Compact header affordance that surfaces the workflow's family relationships at a glance:

• Child views render a ↑ Child of <short_id> link that navigates to the parent's flow page.
• Parents with children render a <N> children chip that, on click, expands to a small dropdown listing each child with its status pill, the parallel-step it ran, and a deeplink. Implemented via the native <details> element so it stays accessible without a Phoenix.LiveView round-trip.

Every chip is rendered as a horizontal row of plain links — small, monospaced, and visually subordinate to the workflow name + status pill that already live in the header.