feat：修复下载数据集问题、删除数据确认框、修改标题、添加列表轮询刷新 (#16)

* refactor: clean up tag management and dataset handling, update API endpoints

* feat: add showTime prop to DevelopmentInProgress component across multiple pages

* refactor: update component styles and improve layout with new utility classes

* feat: enhance useFetchData hook with polling functionality and improve task progress tracking

* feat: enhance dataset management features with improved tag handling, download functionality, and UI updates

* feat: Enhance DatasetDetail component with delete functionality and improved download handling

feat: Add automatic data refresh and improved user feedback in DatasetManagementPage

fix: Update dataset API to streamline download functionality and improve error handling

* feat: Clear new tag input after successful addition in TagManager

Author: chenghh-9609

frontend/src/components/ActionDropdown.tsx

@@ -0,0 +1,115 @@
+import { Dropdown, Popconfirm, Button, Space } from "antd";
+import { EllipsisOutlined } from "@ant-design/icons";
+import { useState } from "react";
+
+interface ActionItem {
+  key: string;
+  label: string;
+  icon?: React.ReactNode;
+  danger?: boolean;
+  confirm?: {
+    title: string;
+    description?: string;
+    okText?: string;
+    cancelText?: string;
+  };
+}
+
+interface ActionDropdownProps {
+  actions?: ActionItem[];
+  onAction?: (key: string, action: ActionItem) => void;
+  placement?:
+    | "bottomRight"
+    | "topLeft"
+    | "topCenter"
+    | "topRight"
+    | "bottomLeft"
+    | "bottomCenter"
+    | "top"
+    | "bottom";
+}
+
+const ActionDropdown = ({
+  actions = [],
+  onAction,
+  placement = "bottomRight",
+}: ActionDropdownProps) => {
+  const [open, setOpen] = useState(false);
+  const handleActionClick = (action: ActionItem) => {
+    if (action.confirm) {
+      // 如果有确认框，不立即执行，等待确认
+      return;
+    }
+    // 执行操作
+    onAction?.(action.key, action);
+    // 如果没有确认框，则立即关闭 Dropdown
+    setOpen(false);
+  };
+
+  const dropdownContent = (
+    <div className="bg-white p-2 rounded shadow-md">
+      <Space direction="vertical" className="w-full">
+        {actions.map((action) => {
+          if (action.confirm) {
+            return (
+              <Popconfirm
+                key={action.key}
+                title={action.confirm.title}
+                description={action.confirm.description}
+                onConfirm={() => {
+                  onAction?.(action.key, action);
+                  setOpen(false);
+                }}
+                okText={action.confirm.okText || "确定"}
+                cancelText={action.confirm.cancelText || "取消"}
+                okType={action.danger ? "danger" : "primary"}
+                styles={{ root: { zIndex: 9999 } }}
+              >
+                <Button
+                  type="text"
+                  size="small"
+                  className="w-full text-left"
+                  danger={action.danger}
+                  icon={action.icon}
+                >
+                  {action.label}
+                </Button>
+              </Popconfirm>
+            );
+          }
+
+          return (
+            <Button
+              key={action.key}
+              className="w-full"
+              size="small"
+              type="text"
+              danger={action.danger}
+              icon={action.icon}
+              onClick={() => handleActionClick(action)}
+            >
+              {action.label}
+            </Button>
+          );
+        })}
+      </Space>
+    </div>
+  );
+
+  return (
+    <Dropdown
+      overlay={dropdownContent}
+      trigger={["click"]}
+      placement={placement}
+      open={open}
+      onOpenChange={setOpen}
+    >
+      <Button
+        type="text"
+        icon={<EllipsisOutlined style={{ fontSize: 24 }} />}
+      />
+    </Dropdown>
+  );
+};
+
+export default ActionDropdown;

frontend/src/components/AddTagPopover.tsx

@@ -1,4 +1,4 @@
-import { Button, Input, Popover, theme, Tag } from "antd";
+import { Button, Input, Popover, theme, Tag, Empty } from "antd";
 import { PlusOutlined } from "@ant-design/icons";
 import { useEffect, useMemo, useState } from "react";
 
@@ -64,30 +64,35 @@ export default function AddTagPopover({
         open={showPopover}
         trigger="click"
         placement="bottom"
+        onOpenChange={setShowPopover}
         content={
           <div className="space-y-4 w-[300px]">
             <h4 className="font-medium border-b pb-2 border-gray-100">
               添加标签
             </h4>
             {/* Available Tags */}
-            <div className="space-y-2">
-              <h5 className="text-sm">选择现有标签</h5>
-              <div className="max-h-32 overflow-y-auto space-y-1">
-                {availableTags.map((tag) => (
-                  <span
-                    key={tag.id}
-                    className="h-7 w-full justify-start text-xs cursor-pointer flex items-center px-2 rounded hover:bg-gray-100"
-                    onClick={() => {
-                      onAddTag?.(tag.name);
-                      setShowPopover(false);
-                    }}
-                  >
-                    <PlusOutlined className="w-3 h-3 mr-1" />
-                    {tag.name}
-                  </span>
-                ))}
+            {availableTags?.length ? (
+              <div className="space-y-2">
+                <h5 className="text-sm">选择现有标签</h5>
+                <div className="max-h-32 overflow-y-auto space-y-1">
+                  {availableTags.map((tag) => (
+                    <span
+                      key={tag.id}
+                      className="h-7 w-full justify-start text-xs cursor-pointer flex items-center px-2 rounded hover:bg-gray-100"
+                      onClick={() => {
+                        onAddTag?.(tag.name);
+                        setShowPopover(false);
+                      }}
+                    >
+                      <PlusOutlined className="w-3 h-3 mr-1" />
+                      {tag.name}
+                    </span>
+                  ))}
+                </div>
               </div>
-            </div>
+            ) : (
+              <Empty description="没有可用标签，请先创建标签。" />
+            )}
 
             {/* Create New Tag */}
             <div className="space-y-2 border-t border-gray-100 pt-3">