fix(time): use UTC methods for operation history display

The database stores time in UTC format, and the UI should display UTC
time without timezone conversion. Use getUTCXxx() methods instead of
getHours() to avoid adding 8-hour timezone offset.

Also extract common datetime formatting logic to reduce code duplication.

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

src/main/services/database/extractor-operation-history-dao.ts

@@ -21,6 +21,17 @@ import type {
 
 const log = createLogger('ExtractorOperationHistoryDAO')
 
+/**
+ * Format datetime value from database to ISO string
+ * mssql driver returns Date objects in UTC format
+ */
+function formatDateTime(value: unknown): string {
+  if (value instanceof Date) {
+    return value.toISOString()
+  }
+  return value ? String(value) : new Date().toISOString()
+}
+
 /**
  * Configuration for ExtractorOperationHistory table
  */
@@ -324,9 +335,7 @@ export class ExtractorOperationHistoryDAO {
         batchId: row.BatchId as string,
         userId: row.UserId as number,
         username: row.Username as string,
-        operationTime: row.OperationTime
-          ? new Date(row.OperationTime as string).toISOString()
-          : new Date().toISOString(),
+        operationTime: formatDateTime(row.OperationTime),
         status: row.Status as string,
         totalOrders: row.TotalOrders as number,
         totalRecords: (row.TotalRecords as number) || 0,
@@ -432,9 +441,7 @@ export class ExtractorOperationHistoryDAO {
         batchId: row.BatchId as string,
         userId: row.UserId as number,
         username: row.Username as string,
-        operationTime: row.OperationTime
-          ? new Date(row.OperationTime as string).toISOString()
-          : new Date().toISOString(),
+        operationTime: formatDateTime(row.OperationTime),
         status: row.Status as string,
         totalOrders: row.TotalOrders as number,
         totalRecords: (row.TotalRecords as number) || 0,