fix(reader-dashboard): recentDocs items were always undefined for READ_ALL users

The server mapped DocumentSearchResult items as { document: Document }[]
but the API returns flat DocumentListItem[] — so i.document was always
undefined, crashing the reader homepage with a 500.

Fix the type + mapping in +page.server.ts, add createdAt/updatedAt to
DocumentListItem (needed by ReaderRecentDocs for relative-time display),
and update the component to accept DocumentListItem instead of Document.

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

backend/src/main/java/org/raddatz/familienarchiv/document/DocumentListItem.java

@@ -6,6 +6,7 @@ import org.raddatz.familienarchiv.person.Person;
 import org.raddatz.familienarchiv.tag.Tag;
 
 import java.time.LocalDate;
+import java.time.LocalDateTime;
 import java.util.List;
 import java.util.UUID;
 
@@ -32,5 +33,9 @@ public record DocumentListItem(
         @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
         List<ActivityActorDTO> contributors,
         @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
-        SearchMatchData matchData
+        SearchMatchData matchData,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        LocalDateTime createdAt,
+        @Schema(requiredMode = Schema.RequiredMode.REQUIRED)
+        LocalDateTime updatedAt
 ) {}

backend/src/main/java/org/raddatz/familienarchiv/document/DocumentService.java

@@ -767,7 +767,9 @@ public class DocumentService {
                 doc.getSummary(),
                 completionPct,
                 contributors,
-                match
+                match,
+                doc.getCreatedAt(),
+                doc.getUpdatedAt()
         );
     }