Adds a "Queue subtasks sequentially" context-menu entry on rows with planning children, wires it to WorkerHub.QueuePlanningSubtasksAsync via IWorkerClient. TaskRowViewModel exposes IsWaiting/StatusChipClass for the new Waiting status, and HasPlanningChildren keeps parents expandable after they leave the planning state. TasksIslandViewModel auto-collapses parents whose every child is Done and includes Waiting children in the queued virtual list.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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