fix: convert Fd to raw descriptor using .0 access

This addresses the E0412 error by correctly extracting the raw file descriptor from the nix::unistd::Fd newtype wrapper.

src/modes/diff.rs

@@ -147,7 +147,9 @@ pub fn mode_diff(
         compression_type: CompressionType,
         fd_write: nix::unistd::Fd,
     ) -> std::thread::JoinHandle<()> {
-        let pipe_writer_raw = unsafe { std::fs::File::from_raw_fd(fd_write.into_raw()) };
+        // Convert nix::unistd::Fd to raw fd
+        let raw_fd = fd_write.0;
+        let pipe_writer_raw = unsafe { std::fs::File::from_raw_fd(raw_fd) };
         std::thread::spawn(move || {
             write_item_to_pipe(
                 item_path,