Adds an "Open Folder" button in the LocalLibrary > Folders tree toolbar
that lets the user point QBZ at any folder on disk and play it without
adding anything to local_tracks. Lets the app act as an ad-hoc media
player for downloaded albums, external drives, etc.
Backend:
- New ephemeral_library module: in-memory HashMap<i64, LocalTrack> keyed
by synthetic negative ids. Reuses LibraryScanner and MetadataExtractor
to walk the folder and build LocalTrack records.
- Three V2 commands: v2_ephemeral_open_folder (scan + populate, replaces
any prior session), v2_ephemeral_clear, v2_ephemeral_get_track.
- v2_library_play_track gets a small branch at the top: track_id < 0
resolves through the ephemeral state and goes straight to the regular
local-file playback path (read file, hand to player). DB-backed paths
(Qobuz cache, CUE start positions) are skipped — ephemeral tracks
can't be any of those.
Frontend:
- "Open Folder" button (FolderOpen icon) next to the collapse-all button
in the tree toolbar. Click opens the OS file picker, the result lands
in a new ephemeralFolder $state.
- Right pane gets a new branch above the existing album/folder views:
when ephemeralFolder is set, render a dedicated pane with header
(folder name, path, track count, Play All, Close) and a flat track
list with play-on-click rows.
- Lifecycle per spec: a session survives until (1) a different album or
tree folder is selected — handled via $effect that watches
selectedAlbum and selectedFolderPath, (2) the user clicks the Close
button, or (3) the backend reports the file/directory is gone (caught
in the play handler and folded into the same close path).
- Translations for en, es, de, fr, pt.
Notes:
- The audio_cache key is `track_id as u64`, which for negative ids wraps
to a large u64 value — unique and safe (DB ids are positive).
- Edit-metadata gating for ephemeral tracks is deferred: there is no
edit trigger from the new pane yet, so the sidecar/direct toggle
behaviour is unchanged. Will gate when an edit path lands.
cc
vicrodh
aa015829aa