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);
+            }
         }
     }
 }

src/compression_engine/lz4.rs

@@ -27,7 +27,7 @@ impl CompressionEngine for CompressionEngineLZ4 {
     }
 
     fn create(&self, file_path: PathBuf) -> Result<Box<dyn Write>> {
-        debug!("COMPRESSION: Writting to {:?} using {:?}", file_path, *self);
+        debug!("COMPRESSION: Writing to {:?} using {:?}", file_path, *self);
 
         let file = File::create(file_path)?;
         let lz4_write = FrameEncoder::new(file).auto_finish();

src/modes/diff.rs

@@ -4,8 +4,6 @@
 /// differences using external diff tools.
 use anyhow::{Context, Result};
 use clap::Command;
-use std::io::Read;
-use std::os::fd::FromRawFd;
 use crate::config;
 use crate::services::item_service::ItemService;
 use log::debug;