test(search): add sender name FTS coverage and combined filter test

- should_find_document_by_sender_name — symmetric with existing receiver test
- fts_combined_with_status_filter_excludes_non_matching_status — verifies
  hasIds(rankedIds).and(hasStatus(...)) two-phase search works together

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

backend/src/test/java/org/raddatz/familienarchiv/repository/DocumentFtsTest.java

@@ -16,12 +16,16 @@ import org.springframework.boot.data.jpa.test.autoconfigure.DataJpaTest;
 import org.springframework.boot.jdbc.test.autoconfigure.AutoConfigureTestDatabase;
 import org.springframework.context.annotation.Import;
 
+import org.springframework.data.jpa.domain.Specification;
+
 import java.util.List;
 import java.util.Set;
 import java.util.UUID;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatNoException;
+import static org.raddatz.familienarchiv.repository.DocumentSpecifications.hasIds;
+import static org.raddatz.familienarchiv.repository.DocumentSpecifications.hasStatus;
 
 @DataJpaTest
 @AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
@@ -193,6 +197,24 @@ class DocumentFtsTest {
         assertThat(ids).contains(doc.getId());
     }
 
+    @Test
+    void should_find_document_by_sender_name() {
+        Person sender = personRepository.saveAndFlush(
+                Person.builder().firstName("Walter").lastName("Raddatz").build());
+        Document doc = documentRepository.saveAndFlush(Document.builder()
+                .title("Brief")
+                .originalFilename("brief.pdf")
+                .status(DocumentStatus.UPLOADED)
+                .sender(sender)
+                .build());
+        em.flush();
+        em.clear();
+
+        List<UUID> ids = documentRepository.findRankedIdsByFts("Raddatz");
+
+        assertThat(ids).contains(doc.getId());
+    }
+
     // ─── Weight D: tag names ───────────────────────────────────────────────────
 
     @Test
@@ -212,6 +234,29 @@ class DocumentFtsTest {
         assertThat(ids).hasSize(1);
     }
 
+    // ─── Combined FTS + Specification filter ──────────────────────────────────
+
+    @Test
+    void fts_combined_with_status_filter_excludes_non_matching_status() {
+        documentRepository.saveAndFlush(document("Grundbuch"));  // UPLOADED
+        documentRepository.saveAndFlush(Document.builder()
+                .title("Grundbuch")
+                .originalFilename("grundbuch_ph.pdf")
+                .status(DocumentStatus.PLACEHOLDER)
+                .build());
+        em.flush();
+        em.clear();
+
+        List<UUID> rankedIds = documentRepository.findRankedIdsByFts("Grundbuch");
+        Specification<Document> spec = Specification.where(hasIds(rankedIds))
+                .and(hasStatus(DocumentStatus.UPLOADED));
+
+        List<Document> result = documentRepository.findAll(spec);
+
+        assertThat(result).hasSize(1);
+        assertThat(result.get(0).getStatus()).isEqualTo(DocumentStatus.UPLOADED);
+    }
+
     // ─── Helpers ───────────────────────────────────────────────────────────────
 
     private Document document(String title) {