fix(audit): add blockId to TEXT_SAVED audit payload

Required for dashboard Pulse stat 2 (COUNT DISTINCT blockId).
Without it, two saves on different blocks on the same page
were indistinguishable.

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

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

@@ -142,7 +142,8 @@ public class TranscriptionService {
         if (!text.equals(previousText)) {
             Optional<DocumentAnnotation> annotation = annotationRepository.findById(block.getAnnotationId());
             int pageNumber = annotation.map(DocumentAnnotation::getPageNumber).orElse(0);
-            auditService.logAfterCommit(AuditKind.TEXT_SAVED, userId, documentId, Map.of("pageNumber", pageNumber));
+            auditService.logAfterCommit(AuditKind.TEXT_SAVED, userId, documentId,
+                    Map.of("pageNumber", pageNumber, "blockId", saved.getId().toString()));
         }
 
         Document doc = documentService.getDocumentById(documentId);

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

@@ -487,6 +487,7 @@ class TranscriptionServiceTest {
                 org.mockito.ArgumentMatchers.eq(docId),
                 payloadCaptor.capture());
         assertThat(payloadCaptor.getValue()).containsEntry("pageNumber", 3);
+        assertThat(payloadCaptor.getValue()).containsEntry("blockId", blockId.toString());
     }
 
     @Test