fix(voice): re-check voice status on tab visibility change and after saving voice settings

frontend/src/App.vue

@@ -25,6 +25,15 @@ function startAppServices() {
   settingsStore.checkVoiceStatus();
   // Sync browser timezone to the server on every login/page load.
   apiPut("/api/settings", { user_timezone: Intl.DateTimeFormat().resolvedOptions().timeZone }).catch(() => {});
+  // Re-check voice status when the tab becomes visible again (model may
+  // have finished loading while the user was away).
+  document.addEventListener("visibilitychange", onVisibilityChange);
+}
+
+function onVisibilityChange() {
+  if (document.visibilityState === "visible" && authStore.isAuthenticated) {
+    settingsStore.checkVoiceStatus();
+  }
 }
 
 function stopAppServices() {
@@ -150,6 +159,7 @@ watch(
 
 onUnmounted(() => {
   document.removeEventListener("keydown", onGlobalKeydown);
+  document.removeEventListener("visibilitychange", onVisibilityChange);
   stopAppServices();
 });
 </script>