The desktop app can quit while a preview-driven Bash task is still running npm/vite. Bash commands are spawned as detached process groups, so killing only the CLI or shell process can leave descendant dev servers alive and make later app launches look stuck.
This gives the CLI enough shutdown budget to run cleanup, lets the native sidecar wait long enough for that server cleanup, kills detached Bash process groups before the existing tree-kill fallback, and closes the native preview WebView instead of hiding it on workbench unmount.
Constraint: CLI gracefulShutdown has a 5s failsafe, so outer desktop shutdown windows must not SIGKILL it after 2-3s
Rejected: Treat the browser preview as the dev-server owner | it only opens URLs and does not spawn npm/vite
Confidence: high
Scope-risk: moderate
Directive: Do not shorten desktop/server shutdown windows below the CLI cleanup budget without reproducing BashTool background-task teardown
Tested: bun test src/utils/ShellCommand.test.ts src/server/__tests__/conversation-service.test.ts
Tested: cd desktop && bun run test -- --run src/components/browser/BrowserSurface.test.tsx src/components/workbench/WorkbenchPanel.webview.test.tsx
Tested: cd desktop && bun run lint
Tested: bun run check:server
Tested: SKIP_INSTALL=1 ./desktop/scripts/build-macos-arm64.sh
Tested: Opened canonical app and generated DMG app; both showed visible/frontmost window and left no app/sidecar/vite processes after quit
Not-tested: Notarized release install path
