Fix browser history audio export

frontend/src/App.jsx

@@ -496,6 +496,14 @@ function App() {
 
   const handleNativeExport = async (e, sourceIdentifier, fallbackName, mode) => {
     if (e) { e.preventDefault(); e.stopPropagation(); }
+    if (!isTauri) {
+      const filename = fallbackName || sourceIdentifier || 'audio.wav';
+      const audioUrl = sourceIdentifier?.startsWith?.('http')
+        ? sourceIdentifier
+        : `${API}/audio/${sourceIdentifier}`;
+      await triggerDownload(audioUrl, filename);
+      return;
+    }
     try {
       const { save } = await import('@tauri-apps/plugin-dialog');
       const ext = fallbackName.includes('.') ? fallbackName.split('.').pop() : 'wav';