codex review and fixes

crates/lanspread-peer/src/lib.rs

@@ -453,10 +453,14 @@ async fn download_chunk(
     let path = base_dir.join(&chunk.relative_path);
     let mut file = OpenOptions::new()
         .create(true)
-        .truncate(true)
         .write(true)
+        .truncate(false)
         .open(&path)
         .await?;
+    if chunk.length == 0 && chunk.offset == 0 {
+        // fallback-to-whole-file path replaces any existing partial data
+        file.set_len(0).await?;
+    }
     file.seek(std::io::SeekFrom::Start(chunk.offset)).await?;
 
     let mut remaining = chunk.length;
@@ -1252,8 +1256,11 @@ async fn run_peer_discovery(
     log::info!("Starting peer discovery task");
 
     loop {
-        match discover_service(LANSPREAD_SERVICE_TYPE) {
-            Ok(peer_addr) => {
+        let discovery_result =
+            tokio::task::spawn_blocking(|| discover_service(LANSPREAD_SERVICE_TYPE)).await;
+
+        match discovery_result {
+            Ok(Ok(peer_addr)) => {
                 log::info!("Discovered peer at: {peer_addr}");
 
                 // Add peer to database
@@ -1290,12 +1297,15 @@ async fn run_peer_discovery(
                     });
                 }
             }
-            Err(e) => {
+            Ok(Err(e)) => {
                 log::debug!("Peer discovery error: {e}");
                 tokio::time::sleep(Duration::from_secs(5)).await;
             }
+            Err(e) => {
+                log::error!("Peer discovery join error: {e}");
+                tokio::time::sleep(Duration::from_secs(5)).await;
+            }
         }
-
         // Wait before next discovery cycle
         tokio::time::sleep(Duration::from_secs(10)).await;
     }