Improve LightRAG knowledge search locator alignment

rust/crates/mnote-web/src/routes/local_search_index.rs

@@ -3685,11 +3685,12 @@ fn score_evidence_text_match(text: &str, query: &str) -> Option<EvidenceTextMatc
                     .map(|index| (alternative.clone(), index))
             })
             .collect::<Vec<_>>();
-        let partial_allowed = if terms.len() > 1 {
-            !partial_matches.is_empty()
-        } else {
-            partial_matches.len() >= 2 || term.normalized.chars().count() <= 2
-        };
+        let partial_allowed = !partial_matches.is_empty()
+            && if terms.len() > 1 {
+                true
+            } else {
+                partial_matches.len() >= 2
+            };
         if partial_allowed {
             partial_count += 1;
             if let Some((_, index)) = partial_matches.first() {
@@ -4198,6 +4199,12 @@ mod tests {
         let _ = fs::remove_dir_all(&root);
     }
 
+    #[test]
+    fn local_search_two_char_cjk_query_requires_real_match() {
+        assert!(score_evidence_text_match("13. N -甲基吗啉 N -氧化物", "吗啉").is_some());
+        assert!(score_evidence_text_match("Scope Alpha SOURCE SCOPE RAG", "吗啉").is_none());
+    }
+
     #[test]
     fn local_index_settings_restricts_search_and_evidence_scope() {
         let root = temp_root("mnote-local-index-settings-scope");