test(parser): add parseReceivers tests for widened geb pattern

Verify comma-prefix, no-dot, and multi-word maiden name variants
are correctly stripped in parseReceivers().

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

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

@@ -24,6 +24,18 @@ class PersonNameParserTest {
                 .containsExactly("Eugenie de Gruyter");
     }
 
+    @Test
+    void gebAnnotation_noDot_multiWord_stripped() {
+        assertThat(PersonNameParser.parseReceivers("Ella Dieckmann, geb de Gruyter"))
+                .containsExactly("Ella Dieckmann");
+    }
+
+    @Test
+    void gebAnnotation_noDot_singleWord_stripped() {
+        assertThat(PersonNameParser.parseReceivers("Elise Rockstroh geb Sintenis"))
+                .containsExactly("Elise Rockstroh");
+    }
+
     @Test
     void twoFirstNames_sharedKnownLastName_und() {
         assertThat(PersonNameParser.parseReceivers("Walter und Eugenie de Gruyter"))