fix(gemini-web): Correct ambiguity check in conversation lookup

internal/provider/gemini-web/conversation/index.go

@@ -108,6 +108,8 @@ func LookupMatch(hash string) (MatchRecord, bool, error) {
 		return MatchRecord{}, false, err
 	}
 	var foundOne bool
+	var ambiguous bool
+	var firstLabel string
 	var single MatchRecord
 	err = db.View(func(tx *bolt.Tx) error {
 		bucket := tx.Bucket([]byte(bucketMatches))
@@ -129,12 +131,18 @@ func LookupMatch(hash string) (MatchRecord, bool, error) {
 			if strings.TrimSpace(rec.AccountLabel) == "" || rec.PrefixLen <= 0 {
 				continue
 			}
-            if foundOne {
+			label := strings.ToLower(strings.TrimSpace(rec.AccountLabel))
-                // More than one distinct label exists for this hash; ambiguous.
+			if !foundOne {
-                return nil
+				firstLabel = label
-            }
 				single = rec
 				foundOne = true
+				continue
+			}
+			if label != firstLabel {
+				ambiguous = true
+				// Early exit scan; ambiguity detected.
+				return nil
+			}
 		}
 		if foundOne {
 			return nil
@@ -149,6 +157,9 @@ func LookupMatch(hash string) (MatchRecord, bool, error) {
 	if err != nil {
 		return MatchRecord{}, false, err
 	}
+	if ambiguous {
+		return MatchRecord{}, false, nil
+	}
 	if strings.TrimSpace(single.AccountLabel) == "" || single.PrefixLen <= 0 {
 		return MatchRecord{}, false, nil
 	}