fix: make cmd mutable and remove unused import

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

src/main.rs

@@ -18,7 +18,7 @@ fn main() -> Result<(), Error> {
     use std::fs;
     let proj_dirs = ProjectDirs::from("gt0.ca", "Andrew Phillips", "Keep");
 
-    let cmd = Args::command();
+    let mut cmd = Args::command();
     let args = Args::parse();
     
     // Validate arguments based on mode

src/modes/delete.rs

@@ -4,7 +4,6 @@ use std::path::PathBuf;
 use crate::config;
 use crate::services::error::CoreError;
 use crate::services::item_service::ItemService;
-use clap::error::ErrorKind;
 use clap::Command;
 use log::warn;
 use rusqlite::Connection;