fix: Update error message and comments

Author: reddevilmidzy

src/file_manager/git.rs

@@ -50,7 +50,7 @@ impl GitManager {
             Ok(head_ref) => {
                 let head = head_ref
                     .target()
-                    .ok_or_else(|| anyhow::anyhow!("HEAD refers to non-HEAD"))?;
+                    .ok_or_else(|| anyhow::anyhow!("HEAD does not point to a valid commit"))?;
                 vec![repo.find_commit(head)?]
             }
             Err(_) => Vec::new(),
@@ -144,14 +144,14 @@ impl GitManager {
 
     fn status_to_string(status: git2::Status) -> String {
         match status {
-            // 아직 add 되지 않은 상태
+            // Not yet added to index
             git2::Status::WT_NEW => "ADDED".to_string(),
             git2::Status::WT_MODIFIED => "MODIFIED".to_string(),
             git2::Status::WT_DELETED => "DELETED".to_string(),
             git2::Status::WT_RENAMED => "RENAMED".to_string(),
             git2::Status::WT_TYPECHANGE => "TYPECHANGE".to_string(),
 
-            // stage 된 상태
+            // Staged state
             git2::Status::INDEX_NEW => "ADDED".to_string(),
             git2::Status::INDEX_MODIFIED => "MODIFIED".to_string(),
             git2::Status::INDEX_DELETED => "DELETED".to_string(),