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/useDashboard.ts

@@ -0,0 +1,31 @@
+import { useMemo } from 'react';
+import { useRouter } from '@/providers/RouterProvider';
+import type { PageType } from '@/types/storage';
+import { resolveDashboardFeatures, type DashboardFeatureItem } from './dashboardFeatures';
+
+export type { DashboardFeatureItem } from './dashboardFeatures';
+
+export interface UseDashboardReturn {
+  visibleFeatures: DashboardFeatureItem[];
+  recentFeatures: DashboardFeatureItem[];
+  showRecent: boolean;
+  navigateTo: (page: PageType) => void;
+}
+
+export function useDashboard(): UseDashboardReturn {
+  const { navigateTo, visiblePages, pageOrder, recentlyUsedTools } = useRouter();
+
+  const visibleFeatures = useMemo(
+    () => resolveDashboardFeatures(pageOrder, visiblePages),
+    [pageOrder, visiblePages],
+  );
+
+  const recentFeatures = useMemo(
+    () => resolveDashboardFeatures(recentlyUsedTools, visiblePages),
+    [recentlyUsedTools, visiblePages],
+  );
+
+  const showRecent = recentFeatures.length > 0;
+
+  return { visibleFeatures, recentFeatures, showRecent, navigateTo };
+}