feat: 创建三步式快速记账表单组件，支持金额、类型、分类、账户、备注和标签等录入。

src/components/transaction/TransactionForm/TransactionForm.tsx

@@ -241,11 +241,6 @@ export const TransactionForm: React.FC<TransactionFormProps> = ({
   );
 
   // Helpers
-  const toLocalISOString = (date: Date) => {
-    const pad = (n: number) => n.toString().padStart(2, '0');
-    return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())}T${pad(date.getHours())}:${pad(date.getMinutes())}`;
-  };
-
   const selectedAccount = accounts.find((a) => a.id === formData.accountId);
   const selectedCategory = categories.find((c) => c.id === formData.categoryId);