AI 接入 V1.0

UI更新

lib/pages/bill/widgets/bill_group_card.dart

@@ -4,6 +4,7 @@ import '../../../models/bill.dart';
 import '../../../utils/amount_util.dart';
 import '../../../utils/bill_grouping.dart';
 import '../../../utils/date_util.dart';
+import '../../../widgets/cute_icon.dart';
 
 /// 单日分组卡：组头（日期 + 分开的支出/收入小计）+ 账单条目
 class BillGroupCard extends StatelessWidget {
@@ -91,7 +92,7 @@ class _BillTile extends StatelessWidget {
                 color: Color(0xFFFBEEDD),
               ),
               alignment: Alignment.center,
-              child: Text(bill.categoryIcon, style: const TextStyle(fontSize: 19)),
+              child: CuteIcon(bill.categoryIcon, size: 21),
             ),
             const SizedBox(width: 12),
             Expanded(