feat(orbit): show track attribution in host queue + host label in guest queue

Before: the guest queue already labelled guest-suggested tracks with
"Suggested by {user}", but host picks had no label — and the host's own
queue had no attribution at all. The host couldn't tell which upcoming
rows came from guests without checking the pending-approvals list.

- Guest queue: host-pick rows now show "Added by host" instead of hiding
  the attribution line.
- Host queue: each row (and the current track) shows "Added by you" or
  "Added by {user}" while an Orbit session is active. Lookup uses the
  existing OrbitState.queue / currentTrack addedBy field, so no new
  protocol fields.

New i18n keys (en+de+fr+nl+zh+nb+ru+es):
  orbit.queueAddedByHost · queueAddedByYou · queueAddedByUser

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/components/OrbitGuestQueue.tsx

@@ -169,11 +169,11 @@ export default function OrbitGuestQueue() {
                 <div className="orbit-guest-queue__track-artist">
                   {song?.artist ?? ''}
                 </div>
-                {!isHostPick && (
-                  <div className="orbit-guest-queue__submitter">
-                    {t('orbit.guestSubmitter', { user: q.addedBy })}
-                  </div>
-                )}
+                <div className="orbit-guest-queue__submitter">
+                  {isHostPick
+                    ? t('orbit.queueAddedByHost')
+                    : t('orbit.guestSubmitter', { user: q.addedBy })}
+                </div>
               </div>
             </div>
           );

src/components/QueuePanel.tsx

@@ -251,6 +251,28 @@ function QueuePanelHostOrSolo() {
   const navigate = useNavigate();
   const orbitRole = useOrbitStore(s => s.role);
   const orbitState = useOrbitStore(s => s.state);
+  /** trackId → addedBy (host username or guest username) — only populated while
+   *  hosting an Orbit session, so the queue rows can surface attribution. */
+  const orbitAddedByByTrack = useMemo(() => {
+    const map = new Map<string, string>();
+    if (orbitRole !== 'host' || !orbitState) return map;
+    if (orbitState.currentTrack) {
+      map.set(orbitState.currentTrack.trackId, orbitState.currentTrack.addedBy);
+    }
+    for (const q of orbitState.queue) map.set(q.trackId, q.addedBy);
+    return map;
+  }, [orbitRole, orbitState]);
+  const orbitHostUsername = orbitState?.host ?? '';
+  /** Attribution label for a queue row / current track while hosting. Null when
+   *  not hosting, when the track isn't part of the Orbit state, or when it
+   *  isn't relevant for this user (non-host and we haven't mapped the added-by). */
+  const orbitAttributionLabel = (trackId: string): string | null => {
+    if (orbitRole !== 'host') return null;
+    const addedBy = orbitAddedByByTrack.get(trackId);
+    if (!addedBy) return null;
+    if (addedBy === orbitHostUsername) return t('orbit.queueAddedByYou');
+    return t('orbit.queueAddedByUser', { user: addedBy });
+  };
   const queue = usePlayerStore(s => s.queue);
   const queueIndex = usePlayerStore(s => s.queueIndex);
   const currentTrack = usePlayerStore(s => s.currentTrack);
@@ -571,6 +593,10 @@ function QueuePanelHostOrSolo() {
               {currentTrack.year && (
                 <div className="queue-current-sub">{currentTrack.year}</div>
               )}
+              {(() => {
+                const label = orbitAttributionLabel(currentTrack.id);
+                return label ? <div className="queue-current-sub queue-current-attribution">{label}</div> : null;
+              })()}
               {renderStars(userRatingOverrides[currentTrack.id] ?? currentTrack.userRating)}
             </div>
           </div>
@@ -748,6 +774,10 @@ function QueuePanelHostOrSolo() {
                     <span className="truncate">{track.title}</span>
                   </div>
                   <div className="queue-item-artist truncate">{track.artist}</div>
+                  {(() => {
+                    const label = orbitAttributionLabel(track.id);
+                    return label ? <div className="queue-item-attribution truncate">{label}</div> : null;
+                  })()}
                 </div>
                 <div className="queue-item-duration">
                   {formatTime(track.duration)}

src/locales/de.ts

@@ -1650,6 +1650,9 @@ export const deTranslation = {
     approvalDecline: 'Ablehnen',
     guestUpNextMore: '+ {{count}} weitere in der Host-Warteschlange',
     guestSubmitter: 'von {{user}}',
+    queueAddedByHost: 'Vom Host hinzugefügt',
+    queueAddedByYou: 'Von dir hinzugefügt',
+    queueAddedByUser: 'Hinzugefügt von {{user}}',
     guestEmpty: 'Noch keine Vorschläge. Öffne bei einem Song das Kontextmenü und wähle „Zur Orbit-Session hinzufügen".',
     guestFooter: 'Die Wiedergabe wird vom Gastgeber gesteuert — du kannst die Liste nicht ändern.',
     exitKickedTitle: 'Du wurdest aus der Session gebannt',

src/locales/en.ts

@@ -1654,6 +1654,9 @@ export const enTranslation = {
     approvalDecline: 'Decline',
     guestUpNextMore: '+ {{count}} more in the host\'s queue',
     guestSubmitter: 'by {{user}}',
+    queueAddedByHost: 'Added by host',
+    queueAddedByYou: 'Added by you',
+    queueAddedByUser: 'Added by {{user}}',
     guestEmpty: 'No suggestions yet. Open a track\'s context menu and pick "Add to Orbit session".',
     guestFooter: "The host controls playback — you can't change the list.",
     exitKickedTitle: 'You were banned from the session',

