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/settings.rs

@@ -9,13 +9,15 @@ use tauri::State;
 
 use crate::state::AppState;
 
+use super::err_str;
+
 /// 取单个 key 的值(JSON 字符串),不存在返回 None
 #[tauri::command]
 pub async fn settings_get(
     state: State<'_, AppState>,
     key: String,
 ) -> Result<Option<String>, String> {
-    state.settings.get(&key).await.map_err(|e| e.to_string())
+    state.settings.get(&key).await.map_err(err_str)
 }
 
 /// 写 key/value(`INSERT OR REPLACE`),刷新 updated_at
@@ -25,7 +27,7 @@ pub async fn settings_set(
     key: String,
     value: String,
 ) -> Result<bool, String> {
-    state.settings.set(&key, &value).await.map_err(|e| e.to_string())
+    state.settings.set(&key, &value).await.map_err(err_str)
 }
 
 /// 取全部 key/value(前端启动时一次性拉回恢复偏好)
@@ -33,7 +35,7 @@ pub async fn settings_set(
 pub async fn settings_get_all(
     state: State<'_, AppState>,
 ) -> Result<HashMap<String, String>, String> {
-    let rows = state.settings.get_all().await.map_err(|e| e.to_string())?;
+    let rows = state.settings.get_all().await.map_err(err_str)?;
     Ok(rows.into_iter().collect())
 }
 
@@ -43,5 +45,5 @@ pub async fn settings_delete(
     state: State<'_, AppState>,
     key: String,
 ) -> Result<bool, String> {
-    state.settings.delete(&key).await.map_err(|e| e.to_string())
+    state.settings.delete(&key).await.map_err(err_str)
 }