fix copilot

Author: rui-ren

samples/js/live-audio-transcription-example/README.md

@@ -54,5 +54,5 @@ for await (const result of session.getTranscriptionStream()) {
     console.log(result.is_final);              // true for final results
 }
 
-await client.stop();
+await session.stop();
 ```

samples/js/live-audio-transcription-example/app.js

@@ -93,9 +93,15 @@ try {
         }
     });
 
+    let appendPending = false;
     audioInput.on('data', (buffer) => {
+        if (appendPending) return; // drop frame while backpressured
         const pcm = new Uint8Array(buffer);
-        session.append(pcm).catch((err) => {
+        appendPending = true;
+        session.append(pcm).then(() => {
+            appendPending = false;
+        }).catch((err) => {
+            appendPending = false;
             console.error('append error:', err.message);
         });
     });

sdk/js/src/openai/liveAudioTranscriptionClient.ts

@@ -66,6 +66,10 @@ class AsyncQueue<T> {
             });
         }
 
+        if (this.completed) {
+            throw new Error('Cannot write to a completed queue.');
+        }
+
         this.queue.push(item);
     }
 
@@ -290,6 +294,9 @@ export class LiveAudioTranscriptionSession {
                         `Push failed (code=${errorInfo?.code ?? 'UNKNOWN'}): ${errorMsg}`,
                         { cause: error }
                     );
+                    this.stopped = true;
+                    this.started = false;
+                    this.pushQueue?.complete(fatalError);
                     this.outputQueue?.complete(fatalError);
                     return;
                 }
@@ -388,8 +395,8 @@ export class LiveAudioTranscriptionSession {
             if (this.started && !this.stopped) {
                 await this.stop();
             }
-        } catch (error) {
-            console.warn('Error during dispose cleanup:', error instanceof Error ? error.message : String(error));
+        } catch {
+            // Swallow errors during best-effort cleanup to keep dispose() silent.
         }
     }
 }