refactor: split ui/ui.js into 5 focused modules
settings.js — settings modal, romaji overrides, sidebar, theme, nav mode
modals.js — context menu, playlist-add modal, confirm dialog, edit-playlist modal
metadata.js — song info/edit modal, MusicBrainz/iTunes autofill, saveMetadata, deleteSong
notify.js — notification panel, bell badge, _addNotif, _notifNavigate
downloads.js — download modal, Spotify download, jobs panel, startArtistSortFix
ui.js — barrel re-export; all external imports unchanged
player.js left unsplit: shared private state (_nativePlaying, _playGen, _queueGen, etc.)
spans every section — splitting would require exporting internal state.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
HoneyandClaude Sonnet 4.6
0663b1c923