feat(Dashboard): 重构仪表板功能组件和逻辑

- 新增 dashboardFeatures.ts 和 useDashboard.ts 文件，封装仪表板功能的解析和状态管理逻辑。
- 更新 Dashboard 组件，使用 useDashboard 钩子简化可见工具和最近使用工具的处理。
- 添加仪表板功能的单元测试，确保功能正确性。
- 更新 README.md，移除不再使用的 ToolCard 组件说明。

src/pages/Dashboard/__tests__/index.test.tsx

@@ -0,0 +1,100 @@
+import { render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { getFeatureByKey } from '@/config/features';
+import type { DashboardFeatureItem } from '../useDashboard';
+import Index from '../index';
+
+const mockNavigateTo = vi.fn();
+const mockUseDashboard = vi.fn();
+
+vi.mock('../useDashboard', () => ({
+  useDashboard: () => mockUseDashboard(),
+}));
+
+function buildFeatureItem(key: 'timestamp' | 'jwt'): DashboardFeatureItem {
+  const feature = getFeatureByKey(key)!;
+  return {
+    key,
+    feature: feature as DashboardFeatureItem['feature'],
+  };
+}
+
+describe('Dashboard 页面', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+    mockUseDashboard.mockReturnValue({
+      visibleFeatures: [buildFeatureItem('timestamp'), buildFeatureItem('jwt')],
+      recentFeatures: [],
+      showRecent: false,
+      navigateTo: mockNavigateTo,
+    });
+  });
+
+  it('应渲染全部工具网格', () => {
+    render(<Index />);
+
+    expect(screen.getByText('全部工具')).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: '时间戳' })).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'JWT 解析' })).toBeInTheDocument();
+  });
+
+  it('点击工具卡片应触发 navigateTo', async () => {
+    const user = userEvent.setup();
+    render(<Index />);
+
+    await user.click(screen.getByRole('button', { name: '时间戳' }));
+
+    expect(mockNavigateTo).toHaveBeenCalledTimes(1);
+    expect(mockNavigateTo).toHaveBeenCalledWith('timestamp');
+  });
+
+  it('有最近使用数据时应显示最近使用区块', () => {
+    mockUseDashboard.mockReturnValue({
+      visibleFeatures: [buildFeatureItem('timestamp')],
+      recentFeatures: [buildFeatureItem('jwt')],
+      showRecent: true,
+      navigateTo: mockNavigateTo,
+    });
+
+    render(<Index />);
+
+    expect(screen.getByText('最近使用')).toBeInTheDocument();
+    expect(screen.getByRole('button', { name: 'JWT 解析' })).toBeInTheDocument();
+  });
+
+  it('无最近使用数据时不应显示最近使用区块', () => {
+    render(<Index />);
+
+    expect(screen.queryByText('最近使用')).not.toBeInTheDocument();
+  });
+
+  it('点击最近使用按钮应触发 navigateTo', async () => {
+    const user = userEvent.setup();
+    mockUseDashboard.mockReturnValue({
+      visibleFeatures: [buildFeatureItem('timestamp')],
+      recentFeatures: [buildFeatureItem('jwt')],
+      showRecent: true,
+      navigateTo: mockNavigateTo,
+    });
+
+    render(<Index />);
+
+    await user.click(screen.getByRole('button', { name: 'JWT 解析' }));
+
+    expect(mockNavigateTo).toHaveBeenCalledWith('jwt');
+  });
+
+  it('无可见工具时应显示空状态', () => {
+    mockUseDashboard.mockReturnValue({
+      visibleFeatures: [],
+      recentFeatures: [],
+      showRecent: false,
+      navigateTo: mockNavigateTo,
+    });
+
+    render(<Index />);
+
+    expect(screen.getByText('没有可用的工具')).toBeInTheDocument();
+  });
+});