Tapping Instant Mix on Plex often did nothing: the /playQueues POST used no
endpoint failover, createPlayQueue swallowed every error into null,
fetchInstantMix mapped that to an empty list, playInstantMix returned
silently on empty tracks, and the errors stream's only listener is the
now-playing screen, which is not mounted at tap time (#2141).
The play-queue POST now rides the shared endpoint failover (replaying it is
safe: an orphaned duplicate queue on the server is inert), createPlayQueue
and fetchInstantMix propagate typed errors, playInstantMix reports
started/empty/superseded and throws fetch failures, and the tap site shows
a translated snackbar for a failed or empty mix. A failed collection or
playlist queue launch now also reaches the real failure snackbar instead of
the misleading "no items" path.
plex_client.selectStreams' allParts=false branch, download_manager's both-branches-true conditional and unscoped getAllPinnedMetadata tail, playback_source_resolver.preferOffline, and update_service's unreachable catches had no reachable path; PlaybackSession.result/streamHeaders, PlaybackContext.clientScopeId, FileInfoStreams.audioStream, PrefsRepairOutcome.settingsReset/sessionsSalvaged, and JellyfinLiveSessionTracker.playSessionId were write-only; PlexConnection.directUrl, PlexServer.isOnline plus its parse-and-persist presence field, SafStorageService.createDirectory, FullscreenStateManager.stopMonitoring/dispose, the play_queue_launcher re-export shim, track-selection's constant params, and PlexApiCache.unpinForOffline/isPinnedRatingKey (matching the earlier Jellyfin removal) were dead API.
Introduces shared seams for paginated views, D-pad reorder, media control
routing, async singletons and the device method channel, then points the
open-coded copies at them.
Also removes unused models and duplicated provider/server plumbing, folds
the twice-implemented artifact store in the server, and factors the
repeated Flutter toolchain prologue in CI into a composite action.
Drops dead code across services, models, utils and widgets, including the
connection auth service, which had no implementer, and the Live TV DVR
provisioning models, which had no caller.
Tests that only covered deleted behaviour are removed or trimmed. No
behaviour change.
edde746