voice: add global playback speed control for audio and voice

docs/core-checklist-status.md

@@ -23,7 +23,7 @@ Legend:
 14. Delivery Status - `DONE` (sent/delivered/read + reconnect reconciliation after backend restarts)
 15. Typing Realtime - `PARTIAL` (typing start/stop done; voice/video typing signals limited)
 16. Media & Attachments - `DONE` (upload/preview/download/gallery)
-17. Voice Messages - `PARTIAL` (record/send/play/seek/speed; UX still being polished)
+17. Voice Messages - `PARTIAL` (record/send/play/seek + global speed 1x/1.5x/2x; UX still being polished)
 18. Circle Video Messages - `PARTIAL` (send/play present, recording UX basic)
 19. Stickers - `PARTIAL` (web sticker picker with preset pack + favorites)
 20. GIF - `PARTIAL` (web GIF picker with Tenor search + preset fallback + favorites)

web/src/components/MessageList.tsx

@@ -1340,6 +1340,8 @@ function AudioInlinePlayer({ src, title }: { src: string; title: string }) {
   const playTrack = useAudioPlayerStore((s) => s.playTrack);
   const togglePlayGlobal = useAudioPlayerStore((s) => s.togglePlay);
   const seekToGlobal = useAudioPlayerStore((s) => s.seekTo);
+  const playbackRate = useAudioPlayerStore((s) => s.playbackRate);
+  const cyclePlaybackRate = useAudioPlayerStore((s) => s.cyclePlaybackRate);
 
   const isActiveTrack = track?.src === src;
   const isPlaying = isActiveTrack && isPlayingGlobal;
@@ -1391,6 +1393,13 @@ function AudioInlinePlayer({ src, title }: { src: string; title: string }) {
         <span className="inline-flex h-6 min-w-6 items-center justify-center rounded-full bg-slate-800 px-1 text-[10px] text-slate-300">
           ♪
         </span>
+        <button
+          className="inline-flex h-6 min-w-8 items-center justify-center rounded-full bg-slate-800 px-1 text-[10px] text-slate-300 hover:bg-slate-700"
+          onClick={() => cyclePlaybackRate()}
+          type="button"
+        >
+          {playbackRate}x
+        </button>
       </div>
     </div>
   );
@@ -1412,6 +1421,8 @@ function VoiceInlinePlayer({
   const playTrack = useAudioPlayerStore((s) => s.playTrack);
   const togglePlayGlobal = useAudioPlayerStore((s) => s.togglePlay);
   const seekToGlobal = useAudioPlayerStore((s) => s.seekTo);
+  const playbackRate = useAudioPlayerStore((s) => s.playbackRate);
+  const cyclePlaybackRate = useAudioPlayerStore((s) => s.cyclePlaybackRate);
 
   const isActiveTrack = track?.src === src;
   const isPlaying = isActiveTrack && isPlayingGlobal;
@@ -1461,6 +1472,13 @@ function VoiceInlinePlayer({
       <span className="w-10 text-right text-[11px] tabular-nums text-slate-200">
         {formatAudioTime(duration > 0 ? duration : position)}
       </span>
+      <button
+        className="inline-flex h-6 min-w-8 items-center justify-center rounded-full bg-slate-800 px-1 text-[10px] text-slate-300 hover:bg-slate-700"
+        onClick={() => cyclePlaybackRate()}
+        type="button"
+      >
+        {playbackRate}x
+      </button>
     </div>
   );
 }

web/src/store/audioPlayerStore.ts

@@ -10,6 +10,7 @@ interface AudioPlayerState {
   audioEl: HTMLAudioElement | null;
   isPlaying: boolean;
   volume: number;
+  playbackRate: number;
   duration: number;
   position: number;
   playTrack: (track: ActiveTrack) => Promise<void>;
@@ -17,11 +18,25 @@ interface AudioPlayerState {
   seekTo: (seconds: number) => void;
   seekBy: (secondsDelta: number) => void;
   setVolume: (volume: number) => void;
+  setPlaybackRate: (rate: number) => void;
+  cyclePlaybackRate: () => void;
   stop: () => void;
 }
 
 let globalAudioEl: HTMLAudioElement | null = null;
 let isBound = false;
+const PLAYBACK_RATE_KEY = "bm_audio_playback_rate";
+
+function getInitialPlaybackRate(): number {
+  if (typeof window === "undefined") {
+    return 1;
+  }
+  const raw = Number(window.localStorage.getItem(PLAYBACK_RATE_KEY) || "1");
+  if (raw === 1 || raw === 1.5 || raw === 2) {
+    return raw;
+  }
+  return 1;
+}
 
 function ensureAudio(): HTMLAudioElement {
   if (globalAudioEl) {
@@ -37,6 +52,7 @@ export const useAudioPlayerStore = create<AudioPlayerState>((set, get) => ({
   audioEl: ensureAudio(),
   isPlaying: false,
   volume: 1,
+  playbackRate: getInitialPlaybackRate(),
   duration: 0,
   position: 0,
   playTrack: async (track) => {
@@ -63,6 +79,7 @@ export const useAudioPlayerStore = create<AudioPlayerState>((set, get) => ({
       set({ track });
     }
     audio.volume = get().volume;
+    audio.playbackRate = get().playbackRate;
     try {
       await audio.play();
       set({ isPlaying: true, audioEl: audio });
@@ -111,6 +128,20 @@ export const useAudioPlayerStore = create<AudioPlayerState>((set, get) => ({
     audio.volume = normalized;
     set({ volume: normalized });
   },
+  setPlaybackRate: (rate) => {
+    const normalized = rate === 2 ? 2 : rate === 1.5 ? 1.5 : 1;
+    const audio = ensureAudio();
+    audio.playbackRate = normalized;
+    if (typeof window !== "undefined") {
+      window.localStorage.setItem(PLAYBACK_RATE_KEY, String(normalized));
+    }
+    set({ playbackRate: normalized });
+  },
+  cyclePlaybackRate: () => {
+    const current = get().playbackRate;
+    const next = current === 1 ? 1.5 : current === 1.5 ? 2 : 1;
+    get().setPlaybackRate(next);
+  },
   stop: () => {
     const audio = ensureAudio();
     if (audio) {