Adds the 'Align playlists' action to the out-of-order modal — a dedicated,
order-only write path that does NOT touch the normal sync. Subsonic has no
per-track move, so it overwrites the song list in source order via createPlaylist
+ playlistId (same primitive replace-mode uses; identity/id preserved).
- plan_align_rewrite() (pure, tested): matched server ids in source order; every
one must already be in the playlist (never injects a track); extras either
dropped ('Mirror source') or parked at the end ('Keep extras'); returns None on
stale data so a vanished track can't be written.
- navidrome rewrite_playlist_order() primitive (raw ordered ids).
- /api/server/playlist/<id>/align: validates ids are in the live playlist, then
rewrites. Navidrome-only for now (Plex/Jellyfin reorder = follow-up).
- modal gets two explained options; missing tracks are NOT added (normal sync's
job) and that's stated. Metadata-free by design — it only reshuffles existing
server ids, so there's no sync-parity surface.
Open: confirm createPlaylist+playlistId preserves the playlist comment/image on a
live Navidrome (same risk as replace mode); add a re-apply step if it doesn't.
606d1f951d