feat(frontend): replace all name concatenation with displayName

- Add displayName default method to PersonSummaryDTO
- Update native SQL queries to include title, person_type columns
- Add getInitials() utility to personFormat.ts
- Update abbreviateName/abbreviateCompact for nullable firstName
- Replace firstName+lastName concatenation with displayName in all
  person-displaying components and server load files
- Regenerate API types with displayName on Person and PersonSummaryDTO

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

backend/src/main/java/org/raddatz/familienarchiv/dto/PersonSummaryDTO.java

@@ -9,11 +9,21 @@ import java.util.UUID;
  */
 public interface PersonSummaryDTO {
     UUID getId();
+    String getTitle();
     String getFirstName();
     String getLastName();
+    String getPersonType();
     String getAlias();
     Integer getBirthYear();
     Integer getDeathYear();
     String getNotes();
     long getDocumentCount();
+
+    default String getDisplayName() {
+        StringBuilder sb = new StringBuilder();
+        if (getTitle() != null) sb.append(getTitle()).append(" ");
+        if (getFirstName() != null) sb.append(getFirstName()).append(" ");
+        sb.append(getLastName());
+        return sb.toString().trim();
+    }
 }

backend/src/main/java/org/raddatz/familienarchiv/repository/PersonRepository.java

@@ -35,7 +35,8 @@ public interface PersonRepository extends JpaRepository<Person, UUID> {
     // --- PersonSummaryDTO with document count ---
 
     @Query(value = """
-            SELECT p.id, p.first_name AS firstName, p.last_name AS lastName,
+            SELECT p.id, p.title, p.first_name AS firstName, p.last_name AS lastName,
+                   p.person_type AS personType,
                    p.alias, p.birth_year AS birthYear, p.death_year AS deathYear, p.notes,
                    (SELECT COUNT(*) FROM documents d WHERE d.sender_id = p.id)
                    + (SELECT COUNT(*) FROM document_receivers dr WHERE dr.person_id = p.id) AS documentCount
@@ -46,7 +47,8 @@ public interface PersonRepository extends JpaRepository<Person, UUID> {
     List<PersonSummaryDTO> findAllWithDocumentCount();
 
     @Query(value = """
-            SELECT p.id, p.first_name AS firstName, p.last_name AS lastName,
+            SELECT p.id, p.title, p.first_name AS firstName, p.last_name AS lastName,
+                   p.person_type AS personType,
                    p.alias, p.birth_year AS birthYear, p.death_year AS deathYear, p.notes,
                    (SELECT COUNT(*) FROM documents d WHERE d.sender_id = p.id)
                    + (SELECT COUNT(*) FROM document_receivers dr WHERE dr.person_id = p.id) AS documentCount
@@ -56,7 +58,7 @@ public interface PersonRepository extends JpaRepository<Person, UUID> {
                OR LOWER(CONCAT(p.last_name,' ',COALESCE(p.first_name,''))) LIKE LOWER(CONCAT('%',:query,'%'))
                OR LOWER(p.alias) LIKE LOWER(CONCAT('%',:query,'%'))
                OR LOWER(a.last_name) LIKE LOWER(CONCAT('%',:query,'%'))
-            GROUP BY p.id, p.first_name, p.last_name, p.alias, p.birth_year, p.death_year, p.notes
+            GROUP BY p.id, p.title, p.first_name, p.last_name, p.person_type, p.alias, p.birth_year, p.death_year, p.notes
             ORDER BY p.last_name ASC, p.first_name ASC
             """,
             nativeQuery = true)

backend/src/test/java/org/raddatz/familienarchiv/controller/PersonControllerTest.java

@@ -73,8 +73,10 @@ class PersonControllerTest {
     private PersonSummaryDTO mockPersonSummary(String firstName, String lastName) {
         return new PersonSummaryDTO() {
             public java.util.UUID getId() { return UUID.randomUUID(); }
+            public String getTitle() { return null; }
             public String getFirstName() { return firstName; }
             public String getLastName() { return lastName; }
+            public String getPersonType() { return "PERSON"; }
             public String getAlias() { return null; }
             public Integer getBirthYear() { return null; }
             public Integer getDeathYear() { return null; }