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3c8e8da495
Root cause of the tab freeze on ~1700-node files was G6's default entrance animation: measured 1700 nodes at >2 min animated vs 1.5 s with animation: false. Secondary cost was antv-dagre (~7 s at that size); since IsChildOf is a tree, an O(n) tidy layout (depth = rank, post-order leaf slots, parents centered) computed client-side replaces it and renders the same file in ~1.4 s. A guard skips auto-render above 4000 nodes with an explicit Render-anyway button, so opening the console with a huge session loaded stays responsive.
Folding is now switchable ('fold containers' checkbox, persisted in localStorage) and generalized: any node with children folds except the IsChildOf root of the loaded graph, so Documents (and later Projects/Teams) fold automatically once they gain a parent node.
Signed-off-by: Álvaro Tejero Cantero <alvorithm@teje.ro>