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BackupEngine: - fetchAssets() runs in Task.detached — prevents 100-500ms UI freeze during PHFetchResult enumeration on large libraries - Manifest JSON decode + ManifestIndex Set construction run in Task.detached - pendingAssets filter runs in Task.detached — O(N) array filter off main thread - Progress updates throttled to 8 Hz via ProgressThrottle — eliminates the continuous SwiftUI full-tree redraws caused by per-byte upload callbacks - bytesSoFar captured by value in upload closure — avoids mutable var capture - reserveCapacity on manifestEntries array - os_signpost intervals on FetchAssets, NASConnect, ManifestLoad, BuildPendingQueue, UploadLoop, UploadFile for Instruments profiling BackupStatusService: - countSafe() marked nonisolated — runs in Task.detached off main actor, keeping touch/animation responsive during PHFetchResult batch enumeration - ManifestIndex JSON decode + Set construction run in Task.detached - Bootstrap ManifestIndex(nasListing:) construction off main actor - writeManifest JSON decode/encode/merge off main actor - os_signpost intervals on Reconcile, ManifestLoad, CountSafe Model types: - ManifestIndex, ManifestEntry, PhotoAsset, BackupFilter marked Sendable — safe to pass across task boundaries without warnings Co-Authored-By: Kutesir <kutesir@provoc.ug> Co-Authored-By: Sentry <sentry@provoc.ug>