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zarzet
6b342aeac6
Introduce a service-owned download worker that offloads the full download-and-finalize pipeline to DownloadService on Android, keeping downloads alive independently of the Flutter UI process. Key changes: - Extract SAF download logic from MainActivity into SafDownloadHandler - Add NativeDownloadFinalizer for Kotlin-side decryption, format conversion, metadata embedding, ReplayGain, post-processing, and history persistence - Extend DownloadService with native queue management (start, pause, resume, cancel) using coroutine-based worker with AtomicFile snapshots - Add Dart-side orchestration: snapshot polling, run-id correlation, adoption on app restart, and fallback to Dart queue - Forward embedReplayGain, tidalHighFormat, and postProcessingEnabled through Go backend DownloadRequest struct - Add nativeDownloadWorkerEnabled setting with UI toggle - Make DownloadQueueLookup collections unmodifiable