fix: implement default config path logic and remove unused variable warning

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

src/config.rs

@@ -80,13 +80,15 @@ impl Settings {
         } else if let Ok(env_config) = std::env::var("KEEP_CONFIG") {
             PathBuf::from(env_config)
         } else {
-            match Self::default_config_path() {
-                Ok(path) => path,
-                Err(e) => {
-                    debug!("CONFIG: Failed to get default config path: {}", e);
-                    PathBuf::from("~/.config/keep/config.yml")
-                }
-            }
+            let default_path = dirs::config_dir()
+                .map(|mut path| {
+                    path.push("keep");
+                    path.push("config.yml");
+                    path
+                })
+                .unwrap_or_else(|| PathBuf::from("~/.config/keep/config.yml"));
+            debug!("CONFIG: Using default config path: {:?}", default_path);
+            default_path
         };
         
         debug!("CONFIG: Using config path: {:?}", config_path);

src/modes/list.rs

@@ -87,7 +87,7 @@ pub fn mode_list(
     let mut title_row = row!();
 
     for column in &settings.list_format {
-        let column_type = ColumnType::from_str(&column.name)
+        let _column_type = ColumnType::from_str(&column.name)
             .map_err(|_| anyhow!("Unknown column {:?}", column.name))?;
 
         title_row.add_cell(Cell::new(&column.label).with_style(Attr::Bold));