Connection.status was write-only health state (only the Jellyfin refresh wrote it, nothing read it — MultiServerManager owns real server status), ConnectionKind duplicated MediaBackend line for line, the token-to-PlexAccountConnection pipeline existed three times (sign-in, dev-token seed, legacy migration) with drifting label/dedup policy, and JellyfinConnectionAuthService.validate/refresh/signOut had no production callers.
Connection.kind is now MediaBackend (persisted 'plex'/'jellyfin'/'emby' strings are identical, no migration); buildPlexAccountConnection in plex_account_setup.dart owns identity resolution with the three callers keeping only their genuine deltas; the test-only auth trio and its jellyfinSignOut timeout constant are gone.
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.
edde746