Fix drag-and-drop memory leak and reordering with variable item heights#1

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AustinMKerr wants to merge 3 commits into

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claude/complex-tree-memory-drag-odnn8b

Commits on Jun 24, 2026

fix(core): drag-and-drop memory leak and reordering with variable item heights
claude
committed
fix(core): satisfy lint (no-plusplus, unused itemHeight, prettier)
claude
committed
test(core): mock computeItemHeightArray so drag tests use 10px item heights
claude
committed