feat(queue): switchable queue display mode (Queue vs Playlist) (#922)

* feat(queue): add queueDisplayMode setting with rehydrate (default queue)

* feat(queue): render upcoming-only or full timeline by mode, with header toggle

* feat(settings): add queue display mode toggle to Personalisation

* i18n: queue display mode strings across all locales

* test(queue): display-mode rendering and absolute index mapping

* docs: changelog + credits for queue display mode (#922)

src/locales/ro/queue.ts

@@ -1,5 +1,7 @@
 export const queue = {
   title: 'Coadă',
+  modePlaylist: 'Playlist',
+  noUpcoming: 'Nicio piesă în continuare.',
   savePlaylist: 'Salvează Playlist',
   updatePlaylist: 'Actualizează Playlist',
   filterPlaylists: 'Filtrează playlisturi…',