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The recursive RenderNode rendered every row of an expanded device, and built a fresh context-menu list + closures per node per render. RawTreeRows flattens the expanded tree (explicit stack) into rows rendered by one Virtualize; each level shows 500 children, then a 'Show more' row. RawNodeMenuCache keys menus weakly on the node instance and rebuilds on a picker-mode or Enabled change. Refs #745 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT