Clarify transfer rejections and improve storage readability

apps/server/test/phase1.test.ts

@@ -339,6 +339,11 @@ test('거절, 만료, 취소 후 확정 금지와 거절 재요청 제한', asyn
       ).statusCode,
       409,
     );
+    for (let i = 0; i < 2; i++) {
+      const next = await f.request(a, b);
+      assert.equal(next.statusCode, 200);
+      await f.call(b, `/transfer-requests/${next.json().requestId}/reject`, 'POST', {});
+    }
     assert.equal((await f.request(a, b)).statusCode, 429);
     const c = await f.create();
     await f.space(a, c);