The original design used negative i64 ids to distinguish ephemeral
tracks from DB rows, but the queue and playback-context commands
serialize ids as Vec<u64> end-to-end (V2QueueTrack, v2_set_playback_context).
serde rejects negative numbers at the boundary, so setQueueForLocalTracks
and setPlaybackContext failed the moment the user clicked an ephemeral
track:
invalid value: integer `-1`, expected u64
Switch synthetic ids to a high-positive range (EPHEMERAL_ID_FLOOR =
1<<48) instead. Pros over the negative scheme:
* Valid u64 — passes through the queue/context commands untouched
* Below 2^53 so JS Number round-trips without precision loss
* Far above any realistic DB autoincrement id, so the discrimination
test (`track_id >= EPHEMERAL_ID_FLOOR`) stays unambiguous
Also fixes the snake_case mismatch on EphemeralFolderState — the Rust
struct serializes with its native field names (folder_path,
skipped_files), but the TypeScript type was declared in camelCase, so
ephemeralFolder.folderPath was undefined at render time.
cc
vicrodh
9c745e595c