Per operator decision: in the playlist detail header, system
playlists (For You / Discover) now show a Regenerate button where
user playlists keep Download. Offline-download is intentionally
dropped for system playlists — operator chose the literal swap.
- Regenerate calls PlaylistsApi.refreshSystem(variant), invalidates
playlistsListProvider (home row tile rebinds to the rotated UUID),
and pushReplacement's to /playlists/<newId> so the open detail
screen rebinds instead of 404-ing on the stale id.
- Null id (empty library) and errors surface as snackbars.
- User playlists are unchanged (Download + Play).
The home-card kebab (#416, 7a04370) stays — web has refresh in both
the detail view and the home tile, so this matches web parity.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
bvandeusen
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