feat: 添加“返回顶部”组件，提升用户导航体验

src/components/layout/BlogNavigation.astro

@@ -64,8 +64,8 @@ const sortedPosts = posts
 
 const currentIndex = sortedPosts.findIndex((post) => post.slug === currentSlug);
 
-const nextPost = currentIndex > 0 ? sortedPosts[currentIndex - 1] : null;
+const nextPost = currentIndex < sortedPosts.length - 1 ? sortedPosts[currentIndex + 1] : null;
-const prevPost = currentIndex < sortedPosts.length - 1 ? sortedPosts[currentIndex + 1] : null;
+const prevPost = currentIndex > 0 ? sortedPosts[currentIndex - 1] : null;
 
 const prevText = lang === 'zh' ? '上一篇' : 'Previous Post';
 const nextText = lang === 'zh' ? '下一篇' : 'Next Post';

src/components/ui/back-to-top.tsx

@@ -0,0 +1,46 @@
+import { ArrowUp } from "lucide-react";
+import { Button } from "./button";
+import { useEffect, useState } from "react";
+
+export default function BackToTop() {
+  const [isVisible, setIsVisible] = useState(false);
+
+  useEffect(() => {
+    const toggleVisibility = () => {
+      if (window.scrollY > 300) {
+        setIsVisible(true);
+      } else {
+        setIsVisible(false);
+      }
+    };
+
+    window.addEventListener("scroll", toggleVisibility);
+    return () => window.removeEventListener("scroll", toggleVisibility);
+  }, []);
+
+  const scrollToTop = () => {
+    window.scrollTo({
+      top: 0,
+      behavior: "smooth",
+    });
+  };
+
+  return (
+    <div
+      className={`fixed bottom-8 right-8 z-50 transition-all duration-300 ${
+        isVisible
+          ? "translate-y-0 opacity-100"
+          : "translate-y-4 opacity-0 pointer-events-none"
+      }`}
+    >
+      <Button
+        size="icon"
+        onClick={scrollToTop}
+        className="rounded-full shadow-lg bg-primary/90 backdrop-blur-sm border border-border/50 hover:bg-primary hover:shadow-xl hover:-translate-y-1 transition-all h-10 w-10"
+      >
+        <ArrowUp className="h-5 w-5 text-primary-foreground" />
+        <span className="sr-only">Back to top</span>
+      </Button>
+    </div>
+  );
+}

src/i18n/translations.ts

@@ -49,6 +49,7 @@ export const translations = {
     },
     blog: {
       slogan: 'This is where innovative thinking meets complex problems.',
+      backToList: 'Back to Blog',
     },
     services: {
       title: 'What I Do',
@@ -105,6 +106,7 @@ export const translations = {
     },
     blog: {
       slogan: '这里是创新思维与复杂问题相遇的地方。',
+      backToList: '返回博客列表',
     },
     services: {
       title: '我能做什么',

src/layouts/BlogPostLayout.astro

@@ -4,6 +4,7 @@ import type { MarkdownLayoutProps } from 'astro';
 import { type Lang } from '@/types/i18n';
 import { type FrontmatterProps } from '@/types';
 import { defaultLang } from '@/i18n/ui';
+import { useTranslations } from '@/i18n/utils';
 import GlassHeader from '@/components/GlassHeader';
 import Footer from '@/components/Footer';
 import AuthorCard from '@/components/AuthorCard';
@@ -31,6 +32,9 @@ const {
 } = frontmatter;
 
 const lang = Astro.currentLocale as Lang || defaultLang;
+const t = useTranslations(lang);
+
+const blogListUrl = lang === 'zh' ? '/zh/blog' : '/blog';
 
 // Handle different field names for backward compatibility
 const finalPublishDate = publishDate || date;
@@ -51,6 +55,23 @@ const finalReadingTime = readTime ? parseInt(readTime.replace(/\D/g, '')) : unde
           
             <!-- Blog post header -->
             <header class="mb-10">
+              <a 
+                href={blogListUrl}
+                class="inline-flex items-center gap-2 text-sm text-muted-foreground hover:text-primary transition-colors duration-200 mb-6 group"
+              >
+                <svg 
+                  width="16" 
+                  height="16" 
+                  viewBox="0 0 15 15" 
+                  fill="none" 
+                  xmlns="http://www.w3.org/2000/svg"
+                  class="group-hover:-translate-x-1 transition-transform duration-200"
+                >
+                  <path d="M6.85355 3.85355C7.04882 3.65829 7.04882 3.34171 6.85355 3.14645C6.65829 2.95118 6.34171 2.95118 6.14645 3.14645L2.14645 7.14645C1.95118 7.34171 1.95118 7.65829 2.14645 7.85355L6.14645 11.8536C6.34171 12.0488 6.65829 12.0488 6.85355 11.8536C7.04882 11.6583 7.04882 11.3417 6.85355 11.1464L3.20711 7.5L6.85355 3.85355Z" fill="currentColor" fill-rule="evenodd" clip-rule="evenodd"></path>
+                </svg>
+                {t('blog.backToList')}
+              </a>
+              
               <PostMeta 
                 lang={lang}
                 publishDate={finalPublishDate}

src/layouts/Layout.astro

@@ -1,4 +1,5 @@
 ---
+import BackToTop from "@/components/ui/back-to-top";
 import { useTranslations } from "@/i18n/utils";
 import type { Lang } from "@/types/i18n";
 import { defaultLang } from "@/i18n/ui";
@@ -44,6 +45,7 @@ const t = useTranslations(lang);
     >
     </div>
     <slot />
+    <BackToTop client:load />
   </body>
 </html>