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Stable generative placement keyed by identifier

Generated composition where each card takes its position, rotation and color from a hash of its own identifier rather than its index in the list, so adding, deleting or reordering never relocates the items that were already there. A switch replays the same sequence of operations with the naive index based version, and the component measures how many items move and how many pixels the set shifts under each strategy, leaving the trace per operation and the previous positions as ghosts.