Keep successful background conversations in project activity until their chat is visible and loaded. Track completion in memory for the current client session; initial history, failures and cancellations do not create completion notices.
Include whole-file companion changes already present in App and shared UI: preserve the workspace beneath Settings, show inline reply-copy feedback, and keep project settings inside the project menu. Include their component tests and documentation; navigation demo source changes remain unstaged.
Validation: 77 focused activity tests, typecheck and lint passed; Electron component fixtures passed 112 checks. Full suite: 4365 passed, 3 failed, 67 skipped (offline inventory timeout and two heartbeat migration failures). Commit-time staged whitespace check passed; tests were not rerun.
Release note: 后台会话完成后保留已完成提示，进入对应聊天后自动清除，避免错过任务结果。
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