zebra-report: deploy audioCtx sinkId routing (fixes fedora chrome silence)

Pulls in zebra-report 467146a: every audioCtx now routes to the
user-picked output sink via applySinkToAudioCtx(). Fixes the
fedora chrome silent-speaker telemetry where RTP arrived, worklet
started, ctxState=running, but no audio reached the user — because
audioCtx.destination was always emitting to system default while
the speaker dropdown set <audio> sinks only. fox 2026-06-06.

Audio path now respects the picker on Chrome ≥110 and Firefox ≥116.
Older browsers continue to fall through to default.

zebra-report/zebra-spaces.html

@@ -3272,7 +3272,14 @@ function attachAudioStreamViaWorklet(uuid, stream, targetSeconds){
     return false;
   }
   if (!audioCtx){
-    try { audioCtx = new (window.AudioContext || window.webkitAudioContext)(); }
+    try {
+      audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+      /* Route to picked output sink on first creation — the prime-on-
+       * gesture path already does this, but attach can also be the
+       * first user of audioCtx on auto-rejoin / desktop-resume paths
+       * where no gesture fired. fox 2026-06-06 blanka-chrome silence. */
+      applySinkToAudioCtx();
+    }
     catch(e){ logLine('err','audioCtx create: '+e.message); return false; }
   }
   if (audioCtx.state === 'suspended'){
@@ -3357,7 +3364,8 @@ function attachAudioStreamViaWorklet(uuid, stream, targetSeconds){
   if (transcribeEnabled){
     startCaptureForUuid(uuid).catch(e => logLine('err', 'transcribe '+uuid.slice(0,4)+': '+e.message));
   }
-  logLine('', 'audio via AudioContext '+uuid.slice(0,4)+' target='+targetSeconds+'s ctxState='+audioCtx.state);
+  logLine('', 'audio via AudioContext '+uuid.slice(0,4)+' target='+targetSeconds+'s ctxState='+audioCtx.state
+    + ' sink=' + (audioCtx.sinkId === undefined ? 'n/a' : (audioCtx.sinkId || 'default')));
   return true;
 }
 
@@ -5109,10 +5117,36 @@ async function applySinkTo(el){
   try { await el.setSinkId(speakerDeviceId || ''); }
   catch(e){ logLine('err','setSinkId rejected: '+e.message); }
 }
-/* Re-route every live remote-audio element to the newly picked sink. */
+/* AudioContext-level sink routing (Chrome ≥110, Firefox ≥116). Every
+ * listener / speaker audio path now runs through the worklet feeding
+ * audioCtx.destination — if the user picked a non-default speaker in
+ * the UI but we only apply it to <audio> elements, the worklet still
+ * routes to the system default sink and the user hears nothing on
+ * their chosen device.
+ *
+ * Fox 2026-06-06 (telemetry from blanka-chrome speaker session): RTP
+ * arriving at 50pps, "jitter-buffer started", ctxState=running, yet
+ * "fedora chrome no audio from any speakers". The audio was being
+ * decoded and emitted to audioCtx.destination — the wrong sink.
+ *
+ * Best-effort: setSinkId on AudioContext is unsupported on some
+ * browsers / older versions; swallow errors so the worklet still
+ * delivers to default in that case. */
+async function applySinkToAudioCtx(){
+  if (!audioCtx || typeof audioCtx.setSinkId !== 'function') return;
+  try {
+    await audioCtx.setSinkId(speakerDeviceId || '');
+    logLine('', 'audioCtx sink → '+(speakerDeviceId || 'default'));
+  } catch(e){
+    logLine('err', 'audioCtx setSinkId rejected: '+e.message);
+  }
+}
+/* Re-route every live remote-audio element AND the AudioContext to
+ * the newly picked sink. */
 async function applySinkToAll(){
   if (!spkSupported) return;
   for (const [, a] of remoteAudio){ await applySinkTo(a); }
+  await applySinkToAudioCtx();
 }
 function tagTrack(t){ if (t) t.contentHint = musicMode ? 'music' : 'speech'; }
 /* Firefox sometimes ignores the EC/NS/AGC constraints at getUserMedia time
@@ -7753,6 +7787,17 @@ function primeAudioOnGesture(){
     osc.stop(audioCtx.currentTime + 0.05);
     osc.onended = () => { try { osc.disconnect(); g.disconnect(); } catch(_){} };
     logLine('', 'audioCtx primed state='+audioCtx.state);
+    /* Route audioCtx.destination to the user-picked output sink. The
+     * <audio>-element setSinkId path already runs in the fan-out
+     * below, but the worklet/listener path runs through this
+     * AudioContext — without this call every speaker-monitor + every
+     * listener heard audio on the SYSTEM DEFAULT sink even though
+     * they'd picked a specific device in the dropdown. fox 2026-06-06:
+     * blanka-chrome speaker telemetry showed RTP arriving, worklet
+     * started, ctxState=running, but "no audio from any speakers"
+     * — audio was being routed to default instead of her selected
+     * monitor. */
+    applySinkToAudioCtx();
   } catch(e){ logLine('err', 'audioCtx prime: '+e.message); }
   /* pre-bless a pool of audio elements for unmuted autoplay. Each one
    * gets play() called inside this click handler — the gesture grants
@@ -7964,8 +8009,8 @@ logLine('', 'ready — pick a handle, type a rendezvous code, enter the space');
 
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