New local_playlists + local_playlist_tracks schema in the shared per-user
library.db (ids 'local:<uuid>', sources qobuz/local/plex, position-compacted,
8 repo tests in qbz-library). PlaylistRef routing at the navigation seam
makes local ids unrepresentable in Qobuz playlist calls by construction
(all take u64). Local playlists appear in sidebar, manager and picker
(picker hides the Qobuz set while offline); detail view reuses the existing
playlist row machinery and renders offline; creation modal gains the
offline-only toggle (forced on while offline - creating offline always
produces a local playlist, D8) and Edit can flip it later; explicit
Upload-to-Qobuz conversion for non-offline-only locals (confirm dialog,
local rows attach via the existing sidecar, entity kept on failure).
Never-to-Qobuz guard: queues built from an offline-only playlist carry a
core-level stamp cleared by every queue replacement; the QConnect sync
skips the cloud push and play-on-peer falls back to local playback while
the stamp is set.
Deferred (logged in the slice report): plex-row attach on upload, custom
reorder for local playlists, folder/favorite/hide on local items, manager
sort interleaving, offline cover thumbs for cached qobuz rows.
cc