fix(parser): preserve annotation parens for single-person inputs

Move paren extraction in parseReceivers() after the multi-separator
check so single-person entries like "Clara de Gruyter(*1871)" keep
their parens intact for split()'s annotation extraction. Multi-person
entries like "Hedi und Tutu (Gruber)" still use parens as shared
last-name override.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/src/main/java/org/raddatz/familienarchiv/service/PersonNameParser.java

@@ -59,7 +59,14 @@ public class PersonNameParser {
         // 1. Strip "geb. Xxx" maiden-name annotations
         String cleaned = GEB_PATTERN.matcher(raw).replaceAll("").trim();
 
-        // 2. Extract parenthesised last name override, e.g. "(Gruber)"
+        // 2. If no multi-separator present, this is a single person — leave parens
+        //    intact for split()'s annotation extraction
+        if (!MULTI_SEPARATOR.matcher(cleaned).find()) {
+            return List.of(cleaned);
+        }
+
+        // 3. Extract parenthesised last name override, e.g. "(Gruber)"
+        //    Only applies to multi-person entries like "Hedi und Tutu (Gruber)"
         String sharedLastName = null;
         Matcher parenMatcher = PAREN_LAST_NAME.matcher(cleaned);
         if (parenMatcher.find()) {
@@ -67,11 +74,6 @@ public class PersonNameParser {
             cleaned = cleaned.substring(0, parenMatcher.start()).trim();
         }
 
-        // 3. If no multi-separator present, this is a single person
-        if (!MULTI_SEPARATOR.matcher(cleaned).find()) {
-            return List.of(cleaned);
-        }
-
         // 4. Split on " und " / " u "
         String[] parts = MULTI_SEPARATOR.split(cleaned);
 

backend/src/test/java/org/raddatz/familienarchiv/service/PersonNameParserTest.java

@@ -24,6 +24,18 @@ class PersonNameParserTest {
                 .containsExactly("Eugenie de Gruyter");
     }
 
+    @Test
+    void singlePerson_annotationParenPreserved() {
+        assertThat(PersonNameParser.parseReceivers("Clara de Gruyter(*1871)"))
+                .containsExactly("Clara de Gruyter(*1871)");
+    }
+
+    @Test
+    void singlePerson_nicknameParenPreserved() {
+        assertThat(PersonNameParser.parseReceivers("Gertrud D.(Tuttu)"))
+                .containsExactly("Gertrud D.(Tuttu)");
+    }
+
     @Test
     void gebAnnotation_noDot_multiWord_stripped() {
         assertThat(PersonNameParser.parseReceivers("Ella Dieckmann, geb de Gruyter"))