feat(t224): add incremental freight sync

backend-api/internal/transport/webui/handler_test.go

@@ -959,6 +959,11 @@ func TestFreightPagesEscapeSourceDataAndCreateAsyncSync(t *testing.T) {
 		nil,
 		"",
 	)
+	if !strings.Contains(form.Body.String(), "同步至现在") ||
+		!strings.Contains(form.Body.String(), `name="created_from"`) ||
+		!strings.Contains(form.Body.String(), "尚无日期同步水位") {
+		t.Fatalf("freight import form = %s", form.Body)
+	}
 	cookie := csrfCookie(t, form)
 	idempotencyKey := hiddenValue(
 		t,
@@ -994,6 +999,102 @@ func TestFreightPagesEscapeSourceDataAndCreateAsyncSync(t *testing.T) {
 	}
 }
 
+func TestFreightDateFormSubmitsManualRange(t *testing.T) {
+	now := time.Date(2026, 7, 28, 3, 4, 5, 0, time.UTC)
+	service := &fakeFreightService{
+		fakeService: &fakeService{},
+		watermark: &FreightWatermark{
+			LastSuccessfulTo:    now,
+			LastSuccessfulRunID: testTaskID,
+			UpdatedAt:           now,
+		},
+		createResult: FreightSync{
+			ID:        testTaskID,
+			Mode:      "CREATED_RANGE",
+			Status:    "PENDING",
+			CreatedAt: now,
+		},
+	}
+	router := newTestRouter(t, service)
+	form := performRequest(t, router, http.MethodGet, "/freight/import", nil, "")
+	if !strings.Contains(form.Body.String(), "增量同步水位") ||
+		!strings.Contains(form.Body.String(), testTaskID) {
+		t.Fatalf("watermark form = %s", form.Body)
+	}
+	cookie := csrfCookie(t, form)
+	key := hiddenValue(t, form.Body.String(), "idempotency_key")
+	values := url.Values{
+		"csrf_token":      {cookie.Value},
+		"idempotency_key": {key},
+		"mode":            {"CREATED_RANGE"},
+		"created_from":    {"2026-07-22"},
+		"created_to":      {"2026-07-28"},
+	}
+	request := httptest.NewRequest(
+		http.MethodPost,
+		"/freight/import",
+		strings.NewReader(values.Encode()),
+	)
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	request.AddCookie(cookie)
+	response := httptest.NewRecorder()
+	router.ServeHTTP(response, request)
+
+	if response.Code != http.StatusSeeOther ||
+		service.createInput.Mode != "CREATED_RANGE" ||
+		service.createInput.CreatedFrom != "2026-07-22" ||
+		service.createInput.CreatedTo != "2026-07-28" {
+		t.Fatalf(
+			"date form response/input = %d / %+v",
+			response.Code,
+			service.createInput,
+		)
+	}
+}
+
+func TestFreightSyncToNowIgnoresPrefilledManualDates(t *testing.T) {
+	service := &fakeFreightService{
+		fakeService: &fakeService{},
+		createResult: FreightSync{
+			ID:     testTaskID,
+			Mode:   "CREATED_RANGE",
+			Status: "PENDING",
+		},
+	}
+	router := newTestRouter(t, service)
+	form := performRequest(t, router, http.MethodGet, "/freight/import", nil, "")
+	cookie := csrfCookie(t, form)
+	key := hiddenValue(t, form.Body.String(), "idempotency_key")
+	values := url.Values{
+		"csrf_token":      {cookie.Value},
+		"idempotency_key": {key},
+		"mode":            {"CREATED_RANGE"},
+		"created_from":    {"2026-07-22"},
+		"created_to":      {"2026-07-28"},
+		"sync_to_now":     {"true"},
+	}
+	request := httptest.NewRequest(
+		http.MethodPost,
+		"/freight/import",
+		strings.NewReader(values.Encode()),
+	)
+	request.Header.Set("Content-Type", "application/x-www-form-urlencoded")
+	request.AddCookie(cookie)
+	response := httptest.NewRecorder()
+	router.ServeHTTP(response, request)
+
+	if response.Code != http.StatusSeeOther ||
+		!service.createInput.SyncToNow ||
+		service.createInput.CreatedFrom != "" ||
+		service.createInput.CreatedTo != "" {
+		t.Fatalf(
+			"sync-to-now response/input = %d / %+v",
+			response.Code,
+			service.createInput,
+		)
+	}
+}
+
 func TestFreightDetailCreatesProcurementTaskWithCSRF(t *testing.T) {
 	const itemID = "00000000-0000-4000-8000-000000000002"
 	service := &fakeProcurementService{
@@ -1101,6 +1202,7 @@ type fakeFreightService struct {
 	sync         FreightSync
 	createInput  CreateFreightSyncInput
 	createResult FreightSync
+	watermark    *FreightWatermark
 	err          error
 }
 
@@ -1159,6 +1261,12 @@ func (service *fakeFreightService) GetFreightSync(
 	return service.sync, service.err
 }
 
+func (service *fakeFreightService) GetFreightWatermark(
+	context.Context,
+) (*FreightWatermark, error) {
+	return service.watermark, service.err
+}
+
 func (service *fakeFreightService) CreateFreightSync(
 	_ context.Context,
 	input CreateFreightSyncInput,