fix: persist chapter-names results into job payload from sync SSE handler

The SSE (non-async) chapter-names handler streamed results to the client
but never wrote them into the PocketBase job payload — only the initial
{pattern} stub was stored. The Review button then fetched the job and
found no results, showing 'No results found in this job's payload.'

Fix: accumulate allResults across batches (same as the async handler) and
write the full {pattern, slug, results:[...]} payload when marking done.

backend/internal/backend/handlers_textgen.go

@@ -233,6 +233,7 @@ func (s *Server) handleAdminTextGenChapterNames(w http.ResponseWriter, r *http.R
 		}
 	}
 
+	var allResults []proposedChapterTitle
 	chaptersDone := resumeFrom
 	firstEvent := true
 	for i, batch := range batches {
@@ -287,6 +288,7 @@ func (s *Server) handleAdminTextGenChapterNames(w http.ResponseWriter, r *http.R
 				NewTitle: p.Title,
 			})
 		}
+		allResults = append(allResults, result...)
 		chaptersDone += len(batch)
 
 		if jobID != "" && s.deps.AIJobStore != nil {
@@ -310,16 +312,20 @@ func (s *Server) handleAdminTextGenChapterNames(w http.ResponseWriter, r *http.R
 		sseWrite(evt)
 	}
 
-	// Mark job as done in PB.
+	// Mark job as done in PB, persisting results so the Review button works.
 	if jobID != "" && s.deps.AIJobStore != nil {
 		status := domain.TaskStatusDone
 		if jobCtx.Err() != nil {
 			status = domain.TaskStatusCancelled
 		}
+		resultsJSON, _ := json.Marshal(allResults)
+		finalPayload := fmt.Sprintf(`{"pattern":%q,"slug":%q,"results":%s}`,
+			req.Pattern, req.Slug, string(resultsJSON))
 		_ = s.deps.AIJobStore.UpdateAIJob(r.Context(), jobID, map[string]any{
 			"status":     string(status),
 			"items_done": chaptersDone,
 			"finished":   time.Now().Format(time.RFC3339),
+			"payload":    finalPayload,
 		})
 	}