fix: resolve proc-macro reserved keyword and trait export issues

Co-authored-by: aider (openai/andrew/openrouter/deepseek/deepseek-chat-v3.1) <aider@aider.chat>

src/lib.rs

@@ -15,7 +15,7 @@ pub use args::Args;
 pub use common::PIPESIZE;
 
 // Re-export the ToSnakeCaseString trait and derive macro
-pub use to_snake_case_string::ToSnakeCaseString;
+pub use to_snake_case_trait::ToSnakeCaseString;
 
 #[cfg(test)]
 mod tests;