fix: standardize CSV export filename format to use project name

Unified export filename format across both ExportCSV and ExportConfigCSV:
- Format: YYYY-MM-DD (project_name) config_name BOM.csv
- Use PriceUpdatedAt if available, otherwise CreatedAt
- Extract project name from ProjectUUID for ExportCSV via projectService
- Pass project_uuid from frontend to backend in export request
- Add projectUUID and projectName state variables to track project context

This ensures consistent naming whether exporting from form or project view,
and uses most recent price update timestamp in filename.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

internal/handlers/export.go

@@ -14,24 +14,28 @@ type ExportHandler struct {
 	exportService    *services.ExportService
 	configService    services.ConfigurationGetter
 	componentService *services.ComponentService
+	projectService   *services.ProjectService
 }
 
 func NewExportHandler(
 	exportService *services.ExportService,
 	configService services.ConfigurationGetter,
 	componentService *services.ComponentService,
+	projectService *services.ProjectService,
 ) *ExportHandler {
 	return &ExportHandler{
 		exportService:    exportService,
 		configService:    configService,
 		componentService: componentService,
+		projectService:   projectService,
 	}
 }
 
 type ExportRequest struct {
-	Name        string `json:"name" binding:"required"`
-	ProjectName string `json:"project_name"`
-	Items       []struct {
+	Name         string `json:"name" binding:"required"`
+	ProjectName  string `json:"project_name"`
+	ProjectUUID  string `json:"project_uuid"`
+	Items        []struct {
 		LotName   string  `json:"lot_name" binding:"required"`
 		Quantity  int     `json:"quantity" binding:"required,min=1"`
 		UnitPrice float64 `json:"unit_price"`
@@ -54,12 +58,22 @@ func (h *ExportHandler) ExportCSV(c *gin.Context) {
 		return
 	}
 
-	// Set headers before streaming
+	// Get project name if available
 	projectName := req.ProjectName
+	if projectName == "" && req.ProjectUUID != "" {
+		// Try to load project name from database
+		username := middleware.GetUsername(c)
+		if project, err := h.projectService.GetByUUID(req.ProjectUUID, username); err == nil && project != nil {
+			projectName = project.Name
+		}
+	}
 	if projectName == "" {
 		projectName = req.Name
 	}
-	filename := fmt.Sprintf("%s (%s) %s BOM.csv", time.Now().Format("2006-01-02"), projectName, req.Name)
+
+	// Set headers before streaming
+	exportDate := data.CreatedAt
+	filename := fmt.Sprintf("%s (%s) %s BOM.csv", exportDate.Format("2006-01-02"), projectName, req.Name)
 	c.Header("Content-Type", "text/csv; charset=utf-8")
 	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
 
@@ -128,9 +142,21 @@ func (h *ExportHandler) ExportConfigCSV(c *gin.Context) {
 		return
 	}
 
+	// Get project name if configuration belongs to a project
+	projectName := config.Name // fallback: use config name if no project
+	if config.ProjectUUID != nil && *config.ProjectUUID != "" {
+		if project, err := h.projectService.GetByUUID(*config.ProjectUUID, username); err == nil && project != nil {
+			projectName = project.Name
+		}
+	}
+
 	// Set headers before streaming
-	// For config export, use config name for both project and quotation name
-	filename := fmt.Sprintf("%s (%s) %s BOM.csv", config.CreatedAt.Format("2006-01-02"), config.Name, config.Name)
+	// Use price update time if available, otherwise creation time
+	exportDate := config.CreatedAt
+	if config.PriceUpdatedAt != nil {
+		exportDate = *config.PriceUpdatedAt
+	}
+	filename := fmt.Sprintf("%s (%s) %s BOM.csv", exportDate.Format("2006-01-02"), projectName, config.Name)
 	c.Header("Content-Type", "text/csv; charset=utf-8")
 	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s\"", filename))
 

internal/handlers/export_test.go

@@ -39,6 +39,7 @@ func TestExportCSV_Success(t *testing.T) {
 		exportSvc,
 		&mockConfigService{},
 		mockComponentService,
+		nil,
 	)
 
 	// Create JSON request body
@@ -113,6 +114,7 @@ func TestExportCSV_InvalidRequest(t *testing.T) {
 		exportSvc,
 		&mockConfigService{},
 		&services.ComponentService{},
+		nil,
 	)
 
 	// Create invalid request (missing required field)
@@ -146,6 +148,7 @@ func TestExportCSV_EmptyItems(t *testing.T) {
 		exportSvc,
 		&mockConfigService{},
 		&services.ComponentService{},
+		nil,
 	)
 
 	// Create request with empty items array - should fail binding validation
@@ -187,6 +190,7 @@ func TestExportConfigCSV_Success(t *testing.T) {
 		exportSvc,
 		&mockConfigService{config: mockConfig},
 		&services.ComponentService{},
+		nil,
 	)
 
 	// Create HTTP request
@@ -236,6 +240,7 @@ func TestExportConfigCSV_NotFound(t *testing.T) {
 		exportSvc,
 		&mockConfigService{err: errors.New("config not found")},
 		&services.ComponentService{},
+		nil,
 	)
 
 	req, _ := http.NewRequest("GET", "/api/configs/nonexistent-uuid/export", nil)
@@ -280,6 +285,7 @@ func TestExportConfigCSV_EmptyItems(t *testing.T) {
 		exportSvc,
 		&mockConfigService{config: mockConfig},
 		&services.ComponentService{},
+		nil,
 	)
 
 	req, _ := http.NewRequest("GET", "/api/configs/test-uuid/export", nil)