test: stabilize conversation capture checks in release CI

Focus the real Electron window before native keyboard input and give the
two long-history App scenarios the existing 15-second per-test allowance.
Keep all capture, source navigation, persistence, and keyboard assertions.

Record the initial Linux CI failures and the revised local validation:
5317 passed, 79 skipped, with typecheck, lint, and release notes verified.
Product behavior and approved Desktop/Agent 0.15.0 notes are unchanged.

docs/quality/recurring-defects.md

@@ -43,6 +43,9 @@ main CI `36164698647`：原生能力重试用例在启动状态未稳定时打
 是否消除 CI 失败以修复提交的 Linux CI 结果为准。
 同日 Windows 全量测试及独立复跑中，Magic Notes 原生拖拽分别停在索引列 168 和
 AI 列 280。测试同步原生输入与实际状态后独立复跑通过，保留原有宽度和持久化断言。
+2026-09-27 的 0.15.0 主分支 CI 中，会话采集测试向隐藏 Electron 窗口发送 Escape，
+未返回笔记列表。原生键盘辅助函数同样必须显示窗口、取得焦点并等待
+`document.hasFocus()`，再发送输入；不靠跳过 Linux 或关闭沙箱处理。
 
 ## 整窗遮罩与原生拖动区域