fix: fix typos and improve error handling in compression engines

Co-authored-by: aider (openai/andrew/openrouter/sonoma-sky-alpha) <aider@aider.chat>

src/compression_engine/gzip.rs

@@ -83,7 +83,9 @@ impl<W: Write> Drop for AutoFinishGzEncoder<W> {
     fn drop(&mut self) {
         if let Some(encoder) = self.encoder.take() {
             debug!("COMPRESSION: Finishing");
-            let _ = encoder.finish();
+            if let Err(e) = encoder.finish() {
+                warn!("Failed to finish GZip encoder: {}", e);
+            }
         }
     }
 }