feat: 实现账户批量导出功能和界面优化

- 新增批量导出功能，支持text模式导出账户数据
- 添加导出弹窗，支持文本全选和文件下载
- 移动刷新按钮到全局位置，统一刷新账户和统计数据
- 在统计卡片中将已导出状态计入可用账户
- 创建自定义确认对话框替换系统confirm弹窗
- 统一按钮尺寸，修复刷新和上传按钮大小不一致
- 添加已导出状态的中文映射和样式

🤖 Generated with [Claude Code](https://claude.ai/code)

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

lib/hooks/use-accounts.ts

@@ -46,7 +46,7 @@ export interface UseAccountsReturn {
   handleSortChange: (field: keyof Account, order: 'asc' | 'desc') => void;
   handleSelectAll: (checked: boolean) => void;
   handleSelectOne: (id: number, checked: boolean) => void;
-  handleBatchDelete: () => Promise<void>;
+  handleBatchDelete: (showConfirm?: (options: any) => void) => Promise<void>;
   handleBatchUpdate: (payload: Partial<Pick<Account, 'status' | 'ownerId' | 'notes' | 'platform'>>, targetIds?: number[]) => Promise<void>;
   handleUploadAccounts: (accounts: ScriptUploadItem[], ownerId: string) => Promise<void>;
   setSelectedIds: (ids: number[]) => void;
@@ -160,22 +160,38 @@ export function useAccounts(): UseAccountsReturn {
   };
 
   // 批量删除
-  const handleBatchDelete = async () => {
+  const handleBatchDelete = async (showConfirm?: (options: any) => void) => {
     if (selectedIds.length === 0) return;
     
-    if (!confirm(`确认删除 ${selectedIds.length} 个账户？`)) return;
-    
-    try {
-      const response = await apiClient.batchDeleteAccounts({ ids: selectedIds });
-      if (response.code === BusinessCode.Success) {
-        setSelectedIds([]);
-        await fetchAccounts();
-        await fetchStats();
-        toast.success(`成功删除 ${response.data?.deletedCount || 0} 个账户`);
+    const executeDelete = async () => {
+      try {
+        const response = await apiClient.batchDeleteAccounts({ ids: selectedIds });
+        if (response.code === BusinessCode.Success) {
+          setSelectedIds([]);
+          await fetchAccounts();
+          await fetchStats();
+          toast.success(`成功删除 ${response.data?.deletedCount || 0} 个账户`);
+        }
+      } catch (error) {
+        console.error('Failed to delete accounts:', error);
+        toast.error('删除失败，请检查网络连接后重试');
+      }
+    };
+
+    if (showConfirm) {
+      showConfirm({
+        title: '确认删除',
+        description: `确认删除 ${selectedIds.length} 个账户？此操作不可撤销。`,
+        confirmText: '确认删除',
+        cancelText: '取消',
+        variant: 'destructive',
+        onConfirm: executeDelete
+      });
+    } else {
+      // 如果没有提供确认函数，直接执行删除（用于兼容）
+      if (confirm(`确认删除 ${selectedIds.length} 个账户？`)) {
+        await executeDelete();
       }
-    } catch (error) {
-      console.error('Failed to delete accounts:', error);
-      toast.error('删除失败，请检查网络连接后重试');
     }
   };