feat: 更新导航组件，添加新图标并优化布局；新增数据集和设置页面

src/routes/settings/+page.svelte

@@ -0,0 +1,8 @@
+<script lang="ts">
+import { afterNavigate } from '$app/navigation';
+import { currentActivate } from '$lib/stores/navigate';
+
+afterNavigate(() => {
+  currentActivate.set('settings');
+});
+</script>