fix: remove unused variable and add missing FromStr import

Co-authored-by: aider (openai/andrew/openrouter/qwen/qwen3-coder) <aider@aider.chat>

src/common/status.rs

@@ -72,7 +72,7 @@ pub fn generate_status_info(
                 },
             };
 
-        let is_default = compression_type == default_type;
+        let _is_default = compression_type == default_type;
         let is_enabled = enabled_compression_type.as_ref().map_or(false, |ct| *ct == compression_type);
         let binary = if compression_program.program.is_empty() {
             "<INTERNAL>".to_string()