feat(blog): add next/previous post navigation scoped by category

Navigate between posts within the same category (regular, microblog,
archived). Newer post links left, older post links right. Includes
i18n support for English and Polish.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/src/pages/posts/[...slug].astro b/src/pages/posts/[...slug].astro
index 76e4f28..b66d911 100644
--- a/src/pages/posts/[...slug].astro
+++ b/src/pages/posts/[...slug].astro
@@ -1,24 +1,27 @@
 ---
 import { render } from "astro:content";
 import type { GetStaticPaths, InferGetStaticPropsType } from "astro";
-import { getAllPosts } from "@/data/post";
+import { getAllPosts, getPostNavigation } from "@/data/post";
 import PostLayout from "@/layouts/BlogPost.astro";
 
 // if you're using an adaptor in SSR mode, getStaticPaths wont work -> https://docs.astro.build/en/guides/routing/#modifying-the-slug-example-for-ssr
 export const getStaticPaths = (async () => {
 	const blogEntries = await getAllPosts(true); // Include archived posts for direct access
-	return blogEntries.map((post) => ({
-		params: { slug: post.id },
-		props: { post },
-	}));
+	return blogEntries.map((post) => {
+		const { prevPost, nextPost } = getPostNavigation(blogEntries, post);
+		return {
+			params: { slug: post.id },
+			props: { post, prevPost, nextPost },
+		};
+	});
 }) satisfies GetStaticPaths;
 
 type Props = InferGetStaticPropsType<typeof getStaticPaths>;
 
-const { post } = Astro.props;
+const { post, prevPost, nextPost } = Astro.props;
 const { Content } = await render(post);
 ---
 
-<PostLayout post={post}>
+<PostLayout post={post} prevPost={prevPost} nextPost={nextPost}>
 	<Content />
 </PostLayout>