feat(voice): playback-speed toggle (1x/1.5x/2x) with per-user default

apps/desktop/src/components/AttachmentAudio.tsx

@@ -2,6 +2,7 @@ import { type AttachmentHandle, downloadAndDecryptAttachment } from '@chat-app/s
 import { useEffect, useMemo, useRef, useState } from 'react';
 
 import { getCachedAttachment, putCachedAttachment } from '../lib/attachmentCache';
+import { getVoiceSpeed, setVoiceSpeed, VOICE_SPEEDS, type VoiceSpeed } from '../lib/voiceSpeedSettings';
 import { supabase } from '../lib/supabase';
 import { AlertIcon, MicIcon, SpinnerIcon } from './icons';
 
@@ -23,6 +24,7 @@ export function AttachmentAudio({ handle }: Props) {
   const [duration, setDuration] = useState<number>(0);
   const [position, setPosition] = useState<number>(0);
   const [playing, setPlaying] = useState(false);
+  const [speed, setSpeed] = useState<VoiceSpeed>(() => getVoiceSpeed());
   const audioRef = useRef<HTMLAudioElement | null>(null);
 
   useEffect(() => {
@@ -105,6 +107,12 @@ export function AttachmentAudio({ handle }: Props) {
     };
   }, [arrayBuf]);
 
+  useEffect(() => {
+    const el = audioRef.current;
+    if (!el) return;
+    el.playbackRate = speed;
+  }, [speed, blobUrl]);
+
   const fallbackPeaks = useMemo(
     () => (peaks ? null : Array.from({ length: BAR_COUNT }, () => 0.5)),
     [peaks],
@@ -154,6 +162,29 @@ export function AttachmentAudio({ handle }: Props) {
           <PlayGlyph />
         )}
       </button>
+      <div className="flex shrink-0 items-center gap-0.5 rounded-md bg-surface-3 p-0.5 text-[10px] font-semibold text-fg-muted">
+        {VOICE_SPEEDS.map((s) => {
+          const active = s === speed;
+          return (
+            <button
+              key={s}
+              type="button"
+              onClick={() => {
+                setSpeed(s);
+                setVoiceSpeed(s);
+              }}
+              className={
+                'flex h-6 w-7 cursor-pointer items-center justify-center rounded transition ' +
+                (active ? 'bg-accent text-accent-fg' : 'hover:bg-surface hover:text-fg')
+              }
+              aria-pressed={active}
+              title={'Wiedergabegeschwindigkeit ' + s + '×'}
+            >
+              {s}×
+            </button>
+          );
+        })}
+      </div>
       <div className="flex min-w-0 flex-1 flex-col gap-1">
         <div
           role="slider"

apps/desktop/src/lib/voiceSpeedSettings.ts

@@ -0,0 +1,29 @@
+// Persists the preferred voice-message playback rate across sessions.
+// localStorage is fine here — non-sensitive, single source of truth per
+// device, no cross-device sync needed.
+
+const KEY = 'chatapp:voice-speed';
+const ALLOWED = [1, 1.5, 2] as const;
+export type VoiceSpeed = (typeof ALLOWED)[number];
+
+export function getVoiceSpeed(): VoiceSpeed {
+  try {
+    const raw = window.localStorage.getItem(KEY);
+    if (!raw) return 1;
+    const parsed = Number(raw);
+    if (ALLOWED.includes(parsed as VoiceSpeed)) return parsed as VoiceSpeed;
+  } catch {
+    /* localStorage unavailable */
+  }
+  return 1;
+}
+
+export function setVoiceSpeed(speed: VoiceSpeed): void {
+  try {
+    window.localStorage.setItem(KEY, String(speed));
+  } catch {
+    /* localStorage unavailable — best effort */
+  }
+}
+
+export const VOICE_SPEEDS = ALLOWED;