migrate CRA to Next.js 16 + React 19 + TypeScript + Tailwind v4

- replace CRA scaffold with Next.js static export config
- add app router pages: home, homelab, archive
- add components: Nav, Footer, Hero, Skills, ProjectCard, ThemeScript
- add ThemeContext for dark mode with FOUC prevention
- add data layer: projects.ts, services.ts
- update .gitignore for Next.js (ignore .next/, out/, next-env.d.ts)
- add docs: handoff plan, homelab decisions, style reference

src/components/Footer.tsx

@@ -0,0 +1,38 @@
+export default function Footer() {
+  return (
+    <footer className="border-t border-[var(--color-grey-1)] py-8 mt-16">
+      <div className="max-w-5xl mx-auto px-6 flex flex-col sm:flex-row items-center justify-between gap-4">
+        <p className="font-mono text-xs text-[var(--color-grey-2)] tracking-widest">
+          &copy; {new Date().getFullYear()} Tyler Koenig
+        </p>
+        <div className="flex items-center gap-5">
+          <a
+            href="https://github.com/lerko96"
+            target="_blank"
+            rel="noopener noreferrer"
+            aria-label="GitHub"
+            className="text-[var(--color-grey-2)] hover:text-[var(--color-green)] transition-colors"
+          >
+            <i className="fab fa-github text-lg" aria-hidden="true" />
+          </a>
+          <a
+            href="https://www.linkedin.com/in/tyler-koenig"
+            target="_blank"
+            rel="noopener noreferrer"
+            aria-label="LinkedIn"
+            className="text-[var(--color-grey-2)] hover:text-[var(--color-green)] transition-colors"
+          >
+            <i className="fab fa-linkedin text-lg" aria-hidden="true" />
+          </a>
+          <a
+            href="mailto:tylerkoenig96@gmail.com"
+            aria-label="Email"
+            className="text-[var(--color-grey-2)] hover:text-[var(--color-green)] transition-colors"
+          >
+            <i className="fas fa-envelope text-lg" aria-hidden="true" />
+          </a>
+        </div>
+      </div>
+    </footer>
+  );
+}