fix(host-control-mode): harden gates, close UX races, debounce toggles, surface desync state

Bis auf peerId-Auth (akzeptiert) alle Audit-Findings behoben:
- Snap-back spielt nicht mehr blind ab, wenn Host-Status unbekannt
- Teardown-Pfade broadcasten jetzt CONTROL_MODE → kein verwaistes Badge/Dialog
- Dialog-Timer bei Ersetzung sauber gecleart
- Server re-synchronisiert Sender bei nicht-Host-Reject
- Popup-Toggle revertiert bei Server-Ablehnung
- Desync-Zweig sendet keine Phantom-ACKs mehr an Host
- Toggle-Debouncing serverseitig (500ms pro Raum)
- Button-Text auf Unlock zurückgesetzt
- Live-Erkennung defensiver, Resync-Retry bei fehlendem Target, Badge-Retry

Neu: Host sieht 'Solo'-Badge für desyncte Gäste via PEER_STATUS-Heartbeat
(16 Sprachen, neuer i18n-Key BADGE_DESYNCED/TOOLTIP_PEER_DESYNCED)

Tests: H-5-Reject-Unicast, M-4-Debounce, Desync-Heartbeat-Relay

extension/locales/de.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "Der Host steuert die Wiedergabe für alle.",
   "BADGE_HOST": "Host",
   "BADGE_GUEST": "Gast",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Schaut alleine — ignoriert die Befehle des Hosts",
   "NO_PEERS_CONNECTED": "Keine Teilnehmer verbunden",
   "BTN_LEAVE_ROOM": "Raum verlassen",
   "LABEL_SELECT_VIDEO": "Video auswählen",

extension/locales/en.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "The host controls playback for everyone.",
   "BADGE_HOST": "Host",
   "BADGE_GUEST": "Guest",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Watching on their own — host's commands are ignored",
   "NO_PEERS_CONNECTED": "No peers connected",
   "BTN_LEAVE_ROOM": "Leave Room",
   "LABEL_SELECT_VIDEO": "Select Video",

extension/locales/es.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "El anfitrión controla la reproducción para todos.",
   "BADGE_HOST": "Anfitrión",
   "BADGE_GUEST": "Invitado",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Viendo por su cuenta — ignora los comandos del anfitrión",
   "NO_PEERS_CONNECTED": "Sin participantes conectados",
   "BTN_LEAVE_ROOM": "Salir de la sala",
   "LABEL_SELECT_VIDEO": "Seleccionar video",

extension/locales/fr.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "L'hôte contrôle la lecture pour tout le monde.",
   "BADGE_HOST": "Hôte",
   "BADGE_GUEST": "Invité",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Regarde de son côté — ignore les commandes de l'hôte",
   "NO_PEERS_CONNECTED": "Aucun membre connecté",
   "BTN_LEAVE_ROOM": "Quitter le salon",
   "LABEL_SELECT_VIDEO": "Choisir une vidéo",

extension/locales/it.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "L'host controlla la riproduzione per tutti.",
   "BADGE_HOST": "Host",
   "BADGE_GUEST": "Ospite",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Guarda per conto proprio — ignora i comandi dell'host",
   "NO_PEERS_CONNECTED": "Nessun partecipante connesso",
   "BTN_LEAVE_ROOM": "Lascia Stanza",
   "LABEL_SELECT_VIDEO": "Seleziona Video",

extension/locales/ja.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "ホストが全員の再生を操作します。",
   "BADGE_HOST": "ホスト",
   "BADGE_GUEST": "ゲスト",
+  "BADGE_DESYNCED": "ソロ",
+  "TOOLTIP_PEER_DESYNCED": "単独で視聴中 — ホストのコマンドを無視しています",
   "NO_PEERS_CONNECTED": "接続しているメンバーはいません",
   "BTN_LEAVE_ROOM": "ルームを退室",
   "LABEL_SELECT_VIDEO": "ビデオを選択",

extension/locales/ko.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "호스트가 모두의 재생을 제어합니다.",
   "BADGE_HOST": "호스트",
   "BADGE_GUEST": "게스트",
+  "BADGE_DESYNCED": "단독",
+  "TOOLTIP_PEER_DESYNCED": "혼자 시청 중 — 호스트 명령을 무시합니다",
   "NO_PEERS_CONNECTED": "연결된 참여자가 없습니다",
   "BTN_LEAVE_ROOM": "방 나가기",
   "LABEL_SELECT_VIDEO": "비디오 선택",

