fix: resolve compilation errors by adding missing ErrorKind import and removing unused imports

Co-authored-by: aider (openai/andrew/openrouter/anthropic/claude-sonnet-4) <aider@aider.chat>

src/main.rs

@@ -2,6 +2,7 @@ use std::path::PathBuf;
 
 use anyhow::{Context, Error, Result, anyhow};
 use clap::*;
+use clap::error::ErrorKind;
 use log::*;
 mod modes;
 
@@ -11,7 +12,6 @@ use directories::ProjectDirs;
 extern crate prettytable;
 
 use std::str::FromStr;
-use serde::{Deserialize, Serialize};
 
 extern crate lazy_static;