chore: 修复 clippy error（loop never loops → if-let）并应用自动修复

src/core/summary.rs

@@ -106,8 +106,8 @@ pub async fn trigger_idle_summary(
 
 /// 生成摘要：优先使用 LLM，不可用时回退到简单截断
 async fn generate_summary(messages: &[Message], summarizer: Option<&Summarizer>) -> String {
-    if let Some(summarizer) = summarizer {
-        if messages.len() >= 3 {
+    if let Some(summarizer) = summarizer
+        && messages.len() >= 3 {
             let prompt = build_summary_prompt(messages);
             match summarizer(prompt).await {
                 Ok(text) if !text.is_empty() => {
@@ -117,7 +117,6 @@ async fn generate_summary(messages: &[Message], summarizer: Option<&Summarizer>)
                 _ => tracing::warn!("LLM 摘要失败，回退到简单截断"),
             }
         }
-    }
     summarize_messages(messages)
 }