情与独立最终结果；知识库支持整行勾选。工作区支持单文件暂存与未暂存差异，刷新会更新当前差异，更多变更可继续加载。远端实时过程需要更新 GoodBuddy Agent。

docs/features/knowledge-base/progress.md

@@ -26,6 +26,12 @@
   有效 Open XML DOCX 与两页原生文本 PDF 均通过生产 `KnowledgeService.importPaths`
   导入、解析、分块和全文检索。
 
+2026-09-06 对话知识库选择补充验证：
+
+- `App.test.tsx` 覆盖点击名称、文档数量和行本身时切换选中状态，以及空目标失焦时
+  弹层不提前卸载。Windows 隔离桌面实际点击名称后选中、点击数量后取消，弹层保持打开。
+- 本轮全量校验结果见[工作栏验证记录](../assistant-workbar/progress.md)；本项验证未调用模型。
+
 ## 剩余工作
 
 - 外部 Dify、FastGPT 和 RAGFlow 知识库接入仍为规划中能力。