Fix editability for owned YouTube Music playlists (#5187)

# What does this implement/fix?

YouTube Music library playlist objects do not include `privacy`, so
owned playlists were imported as read-only. This change uses the
playlist `owned` flag as the editability signal when available, while
retaining the existing private-playlist fallback for compatibility with
the currently pinned ytmusicapi response shape.

This depends on [ytmusicapi
#972](sigma67/ytmusicapi#972) exposing `owned`
for library playlists. It is safe to merge before that dependency is
released because responses without `owned` keep the existing behavior.

A regression test verifies that an owned playlist remains editable when
`privacy` is absent.

**Related issue (if applicable):**

- [ytmusicapi #971](sigma67/ytmusicapi#971)

## Types of changes

- [x] Bugfix (non-breaking change which fixes an issue) — `bugfix`
- [ ] New feature (non-breaking change which adds functionality) —
`new-feature`
- [ ] Enhancement to an existing feature — `enhancement`
- [ ] New music/player/metadata/plugin provider — `new-provider`
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected) — `breaking-change`
- [ ] Refactor (no behaviour change) — `refactor`
- [ ] Documentation only — `documentation`
- [ ] Maintenance / chore — `maintenance`
- [ ] CI / workflow change — `ci`
- [ ] Dependencies bump — `dependencies`

## Checklist

- [x] The code change is tested and works locally.
- [x] `pre-commit run --all-files` passes.
- [x] `pytest` passes, and tests have been added/updated under `tests/`
where applicable.
- [ ] For changes to shared models, the companion PR in
`music-assistant/models` is linked.
- [ ] For changes affecting the UI, the companion PR in
`music-assistant/frontend` is linked.
- [x] I have read and complied with the project's [AI
Policy](https://github.com/music-assistant/.github/blob/main/AI_POLICY.md)
for any AI-assisted contributions.
- [ ] I have raised a PR against the documentation repository targeting
the main or beta branch as appropriate.

Co-authored-by: Marvin Schenkel <marvinschenkel@gmail.com>

Author: seppegadeyne

music_assistant/providers/ytmusic/__init__.py

@@ -954,7 +954,7 @@ def _parse_playlist(self, playlist_obj: dict[str, Any]) -> Playlist:
         raw_playlist_id = playlist_obj["id"]
         playlist_id = raw_playlist_id
         playlist_name = playlist_obj["title"]
-        is_editable = playlist_obj.get("privacy", "") == "PRIVATE"
+        is_editable = playlist_obj.get("owned", playlist_obj.get("privacy", "") == "PRIVATE")
         # Playlist ID's are not unique across instances for lists like 'Likes', 'Supermix', etc.
         # So suffix with the instance id to make them unique
         if playlist_id in YT_PERSONAL_PLAYLISTS:

tests/providers/ytmusic/test_ytmusic.py

@@ -92,3 +92,18 @@ async def test_sync_library_keeps_other_errors_silent(provider: YoutubeMusicProv
     ):
         await provider.sync_library(MediaType.PLAYLIST)
     provider.unload_with_error.assert_not_called()
+
+
+def test_parse_owned_playlist_is_editable_without_privacy(
+    provider: YoutubeMusicProvider,
+) -> None:
+    """An owned playlist is editable even when the library response omits privacy."""
+    playlist = provider._parse_playlist(
+        {
+            "id": "PL_owned",
+            "title": "Owned playlist",
+            "owned": True,
+        }
+    )
+
+    assert playlist.is_editable is True