refactor: 删除高优先级死代码

删除未使用的代码以提高代码质量和可维护性：

删除的文件：
- src/pages/Dashboard/ToolCard.tsx：未被使用的组件
- src/utils/useDebounce.ts：未被使用的 hook
- src/components/__tests__/ToolCard.test.tsx：对应组件的测试文件

删除的导出函数：
- chromeTabs: getActiveTab, getActiveTabDomain, ensureContentScriptInjected
- clipboard: copyImageToClipboard
- storageCleaner: isEmptyResult
- chromeI18n: preloadNamespaces
- useContextMenuData: clearContextMenuData

更新了对应的测试文件以保持一致性

总计删除 525 行代码，所有 473 个测试通过

src/components/__tests__/ToolCard.test.tsx

@@ -1,118 +0,0 @@
-import { beforeEach, describe, expect, it, vi } from 'vitest';
-import { act, fireEvent, render, screen } from '@testing-library/react';
-import userEvent from '@testing-library/user-event';
-import ToolCard from '@/pages/Dashboard/ToolCard';
-import { Clock } from 'lucide-react';
-
-describe('ToolCard 组件', () => {
-  beforeEach(() => {
-    vi.clearAllMocks();
-  });
-
-  describe('渲染测试', () => {
-    it('应渲染标题和描述', () => {
-      render(
-        <ToolCard
-          title="测试工具"
-          description="这是一个测试工具"
-          colorKey="primary"
-          icon={Clock}
-          onNavigate={() => {}}
-        />,
-      );
-
-      expect(screen.getByText('测试工具')).toBeInTheDocument();
-      expect(screen.getByText('这是一个测试工具')).toBeInTheDocument();
-    });
-
-    it('无描述时仅渲染标题', () => {
-      render(<ToolCard title="仅标题" colorKey="primary" icon={Clock} onNavigate={() => {}} />);
-
-      expect(screen.getByText('仅标题')).toBeInTheDocument();
-    });
-
-    it('应渲染图标', () => {
-      const { container } = render(
-        <ToolCard title="带图标" colorKey="primary" icon={Clock} onNavigate={() => {}} />,
-      );
-
-      const svgElement = container.querySelector('svg');
-      expect(svgElement).toBeInTheDocument();
-    });
-
-    it('提供快照内容时应渲染快照', () => {
-      render(
-        <ToolCard
-          title="带快照"
-          colorKey="primary"
-          icon={Clock}
-          onNavigate={() => {}}
-          snapshot={<div data-testid="snapshot">快照内容</div>}
-        />,
-      );
-
-      expect(screen.getByTestId('snapshot')).toBeInTheDocument();
-    });
-
-    it('未提供快照时不渲染快照区域', () => {
-      const { container } = render(
-        <ToolCard
-          title="无快照"
-          colorKey="primary"
-          icon={Clock}
-          onClick={() => {}}
-          onNavigate={function (): void {
-            throw new Error('Function not implemented.');
-          }}
-        />,
-      );
-
-      expect(container.querySelector('[data-testid="snapshot"]')).not.toBeInTheDocument();
-    });
-
-    it('应使用 CardActionArea 渲染，支持键盘聚焦', () => {
-      render(<ToolCard title="可聚焦" colorKey="primary" icon={Clock} onNavigate={() => {}} />);
-
-      const button = screen.getByRole('button', { name: /可聚焦/ });
-      expect(button).toBeInTheDocument();
-    });
-  });
-
-  describe('交互测试', () => {
-    it('点击时应调用 onClick', () => {
-      const handleClick = vi.fn();
-      render(<ToolCard title="可点击" colorKey="primary" icon={Clock} onNavigate={handleClick} />);
-
-      const button = screen.getByRole('button', { name: /可点击/ });
-      fireEvent.click(button);
-
-      expect(handleClick).toHaveBeenCalledTimes(1);
-    });
-
-    it('按 Enter 键时应调用 onClick', async () => {
-      const handleClick = vi.fn();
-      render(
-        <ToolCard title="键盘可触发" colorKey="primary" icon={Clock} onNavigate={handleClick} />,
-      );
-
-      const button = screen.getByRole('button', { name: /键盘可触发/ });
-      await act(async () => {
-        button.focus();
-        await userEvent.keyboard('{Enter}');
-      });
-
-      expect(handleClick).toHaveBeenCalledTimes(1);
-    });
-  });
-
-  describe('样式测试', () => {
-    it('应应用自定义颜色代码', () => {
-      const { container } = render(
-        <ToolCard title="自定义颜色" colorKey="warning" icon={Clock} onNavigate={() => {}} />,
-      );
-
-      const svgElement = container.querySelector('svg');
-      expect(svgElement).toBeInTheDocument();
-    });
-  });
-});