fix: remove unused imports and resolve config module conflicts

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

src/modes/diff.rs

@@ -3,6 +3,7 @@ use clap::Command;
 use std::io::Read;
 use std::os::fd::FromRawFd;
 use std::str::FromStr;
+use crate::config;
 
 fn validate_diff_args(cmd: &mut Command, ids: &Vec<i64>, tags: &Vec<String>) {
     if !tags.is_empty() {
@@ -293,8 +294,8 @@ fn handle_diff_output(
 
 pub fn mode_diff(
     cmd: &mut Command,
-    _settings: &crate::config::Settings,
-    _config: &crate::config::Config,
+    _settings: &config::Settings,
+    _config: &config::Config,
     ids: &mut Vec<i64>,
     tags: &mut Vec<String>,
     conn: &mut rusqlite::Connection,