优化: R-PD-10 commands err_str helper 统一错误格式化(87 处)

mod.rs 加 pub fn err_str<E: ToString>,commands/ 10 文件 87 处 .map_err(|e| e.to_string()) → .map_err(err_str),残留 0(10 处复杂表达式 e 用于 format!/anyhow 保留)。行为零变化,统一入口为未来加日志/分类留点。批5,cargo workspace 0

src-tauri/src/commands/ai/knowledge_inject.rs

@@ -13,6 +13,8 @@ use df_core::types::new_id;
 
 use crate::state::{AppState, ExtractTrigger, LlmConcurrency};
 
+use crate::commands::err_str;
+
 use super::{AiSession};
 
 /// 按配置构建 embedding provider + model。None = 配置缺失/provider 不存在。
@@ -240,7 +242,7 @@ pub async fn trigger_extraction_now(state: &AppState) -> Result<bool, String> {
         session.active_conversation_id.clone()
     };
     let conv_id = conv_id.ok_or_else(|| "当前无活跃对话".to_string())?;
-    let provider_config = super::prompt::get_active_provider(state).await.map_err(|e| e.to_string())?;
+    let provider_config = super::prompt::get_active_provider(state).await.map_err(err_str)?;
     let db = state.db.clone();
     let llm_concurrency = state.llm_concurrency.clone();
     tauri::async_runtime::spawn(async move {