Replace prints with logs and fix grammar (#437)

* refactor: replace print statements with proper logging and fix grammar

- Fix English grammar errors in existing log messages
- Add tracing imports where needed
- Improve log message clarity and consistency
- Follow project logging best practices using tracing crate

* fix: resolve clippy warnings and format code

- Fix unused import warnings by making test imports conditional with #[cfg(test)]
- Fix unused variable warning by prefixing with underscore
- Run cargo fmt to fix formatting issues
- Ensure all code passes clippy checks with -D warnings flag

* refactor: move tracing::debug import into test module

Move the tracing::debug import from file-level #[cfg(test)] into the test module itself for better code organization and consistency with other test modules

* Checkpoint before follow-up message

Co-authored-by: anzhengchao <anzhengchao@gmail.com>

* refactor: move tracing::debug import into test module in user_agent.rs

Complete the refactoring by moving the tracing::debug import from file-level #[cfg(test)] into the test module for consistency across all test files

---------

Co-authored-by: Cursor Agent <cursoragent@cursor.com>

crates/utils/src/os/linux.rs

@@ -170,6 +170,7 @@ fn read_stat(file_name: &str) -> std::io::Result<Vec<u64>> {
 #[cfg(test)]
 mod test {
     use super::get_drive_stats;
+    use tracing::debug;
 
     #[ignore] // FIXME: failed in github actions
     #[test]
@@ -177,6 +178,6 @@ mod test {
         let major = 7;
         let minor = 11;
         let s = get_drive_stats(major, minor).unwrap();
-        println!("{s:?}");
+        debug!("Drive stats for major: {}, minor: {} - {:?}", major, minor, s);
     }
 }

crates/utils/src/os/mod.rs

@@ -74,8 +74,7 @@ mod tests {
         let temp_dir = tempfile::tempdir().unwrap();
         let info = get_info(temp_dir.path()).unwrap();
 
-        println!("Disk Info: {info:?}");
-
+        // Verify disk info is valid
         assert!(info.total > 0);
         assert!(info.free > 0);
         assert!(info.used > 0);
@@ -109,10 +108,9 @@ mod tests {
         let path1 = temp_dir1.path().to_str().unwrap();
         let path2 = temp_dir2.path().to_str().unwrap();
 
-        let result = same_disk(path1, path2).unwrap();
+        let _result = same_disk(path1, path2).unwrap();
         // Since both temporary directories are created in the same file system,
         // they should be on the same disk in most cases
-        println!("Path1: {path1}, Path2: {path2}, Same disk: {result}");
         // Test passes if the function doesn't panic - the actual result depends on test environment
     }