Click on the For-You tile's play button now triggers a synchronous
refresh, then enqueues + auto-plays the freshly-built playlist.
Two-click-target tile pattern: tile BODY click still navigates to
the playlist detail page (existing behavior); the play button is
the new generate-and-play action.
Behavior is gated on playlist.system_variant === 'for_you' — every
other playlist (user, Discover, Songs-like-X) keeps the existing
"fetch detail, enqueue, play" flow. The atomic-replace BuildSystem-
Playlists creates a new playlist_id, so the play handler uses the
refresh response's id for the follow-up getPlaylist call rather
than the stale tile prop's id.
Empty-library response (playlist_id: null) is a no-op — clicking
play in a degenerate-empty library doesn't error, it just doesn't
start playback. Caches are invalidated post-refresh so the home
view re-fetches and the tile re-renders with the new id, avoiding
the corner case of a click-then-tile-body 404.
Tests cover the refresh-and-play happy path, the empty-library
no-op, and that non-For-You playlists keep the existing flow.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
bvandeusen
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