fix: use soDate instead of deliveryDate for Delivery Order rows in marketing export

In the Excel export, Delivery Order rows were writing `group.DeliveryDate`
(the actual delivery date) to column B ("Tanggal"), while the web UI always
shows `so_date` for every row. This caused a visible mismatch — e.g. DO-01954
displayed "31 Mei 2026" on the web but "01-06-2026" in the exported file.

Changes:
- Remove the `doDate` variable from the DO branch; both the empty-deliveries
  fallback row and each per-delivery row now write `soDate` to column B,
  consistent with what the web shows
- Fix a pre-existing nil pointer dereference: `prod.ProductWarehouse.Warehouse`
  was accessed without a nil guard in the SO branch
- Update the export test to match the current 17-column layout (headers and
  row assertions were stale), and add a regression case that explicitly
  asserts a DO row with soDate=2026-05-31 / deliveryDate=2026-06-01 produces
  "31-05-2026" in column B

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/modules/marketing/controllers/deliveryorder.export.go

@@ -201,11 +201,6 @@ func setMarketingExportRows(file *excelize.File, sheet string, items []dto.Marke
 			for _, group := range item.DeliveryOrder {
 				doNumber := safeMarketingExportText(group.DoNumber)
 
-				doDate := "-"
-				if group.DeliveryDate != nil {
-					doDate = formatMarketingExportDate(*group.DeliveryDate)
-				}
-
 				gudang := "-"
 				if group.Warehouse != nil {
 					gudang = safeMarketingExportText(group.Warehouse.Name)
@@ -215,7 +210,7 @@ func setMarketingExportRows(file *excelize.File, sheet string, items []dto.Marke
 					row++
 					r := strconv.Itoa(row)
 					vals := map[string]interface{}{
-						"A": doNumber, "B": doDate, "C": status, "D": customer, "E": salesPerson,
+						"A": doNumber, "B": soDate, "C": status, "D": customer, "E": salesPerson,
 						"F": "-", "G": "-", "H": gudang, "I": "-", "J": "-", "K": "-",
 						"L": "-", "M": "-", "N": "-", "O": "-",
 						"P": grandTotal, "Q": notes,
@@ -251,7 +246,7 @@ func setMarketingExportRows(file *excelize.File, sheet string, items []dto.Marke
 					if err := file.SetCellValue(sheet, "A"+r, doNumber); err != nil {
 						return err
 					}
-					if err := file.SetCellValue(sheet, "B"+r, doDate); err != nil {
+					if err := file.SetCellValue(sheet, "B"+r, soDate); err != nil {
 						return err
 					}
 					if err := file.SetCellValue(sheet, "C"+r, status); err != nil {
@@ -347,7 +342,7 @@ func setMarketingExportRows(file *excelize.File, sheet string, items []dto.Marke
 			}
 
 			gudang := "-"
-			if prod.ProductWarehouse != nil {
+			if prod.ProductWarehouse != nil && prod.ProductWarehouse.Warehouse != nil {
 				gudang = safeMarketingExportText(prod.ProductWarehouse.Warehouse.Name)
 			}
 

internal/modules/marketing/controllers/deliveryorder.export_test.go

@@ -15,6 +15,10 @@ import (
 )
 
 func TestBuildMarketingExportWorkbookHeadersAndRows(t *testing.T) {
+	// DO item has soDate=2026-05-31 and deliveryDate=2026-06-01 to verify
+	// the export uses soDate (not deliveryDate) in column B.
+	deliveryDate := time.Date(2026, time.June, 1, 0, 0, 0, 0, time.UTC)
+
 	items := []dto.MarketingListDTO{
 		{
 			MarketingRelationDTO: dto.MarketingRelationDTO{
@@ -51,6 +55,22 @@ func TestBuildMarketingExportWorkbookHeadersAndRows(t *testing.T) {
 				Action:   strPtr("REJECTED"),
 			},
 		},
+		{
+			MarketingRelationDTO: dto.MarketingRelationDTO{
+				SoNumber: "SO-00760",
+				SoDate:   time.Date(2026, time.May, 31, 0, 0, 0, 0, time.UTC),
+			},
+			Customer: customerDTO.CustomerRelationDTO{Name: "CORDELA"},
+			DeliveryOrder: []dto.DeliveryGroupDTO{
+				{
+					DoNumber:     "DO-01954",
+					DeliveryDate: &deliveryDate,
+				},
+			},
+			LatestApproval: approvalDTO.ApprovalRelationDTO{
+				StepName: "Delivery Order",
+			},
+		},
 	}
 
 	content, err := buildMarketingExportWorkbook(items)
@@ -69,9 +89,10 @@ func TestBuildMarketingExportWorkbookHeadersAndRows(t *testing.T) {
 		"B1": "Tanggal",
 		"C1": "Status",
 		"D1": "Customer",
-		"E1": "Grand Total",
+		"E1": "Sales",
-		"F1": "Products",
+		"G1": "Nama Produk",
-		"G1": "Notes",
+		"P1": "Grand Total",
+		"Q1": "Catatan",
 	}
 	for cell, expected := range expectedHeaders {
 		got, err := file.GetCellValue(marketingExportSheetName, cell)
@@ -83,19 +104,25 @@ func TestBuildMarketingExportWorkbookHeadersAndRows(t *testing.T) {
 		}
 	}
 
+	// SO-00762: 3 products → rows 2, 3, 4
 	assertCellEquals(t, file, "A2", "SO-00762")
 	assertCellEquals(t, file, "B2", "22-04-2026")
 	assertCellEquals(t, file, "C2", "Pengajuan")
 	assertCellEquals(t, file, "D2", "AJAT")
-	assertCellEquals(t, file, "E2", "Rp 5.206.200.000")
+	assertCellEquals(t, file, "G2", "PAKAN GROWING CRUMBLE 8603 MALINDO")
-	assertCellEquals(t, file, "F2", "PAKAN GROWING CRUMBLE 8603 MALINDO, 295 GOLD PELLET")
+	assertCellEquals(t, file, "Q2", "tes")
-	assertCellEquals(t, file, "G2", "tes")
 
-	assertCellEquals(t, file, "A3", "SO-00761")
+	// SO-00761 (rejected): 1 product → row 5
-	assertCellEquals(t, file, "C3", "Ditolak")
+	assertCellEquals(t, file, "A5", "SO-00761")
-	assertCellEquals(t, file, "E3", "Rp 75.000")
+	assertCellEquals(t, file, "C5", "Ditolak")
-	assertCellEquals(t, file, "F3", "HS30 FOAM @20 LITER")
+	assertCellEquals(t, file, "G5", "HS30 FOAM @20 LITER")
-	assertCellEquals(t, file, "G3", "-")
+	assertCellEquals(t, file, "Q5", "-")
+
+	// DO-01954: column B must use soDate (31-05-2026), not deliveryDate (01-06-2026)
+	assertCellEquals(t, file, "A6", "DO-01954")
+	assertCellEquals(t, file, "B6", "31-05-2026")
+	assertCellEquals(t, file, "C6", "Delivery Order")
+	assertCellEquals(t, file, "D6", "CORDELA")
 }
 
 func assertCellEquals(t *testing.T, file *excelize.File, cell, expected string) {