* feat(v3): add "Add to playlist" to a song's ⋮ More menu
You could only add a song to a playlist via select-mode (checkbox → batch bar).
Add an "Add to playlist" row to each song card's ⋮ overflow menu that targets
that one song, reusing the same picker (pick a listed number or type a new name
to create the playlist).
The select-mode batch flow and the single-song menu now share one extracted
`addFilenamesToPlaylist(filenames)` helper; the menu is `openCardMenu`, shared by
grid cards and tree rows, so both views get it. Tests:
tests/js/v3_add_to_playlist_menu.test.js.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QbexxfTt8q2tAn436MqGWF
* fix(v3): don't clear the batch selection when the playlist picker is cancelled
The extract-helper refactor made batchAddToPlaylist() call finishBatch()
unconditionally, so cancelling (or a failed create) cleared the multi-select
and reloaded the grid — a regression from the original early-return-on-cancel
behaviour. addFilenamesToPlaylist() already returns null on cancel/failure;
gate finishBatch() on a truthy playlist id so the selection is preserved for
a retry. Adds a regression assertion.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
Co-authored-by: byrongamatos <xasiklas@gmail.com>
