fix: Trim trailing whitespace from printed tables

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

src/modes/list.rs

@@ -167,7 +167,7 @@ pub fn mode_list(
         table.add_row(table_row);
     }
 
-    println!("{}", table);
+    println!("{}", table.trim_end());
 
     Ok(())
 }