下载/主界面优化

src-tauri/src/download_engine/http_dl.rs

@@ -318,13 +318,14 @@ async fn download_segment_with_client(
         match stream.next().await {
             Some(Ok(chunk)) => {
                 buf.extend_from_slice(&chunk);
+                // 接收到数据立即更新进度（避免监控周期内进度无变化导致速度显示为 0）
+                local_completed += chunk.len() as u64;
+                progress.store(local_completed, Ordering::Relaxed);
                 // 积累到 64KB 再写入（减少 I/O 次数）
                 if buf.len() >= 64 * 1024 {
                     file.write_all(&buf)
                         .await
                         .map_err(|e| format!("写入文件失败: {}", e))?;
-                    local_completed += buf.len() as u64;
-                    progress.store(local_completed, Ordering::Relaxed);
                     // 限速
                     limiter.consume(buf.len() as u64).await;
                     buf.clear();
@@ -339,8 +340,7 @@ async fn download_segment_with_client(
                     file.write_all(&buf)
                         .await
                         .map_err(|e| format!("写入文件失败: {}", e))?;
-                    local_completed += buf.len() as u64;
-                    progress.store(local_completed, Ordering::Relaxed);
+                    // local_completed 和 progress 已在接收 chunk 时更新
                     limiter.consume(buf.len() as u64).await;
                     buf.clear();
                 }