refactor(output): share the JSON, created-resource and batch tails

Mutations end with a.jsonResult or a.created instead of hand-rolled
--json branches, the two identical jsonResult/writeMutationJSON helpers
become one, and writeBatchJSON checks --json itself so batch commands
share one tail.

Signed-off-by: bircni <bircni@icloud.com>

internal/app/pull_edit.go

@@ -125,10 +125,7 @@ pull request, or mark it as a draft or ready for review.`, Annotations: pullArgu
 			return err
 		}
 		a.done(cmd, "Edited pull request %s", refLabel(t.Repo, n, item.Title))
-		if a.options.json != "" {
-			return a.writeJSON(cmd, item)
-		}
-		return nil
+		return a.jsonResult(cmd, item)
 	}}
 	cmd.Flags().StringVarP(&title, "title", "t", "", "Pull request title")
 	cmd.Flags().StringVar(&deadline, "deadline", "", "Due date: YYYY-MM-DD, RFC3339, or Unix timestamp; empty clears")
@@ -206,10 +203,7 @@ removes or adds that marker.`, Annotations: pullArgumentsAnnotation(nil), Args:
 				a.done(cmd, "Marked pull request %s as ready for review", refLabel(t.Repo, n, item.Title))
 			}
 		}
-		if a.options.json != "" {
-			return a.writeJSON(cmd, item)
-		}
-		return nil
+		return a.jsonResult(cmd, item)
 	}}
 	cmd.Flags().BoolVar(&undo, "undo", false, "Turn the pull request back into a draft")
 	cmd.ValidArgsFunction = a.completePulls("open")