Implementation plan

The rewrite is delivered in vertical slices. Each phase leaves the app in a working, testable state.

Phase 0 - Foundation (done)

Nix devshell (JDK, Gradle, Android SDK, nushell, navidrome, gonic), Gradle Kotlin DSL at the repo root, a Compose skeleton, Roborazzi/Robolectric screenshot testing, and the carried-over launcher and notification assets. The app ships as com.subtracks.next.

Phase 1 - Data foundation (done)

Everything needed to mirror a server library locally:

MusicSource abstraction with SubsonicClient, SubsonicXml and SubsonicSource.
Room 3 schema on bundled SQLite, so the SQLite version and FTS5 are identical on every device.
SyncService: fetch first, then a single transaction of upserts with diff-based pruning.
FTS5 trigram search index over titles.
Unit tests (client, XML, sync, search), native integration tests against navidrome and gonic, and CI (unit, lint, integration) with warm caches.

Phase 2 - UI vertical slice (done)

Goal: a usable app for browsing a server, end to end.

Koin DI and DataStore-backed preferences (album sort); the unused app_settings Room table was removed in favour of DataStore.
App shell: a root gate that shows the add-server flow until a server exists, then the tabbed library screen matching the Flutter app (icon-only tabs for albums, artists, songs and playlists, with sync and settings actions), plus album and playlist detail screens and a monochrome theme.
Source setup: name/address/username/password with token-auth toggle, a connection test, save-and-sync, plus server switching and removal in settings.
Library browsing: albums (covers-only grid), artists, songs and playlists paged from Room (PagingSource) and rendered with LazyPagingItems, with Coil cover art served from stable media URLs.
Roborazzi screenshots for the eight new screens, rendered on demand for review (not committed).

Not done yet in this slice (deliberately): artist detail, cover-art tonal colour extraction, long-press menus, editing an existing server, and per-section sort/filter controls (only album sort is wired).

Phase 3 - Playback (in progress)

(done) Media3/ExoPlayer playback service, queue and now-playing UI: a MediaSessionService plus a mini player and a Now Playing screen.
(done) Media notifications and headset/Bluetooth controls, from the media session.
(done) A SQL-backed queue of references (whole playlist / album / song, each with an optional ordinal range) resolved lazily, with only a bounded window in memory and in the player.
(done) Streaming bitrate and preferred format from settings (maxBitRate/format, so the server transcodes as configured).
(done) Playing from the Songs tab: the tapped song queues the whole songs list at that position.
(done) A queue view that lists the resolved queue, jumps to a track on tap, removes tracks and reorders them by dragging, with a one-step undo.
Adding to the queue from the library (play next / add to queue), and gapless format preferences.
Scrobbling and "now playing" back to the server.
Optional download/caching.

Phase 4 - Search, playlists, offline

Search UI over the FTS5 index (substring, ranked).
Playlist browsing and editing (create/add/remove), syncing changes back to the server.
Offline mode and downloads.

Phase 5 - Release

Change applicationId from com.subtracks.next to com.subtracks.
Signing, versioning and Fastlane metadata.
F-Droid submission. Their buildserver must have Gradle >= 9.6 and SDK 37, which this project targets; do not rely on the Gradle wrapper there (fdroidserver deletes gradlew and uses its own Gradle).

Deferred decisions

Whether to drop the plaintext-auth fallback or keep it behind an "insecure server" toggle.
Robolectric runs at SDK 35 while targetSdk is 37; aligning them changes the on-demand Roborazzi renders (nothing committed to re-record).
Whether to extract :core:data and friends once the UI has grown.

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