fix(tests): raise sent/delivered poll timeout in rate-limit test to 30s

TestSendSMS_RateLimit failed intermittently in CI: fireEvent dispatches
the SENT/DELIVERED cloud event through an async loopback HTTP push
(emulatorPushQueue), and the 15s poll window was too tight under CI
load, failing right at the boundary. Other tests already poll the
'delivered' status with a 30s timeout; align this test with that
margin for both 'sent' and 'delivered' polls.

Author: AchoArnold

tests/integration_test.go

@@ -200,14 +200,14 @@ func TestSendSMS_RateLimit(t *testing.T) {
 	assert.GreaterOrEqual(t, gapMs, int64(5500), "rate limit gap should be >= 5500ms (6s minus timing tolerance), got %dms", gapMs)
 
 	fireEvent(ctx, t, phone.PhoneAPIKey, msgID1, "SENT")
-	pollMessageStatus(ctx, t, msgID1, "sent", 15*time.Second)
+	pollMessageStatus(ctx, t, msgID1, "sent", 30*time.Second)
 	fireEvent(ctx, t, phone.PhoneAPIKey, msgID2, "SENT")
-	pollMessageStatus(ctx, t, msgID2, "sent", 15*time.Second)
+	pollMessageStatus(ctx, t, msgID2, "sent", 30*time.Second)
 	fireEvent(ctx, t, phone.PhoneAPIKey, msgID1, "DELIVERED")
 	fireEvent(ctx, t, phone.PhoneAPIKey, msgID2, "DELIVERED")
 
-	msg1 := pollMessageStatus(ctx, t, msgID1, "delivered", 15*time.Second)
-	msg2 := pollMessageStatus(ctx, t, msgID2, "delivered", 15*time.Second)
+	msg1 := pollMessageStatus(ctx, t, msgID1, "delivered", 30*time.Second)
+	msg2 := pollMessageStatus(ctx, t, msgID2, "delivered", 30*time.Second)
 	assert.Equal(t, "delivered", msg1.Status)
 	assert.Equal(t, "delivered", msg2.Status)