Add animated mesh gradient hero with overlay content

- Add @paper-design/shaders for WebGL mesh gradient effect
- Create hero-shader.js with liquid ink gradient (grayscale palette)
- Add overlay content: title, tagline, and CTA on shader
- Update hero section structure and styling
- Fix accessibility: gallery dot buttons, toggle ARIA attributes
- Fix undefined --color-terracotta CSS variable
- Update distribution structure for Codex/Cursor skills

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

package.json

@@ -27,6 +27,7 @@
     "bun-plugin-tailwind": "^0.1.2"
   },
   "dependencies": {
+    "@paper-design/shaders": "^0.0.68",
     "lenis": "^1.3.16",
     "motion": "^12.23.26",
     "tailwindcss": "^4.1.18",