feat: add GitHub projects page

Co-authored-by: Cursor <cursoragent@cursor.com>

lib/github.ts

@@ -0,0 +1,74 @@
+export type RepoSummary = {
+  id: number;
+  name: string;
+  fullName: string;
+  htmlUrl: string;
+  description: string | null;
+  language: string | null;
+  stargazersCount: number;
+  updatedAt: string;
+};
+
+const GITHUB_API_BASE = 'https://api.github.com';
+
+function getGithubHeaders() {
+  const headers: Record<string, string> = {
+    Accept: 'application/vnd.github+json',
+    'User-Agent': 'blog-nextjs-app',
+  };
+
+  const token = process.env.GITHUB_TOKEN;
+  if (token && token.trim() !== '') {
+    headers.Authorization = `Bearer ${token}`;
+  }
+
+  return headers;
+}
+
+/**
+ * Fetch all public repositories for the configured GitHub user.
+ * Returns an empty array on error instead of throwing, so the UI
+ * can render a graceful fallback.
+ */
+export async function fetchPublicRepos(usernameOverride?: string): Promise<RepoSummary[]> {
+  const username = usernameOverride || process.env.GITHUB_USERNAME;
+
+  if (!username) {
+    console.error('GITHUB_USERNAME is not set; cannot fetch GitHub repositories.');
+    return [];
+  }
+
+  const url = `${GITHUB_API_BASE}/users/${encodeURIComponent(
+    username
+  )}/repos?type=public&sort=updated`;
+
+  try {
+    const res = await fetch(url, {
+      headers: getGithubHeaders(),
+      // Use Next.js App Router caching / ISR
+      next: { revalidate: 3600 },
+    });
+
+    if (!res.ok) {
+      console.error('Failed to fetch GitHub repositories:', res.status, res.statusText);
+      return [];
+    }
+
+    const data = (await res.json()) as any[];
+
+    return data.map((repo) => ({
+      id: repo.id,
+      name: repo.name,
+      fullName: repo.full_name,
+      htmlUrl: repo.html_url,
+      description: repo.description,
+      language: repo.language,
+      stargazersCount: repo.stargazers_count,
+      updatedAt: repo.updated_at,
+    }));
+  } catch (error) {
+    console.error('Error while fetching GitHub repositories:', error);
+    return [];
+  }
+}
+