Desktop app: allow "Start locally" as the default action on task chips

In the Claude Code desktop app (Code tab), task suggestion chips created by a session (`spawn_task`) show two actions: "Start with worktree" as the primary button and "Start locally" as secondary.

My workflow is main-branch only, no worktrees, so I click "Start locally" every time. There is no setting to change the default. I tested `worktree.bgIsolation: "none"` in settings.json (with an app restart) and the chip still defaults to worktree.

Request: a setting (settings.json or app preference) to pick the default chip action, or have the chip respect `worktree.bgIsolation`.

Version: desktop app on macOS, Claude Code 2.1.239.