fix: remove unused imports and parameters

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

src/modes/save.rs

@@ -51,7 +51,7 @@ pub fn mode_save(
         writer: stdout.lock(),
     };
 
-    let _item_id = item_service.save_item(tee_reader, cmd, settings, tags, conn)?;
+    item_service.save_item(tee_reader, cmd, settings, tags, conn)?;
 
     Ok(())
 }