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- Backend-resident SyncSession owns scan trees and runs the diff on its own boost::asio strand. - Parallel merge-walk over sorted ScanNode trees replaces the flat-vector diff; one-sided subtrees prune to O(1). - Frontend lazily fetches diff-tree children per expansion via new RPCs; no full scan payloads cross the wire. - Sparse selection model: set entries imply whole subtrees, filling out on partial toggles and collapsing up when completed. - Enqueue minimizer handles bulk vs structural directories off the sparse set. - Comparing-phase overlay driven by a backend-decided heavy-compare threshold. - Cancellation token unwinds in-flight diffs cleanly on session close and app shutdown.
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Moved sync diffing from frontend to backend.