处理不足 batch_size 的片段

src-tauri/src/task.rs

@@ -285,6 +285,7 @@ async fn run_pipeline(
 
     // Close channel to signal translation worker to flush and finish
     drop(segment_tx);
+    drop(seg_tx_for_callback);
     if let Some(handle) = translate_join_handle {
         handle.await.unwrap_or_else(|join_error| {
             eprintln!("translation worker panicked: {join_error:?}");