Fix voice button audio unlock hang

static/app.js

@@ -59,12 +59,17 @@ function addBubble(text, role = "assistant") {
 
 async function unlockAudio() {
   if (audioUnlocked) return;
-  const audio = new Audio();
-  audio.muted = true;
   try {
-    await audio.play();
+    const AudioContext = window.AudioContext || window.webkitAudioContext;
+    if (AudioContext) {
+      const context = new AudioContext();
+      if (context.state === "suspended") {
+        await context.resume();
+      }
+      await context.close();
+    }
   } catch {
-    // Mobile browsers only need the attempt to happen inside a tap handler.
+    // The click itself is enough to authorize later playback in most browsers.
   }
   audioUnlocked = true;
 }
@@ -97,6 +102,7 @@ async function sendText() {
 }
 
 async function toggleVoice() {
+  setStatus("Activation du micro", "live");
   await unlockAudio();
 
   if (!navigator.mediaDevices || !navigator.mediaDevices.getUserMedia) {