Include unlisted tracks in playlist responses

[rickyrombo]

Summary

• Unlisted tracks added to playlists were being filtered out by the get_tracks query's is_unlisted = false filter
• This caused a mismatch where playlist_contents listed the track ID but the hydrated tracks array was missing it
• Sets IncludeUnlisted: true for both GET /v1/playlists/:id (via ParallelParams) and GET /v1/playlists/:id/tracks

Test plan

• Fetch a playlist containing an unlisted track via GET /v1/playlists/:id and verify the track appears in the tracks array
• Fetch playlist tracks via GET /v1/playlists/:id/tracks and verify unlisted tracks are included
• Verify non-playlist track endpoints still respect the unlisted filter

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Updates playlist track hydration so unlisted tracks included in a playlist are also included in the API’s hydrated tracks arrays, eliminating mismatches between playlist_contents and tracks.

Changes:

• Include unlisted tracks when hydrating GET /v1/playlists/:id/tracks.
• Include unlisted tracks when hydrating playlists via dbv1.PlaylistsKeyed (affects GET /v1/playlists/:id and any other playlist responses that hydrate tracks via this path).
• Add IncludeUnlisted to dbv1.ParallelParams and plumb it through to track hydration in Parallel().

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
api/v1_playlist_tracks.go	Ensures playlist track listing hydration includes unlisted tracks.
api/dbv1/playlists.go	Ensures playlist hydration includes unlisted tracks when loading tracks in parallel.
api/dbv1/parallel.go	Adds/propagates IncludeUnlisted through parallel track loading.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.