feat(parser): normalize dot-compressed names in split()

Inserts spaces after dots when the cleaned name has no spaces but
contains dots, so the existing last-space fallback handles names
like "E.Rockstroh" and "Dr.Fr.Zarncke" correctly.

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

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

@@ -123,6 +123,11 @@ public class PersonNameParser {
 
         String cleaned = GEB_PATTERN.matcher(rawName).replaceAll("").trim();
 
+        // Normalize dot-compressed names: "Dr.Fr.Zarncke" -> "Dr. Fr. Zarncke"
+        if (!cleaned.contains(" ") && cleaned.contains(".")) {
+            cleaned = cleaned.replace(".", ". ").trim();
+        }
+
         String lastName = findKnownLastName(cleaned);
         if (lastName != null) {
             String firstName = cleaned.substring(0, cleaned.length() - lastName.length()).trim();

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

@@ -133,6 +133,42 @@ class PersonNameParserTest {
         assertThat(result.lastName()).isEqualTo("de Gruyter");
     }
 
+    // --- split — dot-compressed names ---
+
+    @Test
+    void split_dotCompressed_initialAndLastName() {
+        PersonNameParser.SplitName result = PersonNameParser.split("E.Rockstroh");
+        assertThat(result.firstName()).isEqualTo("E.");
+        assertThat(result.lastName()).isEqualTo("Rockstroh");
+    }
+
+    @Test
+    void split_dotCompressed_twoInitials() {
+        PersonNameParser.SplitName result = PersonNameParser.split("E.M.");
+        assertThat(result.firstName()).isEqualTo("E.");
+        assertThat(result.lastName()).isEqualTo("M.");
+    }
+
+    @Test
+    void split_dotCompressed_titleFirstNameLastName() {
+        PersonNameParser.SplitName result = PersonNameParser.split("Dr.Fr.Zarncke");
+        assertThat(result.firstName()).isEqualTo("Dr. Fr.");
+        assertThat(result.lastName()).isEqualTo("Zarncke");
+    }
+
+    @Test
+    void split_dotCompressed_titleAndLastName() {
+        PersonNameParser.SplitName result = PersonNameParser.split("Dr.Zarnke");
+        assertThat(result.firstName()).isEqualTo("Dr.");
+        assertThat(result.lastName()).isEqualTo("Zarnke");
+    }
+
+    @Test
+    void parseReceivers_dotCompressedName_passthrough() {
+        assertThat(PersonNameParser.parseReceivers("Dr.Fr.Zarncke"))
+                .containsExactly("Dr.Fr.Zarncke");
+    }
+
     // --- parseReceivers — shared last name with full-name part ─────────────────
 
     @Test