fix: remove unused imports and fix test stdin handling

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

src/main.rs

@@ -9,7 +9,6 @@ extern crate directories;
 use directories::ProjectDirs;
 
 extern crate prettytable;
-use prettytable::format::consts::FORMAT_NO_BORDER_LINE_SEPARATOR;
 
 use std::str::FromStr;