Build portfolio site with Next.js, Tailwind CSS, and dark mode

- Add CLAUDE.md with project conventions and architecture notes
- Create Navbar (sticky, backdrop blur, mobile menu) and Footer
- Build homepage sections: Hero, FeaturedProjects, Skills, CurrentWork, CallToAction
- Add /projects, /about, and /contact pages
- Create reusable ProjectCard and Badge components
- Centralise project data in content/projects.json with featured flag
- Add class-based dark mode toggle (default dark, persisted to localStorage)
- Refactor globals.css: remove conflicting prefers-color-scheme media query
- Fix two-instance ThemeToggle sync bug in Navbar
- Fix key={index} anti-pattern in timeline, stale closure in setOpen

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

components/ThemeToggle.tsx

@@ -0,0 +1,44 @@
+'use client'
+
+import { useState } from 'react'
+
+function isDark() {
+  if (typeof window === 'undefined') return true
+  return document.documentElement.classList.contains('dark')
+}
+
+export default function ThemeToggle() {
+  const [dark, setDark] = useState(isDark)
+
+  function toggle() {
+    const next = !dark
+    setDark(next)
+    document.documentElement.classList.toggle('dark', next)
+    try {
+      localStorage.setItem('theme', next ? 'dark' : 'light')
+    } catch {
+      // ignore
+    }
+  }
+
+  return (
+    <button
+      onClick={toggle}
+      aria-label="Toggle theme"
+      className="flex h-8 w-8 items-center justify-center rounded-sm text-zinc-500 transition-colors hover:bg-zinc-100 hover:text-zinc-900 dark:hover:bg-zinc-800 dark:hover:text-zinc-100"
+    >
+      {dark ? (
+        // Sun — switch to light
+        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+          <circle cx="12" cy="12" r="4" />
+          <path d="M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41M2 12h2M20 12h2M4.93 19.07l1.41-1.41M17.66 6.34l1.41-1.41" />
+        </svg>
+      ) : (
+        // Moon — switch to dark
+        <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round">
+          <path d="M12 3a6 6 0 0 0 9 9 9 9 0 1 1-9-9Z" />
+        </svg>
+      )}
+    </button>
+  )
+}