feat: implement unified settings system

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

src/modes/update.rs

@@ -13,7 +13,8 @@ use rusqlite::Connection;
 
 pub fn mode_update(
     cmd: &mut Command,
-    args: &crate::Args,
+    settings: &crate::config::Settings,
+    _config: &crate::config::Config,
     ids: &mut Vec<i64>,
     tags: &mut Vec<String>,
     conn: &mut Connection,
@@ -71,7 +72,7 @@ pub fn mode_update(
         }
     }
 
-    let digest_type = cmd_args_digest_type(cmd, args);
+    let digest_type = crate::modes::common::settings_digest_type(cmd, settings);
     let digest_meta = get_digest_type_meta(digest_type.clone());
     let digest_value = db::get_item_meta_value(&tx, &item, digest_meta)?;
 
@@ -115,9 +116,9 @@ pub fn mode_update(
         }
     }
 
-    if !args.item.meta.is_empty() {
+    if !settings.meta.is_empty() {
         debug!("MAIN: Updating item meta");
-        for kv in args.item.meta.iter() {
+        for kv in settings.meta.iter() {
             let meta = db::Meta {
                 id: item_id,
                 name: kv.key.to_string(),