Move full and incremental ingestion, source snapshots, path keys, and download exclusion to native transactions. Preserve schema 17, FTS, WAL coordination, cancellation, and Android SAF timestamp backfill.
Port the pinned Material quantizer and Dart RNG compatibility to Rust while keeping Material Score and final color schemes in Dart. Include exact palette fixtures, licenses, and Kotlin worker ABI coverage.
Introduce Android, iOS, and Dart worker dispatch with queued cancellation, binary inputs, and background JSON codecs. Move APK verification to streamed native SHA256 while retaining the isolated fallback.
Open temporary media directory grants for reading, embedding and exporting lyrics on iOS and Android. Resolve native file aliases consistently while retaining extension storage restrictions.
Validate with 4 iOS integration tests, 42 Flutter tests, 6 Rust file capability tests, and Android Kotlin compilation. Refs #631.
Handle feature and featured separators across display, Android finalization and Rust tag writing. Split conjunction credits only when separate artist IDs confirm them, and offer a picker for multi-artist navigation.
Android's regex engine rejects Pattern.UNICODE_CHARACTER_CLASS, so NativeFinalizationPolicy failed to initialize and every native download crashed while writing metadata. List Unicode spaces explicitly and cover the separator with a device test.
Path and SAF scans wait at their next file checkpoint while paused and keep their position in memory. Cancel, backend shutdown and released request leases still end a paused scan.
Release signing now also writes the V4 .apk.idsig beside each APK, verifies it in CI and publishes it for adb incremental installs. Normal installers keep using the V1-V3 signatures inside the APK.
SD cards, USB drives and network shares pay a provider round trip per query. Folder listings are now prefetched four at a time while the walk stays serial, so order, deduplication and error counts are unchanged. Full and incremental scans share a six-worker in-order read pool; incremental scans were fully serial.
Changed files reuse the listing's name and timestamp, CUE copies skip the name and MIME queries, and directories holding CUE sheets are not listed twice.
Android froze the process once the activity stopped, because only track downloads held a foreground service. A dataSync BackgroundWorkService with a partial wake lock now covers library scans and in-app APK downloads, and stops when the last task ends or the system timeout fires. Its notification shows the existing localized progress, so no duplicate appears. If Android refuses the service, work continues as before.
On iOS a scan holds its own background task; on expiry it cancels the scan cleanly instead of being suspended.
Native tag writers accept artist_tag_mode=primary and keep only the first credited artist in ARTIST and ALBUMARTIST for every format: FLAC download embedding, FLAC/Opus edits, and the ID3, MP4, APE and RIFF writers. The Android finalizer's FFmpeg fallback applies the same rule.
Rust and Kotlin share one separator set (comma, semicolon, ampersand, a spaced x, feat/ft/featuring/with) and test the same fixtures. The Go-parity split_vorbis pattern is unchanged. Refs #618.
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