src/locales/es.ts

@@ -1637,6 +1637,9 @@ export const esTranslation = {
     approvalDecline: 'Rechazar',
     guestUpNextMore: '+ {{count}} más en la cola del anfitrión',
     guestSubmitter: 'de {{user}}',
+    queueAddedByHost: 'Añadido por el anfitrión',
+    queueAddedByYou: 'Añadido por ti',
+    queueAddedByUser: 'Añadido por {{user}}',
     guestEmpty: 'Aún no hay sugerencias. Abre el menú contextual de una canción y elige "Añadir a la sesión Orbit".',
     guestFooter: 'El anfitrión controla la reproducción — no puedes cambiar la lista.',
     exitKickedTitle: 'Has sido baneado de la sesión',

src/locales/fr.ts

@@ -1632,6 +1632,9 @@ export const frTranslation = {
     approvalDecline: 'Refuser',
     guestUpNextMore: '+ {{count}} autres dans la file de l\'hôte',
     guestSubmitter: 'par {{user}}',
+    queueAddedByHost: 'Ajouté par l\'hôte',
+    queueAddedByYou: 'Ajouté par toi',
+    queueAddedByUser: 'Ajouté par {{user}}',
     guestEmpty: 'Aucune suggestion. Ouvre le menu contextuel d\'un morceau et choisis « Ajouter à la session Orbit ».',
     guestFooter: 'L\'hôte contrôle la lecture — tu ne peux pas modifier la liste.',
     exitKickedTitle: 'Tu as été banni de la session',

src/locales/nb.ts

@@ -1631,6 +1631,9 @@ export const nbTranslation = {
     approvalDecline: 'Avvis',
     guestUpNextMore: '+ {{count}} flere i vertens kø',
     guestSubmitter: 'av {{user}}',
+    queueAddedByHost: 'Lagt til av verten',
+    queueAddedByYou: 'Lagt til av deg',
+    queueAddedByUser: 'Lagt til av {{user}}',
     guestEmpty: 'Ingen forslag ennå. Åpne et spors kontekstmeny og velg "Legg til i Orbit-økt".',
     guestFooter: 'Verten kontrollerer avspillingen — du kan ikke endre listen.',
     exitKickedTitle: 'Du ble utestengt fra økten',

src/locales/nl.ts

@@ -1631,6 +1631,9 @@ export const nlTranslation = {
     approvalDecline: 'Weigeren',
     guestUpNextMore: '+ {{count}} meer in de wachtrij van de host',
     guestSubmitter: 'door {{user}}',
+    queueAddedByHost: 'Toegevoegd door host',
+    queueAddedByYou: 'Toegevoegd door jou',
+    queueAddedByUser: 'Toegevoegd door {{user}}',
     guestEmpty: 'Nog geen suggesties. Open het contextmenu van een nummer en kies "Aan Orbit-sessie toevoegen".',
     guestFooter: 'De host bedient de weergave — je kunt de lijst niet wijzigen.',
     exitKickedTitle: 'Je bent uit de sessie gebannen',

src/locales/ru.ts

@@ -1713,6 +1713,9 @@ export const ruTranslation = {
     approvalDecline: 'Отклонить',
     guestUpNextMore: '+ ещё {{count}} в очереди хоста',
     guestSubmitter: 'от {{user}}',
+    queueAddedByHost: 'Добавил хост',
+    queueAddedByYou: 'Добавил(а) ты',
+    queueAddedByUser: 'Добавил {{user}}',
     guestEmpty: 'Предложений пока нет. Открой контекстное меню трека и выбери «Добавить в сессию Orbit».',
     guestFooter: 'Хост управляет воспроизведением — ты не можешь изменять список.',
     exitKickedTitle: 'Тебя забанили в сессии',

src/locales/zh.ts

@@ -1624,6 +1624,9 @@ export const zhTranslation = {
     approvalDecline: '拒绝',
     guestUpNextMore: '+ 主持人队列中还有 {{count}} 首',
     guestSubmitter: '来自 {{user}}',
+    queueAddedByHost: '由主持人添加',
+    queueAddedByYou: '由你添加',
+    queueAddedByUser: '由 {{user}} 添加',
     guestEmpty: '还没有建议。打开曲目的上下文菜单并选择"添加到 Orbit 会话"。',
     guestFooter: '主持人控制播放 — 你无法更改列表。',
     exitKickedTitle: '你已被会话封禁',

src/styles/layout.css

@@ -2160,6 +2160,26 @@ html[data-platform="windows"] .player-bar.floating {
   opacity: 0.8;
 }
 
+.queue-item-attribution,
+.queue-current-attribution {
+  font-size: 10px;
+  color: var(--text-muted);
+  opacity: 0.75;
+  margin-top: 1px;
+  font-style: italic;
+}
+
+.queue-item:hover .queue-item-attribution,
+.queue-item.context-active .queue-item-attribution {
+  color: var(--text-secondary);
+  opacity: 0.9;
+}
+
+.queue-item.active .queue-item-attribution {
+  color: inherit;
+  opacity: 0.7;
+}
+
 /* ═══════════════════════════════════════════════════════════════════════════
    MOBILE LAYOUT  (< 800px)
    Controller: data-mobile attribute set by useIsMobile hook