lazy-list-drag-reorder

A complete drag-to-reorder state holder for a lazily composed Compose list — pointer offset accumulation, target-index math over the visible window, how the lift animation and the built-in item placement animation must not overlap, edge auto-scroll as a delta the caller drives, and the commit-on-drop contract with the data layer. Use when building reorder, or when a dragged row snaps back to its old slot, jitters as…