fix(#145): dashboard notification widget shows all recent notifications

- Add type-only filter to notification repo/service (previously only
  worked with type+read=false together)
- Dashboard widget now fetches all recent notifications (mentions +
  replies, both read and unread) instead of unread mentions only
- Update component heading and show type label per row

Root cause: Berit's mentions were read=true, so the unread-only filter
returned 0 results. The recent docs widget had no REVIEWED documents
because 'marking ready' sets metadata_complete, not status=REVIEWED.
Recent docs now shows all uploads without a status filter.

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

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

@@ -15,6 +15,9 @@ public interface NotificationRepository extends JpaRepository<Notification, UUID
 
     Page<Notification> findByRecipientIdOrderByCreatedAtDesc(UUID recipientId, Pageable pageable);
 
+    Page<Notification> findByRecipientIdAndTypeOrderByCreatedAtDesc(
+            UUID recipientId, NotificationType type, Pageable pageable);
+
     Page<Notification> findByRecipientIdAndTypeAndReadFalseOrderByCreatedAtDesc(
             UUID recipientId, NotificationType type, Pageable pageable);
 

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

@@ -98,6 +98,10 @@ public class NotificationService {
             return notificationRepository.findByRecipientIdAndTypeAndReadFalseOrderByCreatedAtDesc(userId, type, pageable)
                     .map(this::toDTO);
         }
+        if (type != null) {
+            return notificationRepository.findByRecipientIdAndTypeOrderByCreatedAtDesc(userId, type, pageable)
+                    .map(this::toDTO);
+        }
         return notificationRepository.findByRecipientIdOrderByCreatedAtDesc(userId, pageable)
                 .map(this::toDTO);
     }

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

@@ -79,6 +79,24 @@ class NotificationRepositoryTest {
         assertThat(result.getTotalElements()).isEqualTo(5);
     }
 
+    // ─── findByRecipientIdAndType (without read filter) ──────────────────────
+
+    @Test
+    void findByType_returnsBothReadAndUnreadMentions() {
+        notificationRepository.save(mention(userA, false)); // unread
+        notificationRepository.save(mention(userA, true));  // read — should also be included
+        notificationRepository.save(reply(userA, false));   // REPLY — excluded
+        notificationRepository.save(mention(userB, false)); // different user — excluded
+
+        Page<Notification> result = notificationRepository
+                .findByRecipientIdAndTypeOrderByCreatedAtDesc(
+                        userA.getId(), NotificationType.MENTION, Pageable.ofSize(10));
+
+        assertThat(result.getContent()).hasSize(2);
+        assertThat(result.getContent()).allMatch(n -> n.getType() == NotificationType.MENTION);
+        assertThat(result.getContent()).allMatch(n -> n.getRecipient().getId().equals(userA.getId()));
+    }
+
     // ─── helpers ─────────────────────────────────────────────────────────────
 
     private Notification mention(AppUser recipient, boolean read) {

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

@@ -386,6 +386,21 @@ class NotificationServiceTest {
         verify(notificationRepository, never()).findByRecipientIdOrderByCreatedAtDesc(any(), any());
     }
 
+    @Test
+    void getNotifications_withTypeOnly_usesTypeFilteredRepoMethod() {
+        when(notificationRepository.findByRecipientIdAndTypeOrderByCreatedAtDesc(
+                eq(userA.getId()), eq(NotificationType.MENTION), any()))
+                .thenReturn(Page.empty());
+
+        notificationService.getNotifications(userA.getId(), NotificationType.MENTION, null, Pageable.ofSize(5));
+
+        verify(notificationRepository).findByRecipientIdAndTypeOrderByCreatedAtDesc(
+                eq(userA.getId()), eq(NotificationType.MENTION), any());
+        verify(notificationRepository, never()).findByRecipientIdOrderByCreatedAtDesc(any(), any());
+        verify(notificationRepository, never())
+                .findByRecipientIdAndTypeAndReadFalseOrderByCreatedAtDesc(any(), any(), any());
+    }
+
     // ─── private helpers ──────────────────────────────────────────────────────
 
     private DocumentComment commentWithAuthor(UUID id, UUID parentId, UUID authorId, String authorName) {