extension/locales/nl.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "De host bedient de weergave voor iedereen.",
   "BADGE_HOST": "Host",
   "BADGE_GUEST": "Gast",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Zelfstandig aan het kijken — negeert de commando's van de host",
   "NO_PEERS_CONNECTED": "Geen deelnemers verbonden",
   "BTN_LEAVE_ROOM": "Kamer verlaten",
   "LABEL_SELECT_VIDEO": "Selecteer video",

extension/locales/pl.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "Host steruje odtwarzaniem dla wszystkich.",
   "BADGE_HOST": "Host",
   "BADGE_GUEST": "Gość",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Ogląda samodzielnie — ignoruje polecenia hosta",
   "NO_PEERS_CONNECTED": "Brak połączonych uczestników",
   "BTN_LEAVE_ROOM": "Opuść pokój",
   "LABEL_SELECT_VIDEO": "Wybierz wideo",

extension/locales/pt-BR.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "O anfitrião controla a reprodução para todos.",
   "BADGE_HOST": "Anfitrião",
   "BADGE_GUEST": "Convidado",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Assistindo por conta própria — ignora os comandos do anfitrião",
   "NO_PEERS_CONNECTED": "Sem participantes conectados",
   "BTN_LEAVE_ROOM": "Sair da sala",
   "LABEL_SELECT_VIDEO": "Selecionar vídeo",

extension/locales/pt.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "O anfitrião controla a reprodução para todos.",
   "BADGE_HOST": "Anfitrião",
   "BADGE_GUEST": "Convidado",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "A ver por conta própria — ignora os comandos do anfitrião",
   "NO_PEERS_CONNECTED": "Nenhum participante ligado",
   "BTN_LEAVE_ROOM": "Sair da Sala",
   "LABEL_SELECT_VIDEO": "Selecionar Vídeo",

extension/locales/ru.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "Ведущий управляет воспроизведением для всех.",
   "BADGE_HOST": "Ведущий",
   "BADGE_GUEST": "Гость",
+  "BADGE_DESYNCED": "Соло",
+  "TOOLTIP_PEER_DESYNCED": "Смотрит отдельно — игнорирует команды ведущего",
   "NO_PEERS_CONNECTED": "Нет подключенных участников",
   "BTN_LEAVE_ROOM": "Выйти из комнаты",
   "LABEL_SELECT_VIDEO": "Выбрать видео",

extension/locales/tr.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "Oynatmayı herkes için sunucu kontrol eder.",
   "BADGE_HOST": "Sunucu",
   "BADGE_GUEST": "Misafir",
+  "BADGE_DESYNCED": "Solo",
+  "TOOLTIP_PEER_DESYNCED": "Tek başına izliyor — sunucu komutlarını yok sayar",
   "NO_PEERS_CONNECTED": "Bağlı kimse yok",
   "BTN_LEAVE_ROOM": "Odadan Ayrıl",
   "LABEL_SELECT_VIDEO": "Video Seç",

extension/locales/uk.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "Ведучий керує відтворенням для всіх.",
   "BADGE_HOST": "Ведучий",
   "BADGE_GUEST": "Гість",
+  "BADGE_DESYNCED": "Соло",
+  "TOOLTIP_PEER_DESYNCED": "Дивиться окремо — ігнорує команди ведучого",
   "NO_PEERS_CONNECTED": "Немає підключених однорангових пристроїв",
   "BTN_LEAVE_ROOM": "Вийти з кімнати",
   "LABEL_SELECT_VIDEO": "Виберіть Відео",

extension/locales/zh.json

@@ -50,6 +50,8 @@
   "NOTICE_HOST_CONTROLS": "由主持人为所有人控制播放。",
   "BADGE_HOST": "主持人",
   "BADGE_GUEST": "访客",
+  "BADGE_DESYNCED": "单独",
+  "TOOLTIP_PEER_DESYNCED": "单独观看中 — 忽略主持人的命令",
   "NO_PEERS_CONNECTED": "没有对等点连接",
   "BTN_LEAVE_ROOM": "离开房间",
   "LABEL_SELECT_VIDEO": "选择视频",