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Psychotoxical
635a59f133
Pull the duplicated `subsonic UA + timeout client builder` and `stream → .part → rename → cleanup` flow out of cache/offline.rs, sync/device.rs, and sync/batch.rs into a new lib_commands/file_transfer module. - subsonic_http_client(timeout): standard UA + single timeout. Used by the 3 simple-timeout sites (offline track, sync_track, batch sync). download_update / download_zip / fetch_netease_lyrics keep their own builders since they need separate connect+overall timeouts or extra headers. - stream_to_file(response, dest): chunked HTTP body → file (moved from cache/offline.rs, where it was the de-facto shared helper anyway). - finalize_streamed_download(response, dest, part): stream to .part then rename, with best-effort cleanup of .part on any failure. Behaviour delta: the offline + device single-track flows now also clean up an orphan .part file when the final rename fails — previously only the batch sync did this. Strictly safer; no observable change on the success path. downloads.rs (download_update / download_zip) keeps its inline progress chunk loops — those emit per-chunk progress events with flow-specific payload shapes and intervals; sharing them would force a callback API that's heavier than the duplication it removes. Net delta: -53 LOC across the 3 call sites.