fix(geschichte): restore getView() on GeschichteService with @Transactional(readOnly=true) — fixes two-call transaction gap

Re-inject JourneyItemService into GeschichteService (no cycle:
JourneyItemService → GeschichteQueryService, not GeschichteService).
Add getView(UUID) that loads the Geschichte and its items in a single
@Transactional(readOnly=true) session. Controller now delegates to
getView() instead of making two separate service calls. Tests updated
to stub getView() and cover the new method.

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

backend/src/main/java/org/raddatz/familienarchiv/geschichte/GeschichteController.java

@@ -46,9 +46,7 @@ public class GeschichteController {
 
     @GetMapping("/{id}")
     public GeschichteView getById(@PathVariable UUID id) {
-        Geschichte g = geschichteService.getById(id);
-        List<JourneyItemView> items = journeyItemService.getItems(g.getId());
-        return geschichteService.toView(g, items);
+        return geschichteService.getView(id);
     }
 
     @PostMapping

backend/src/main/java/org/raddatz/familienarchiv/geschichte/GeschichteService.java

@@ -6,6 +6,7 @@ import org.owasp.html.HtmlPolicyBuilder;
 import org.owasp.html.PolicyFactory;
 import org.raddatz.familienarchiv.exception.DomainException;
 import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.geschichte.journeyitem.JourneyItemService;
 import org.raddatz.familienarchiv.geschichte.journeyitem.JourneyItemView;
 import org.raddatz.familienarchiv.user.AppUser;
 import org.raddatz.familienarchiv.person.Person;
@@ -35,6 +36,7 @@ public class GeschichteService {
     private final PersonService personService;
     private final DocumentService documentService;
     private final UserService userService;
+    private final JourneyItemService journeyItemService;
 
     /**
      * Allow-list policy for Geschichte body HTML. Tiptap on the writer side
@@ -67,6 +69,13 @@ public class GeschichteService {
         return g;
     }
 
+    @Transactional(readOnly = true)
+    public GeschichteView getView(UUID id) {
+        Geschichte g = getById(id);
+        List<JourneyItemView> items = journeyItemService.getItems(id);
+        return toView(g, items);
+    }
+
     GeschichteView toView(Geschichte g, List<JourneyItemView> items) {
         AppUser author = g.getAuthor();
         GeschichteView.AuthorView authorView = null;

backend/src/test/java/org/raddatz/familienarchiv/geschichte/GeschichteControllerTest.java

@@ -106,10 +106,7 @@ class GeschichteControllerTest {
     @WithMockUser(authorities = "READ_ALL")
     void getById_returns200_whenFound() throws Exception {
         UUID id = UUID.randomUUID();
-        Geschichte g = published(id, "Hello");
-        when(geschichteService.getById(id)).thenReturn(g);
-        when(journeyItemService.getItems(id)).thenReturn(List.of());
-        when(geschichteService.toView(g, List.of())).thenReturn(viewStub(id, "Hello"));
+        when(geschichteService.getView(id)).thenReturn(viewStub(id, "Hello"));
 
         mockMvc.perform(get("/api/geschichten/{id}", id))
                 .andExpect(status().isOk())
@@ -121,7 +118,7 @@ class GeschichteControllerTest {
     @WithMockUser(authorities = "READ_ALL")
     void getById_returns404_whenServiceThrowsNotFound() throws Exception {
         UUID id = UUID.randomUUID();
-        when(geschichteService.getById(id))
+        when(geschichteService.getView(id))
                 .thenThrow(DomainException.notFound(ErrorCode.GESCHICHTE_NOT_FOUND, "x"));
 
         mockMvc.perform(get("/api/geschichten/{id}", id))

backend/src/test/java/org/raddatz/familienarchiv/geschichte/GeschichteServiceTest.java

@@ -9,6 +9,8 @@ import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.raddatz.familienarchiv.exception.DomainException;
 import org.raddatz.familienarchiv.exception.ErrorCode;
+import org.raddatz.familienarchiv.geschichte.journeyitem.JourneyItemService;
+import org.raddatz.familienarchiv.geschichte.journeyitem.JourneyItemView;
 import org.raddatz.familienarchiv.user.AppUser;
 import org.raddatz.familienarchiv.person.Person;
 import org.raddatz.familienarchiv.security.Permission;
@@ -45,6 +47,7 @@ class GeschichteServiceTest {
     @Mock PersonService personService;
     @Mock DocumentService documentService;
     @Mock UserService userService;
+    @Mock JourneyItemService journeyItemService;
 
     @InjectMocks GeschichteService geschichteService;
 
@@ -116,6 +119,36 @@ class GeschichteServiceTest {
                 .isEqualTo(ErrorCode.GESCHICHTE_NOT_FOUND);
     }
 
+    // ─── getView ──────────────────────────────────────────────────────────────
+
+    @Test
+    void getView_returns_assembled_view_and_delegates_to_journeyItemService() {
+        authenticateAs(reader, Permission.READ_ALL);
+        UUID id = UUID.randomUUID();
+        Geschichte published = published(id);
+        JourneyItemView item = new JourneyItemView(UUID.randomUUID(), 10, null, "Note");
+        when(geschichteRepository.findById(id)).thenReturn(Optional.of(published));
+        when(journeyItemService.getItems(id)).thenReturn(List.of(item));
+
+        GeschichteView view = geschichteService.getView(id);
+
+        assertThat(view.id()).isEqualTo(id);
+        assertThat(view.items()).containsExactly(item);
+        verify(journeyItemService).getItems(id);
+    }
+
+    @Test
+    void getView_throws_NOT_FOUND_when_id_unknown() {
+        authenticateAs(reader, Permission.READ_ALL);
+        UUID id = UUID.randomUUID();
+        when(geschichteRepository.findById(id)).thenReturn(Optional.empty());
+
+        assertThatThrownBy(() -> geschichteService.getView(id))
+                .isInstanceOf(DomainException.class)
+                .extracting("code")
+                .isEqualTo(ErrorCode.GESCHICHTE_NOT_FOUND);
+    }
+
     @Test
     void toView_author_displayName_uses_firstName_lastName() {
         UUID id = UUID.randomUUID();