Add CardNav, theme providers, and UI updates

Introduce an interactive top navigation and theming + site UI/branding changes.

- Add CardNav component (TSX + CSS) with GSAP animations and responsive behavior.
- Dynamic Header now loads CardNav (client-side).
- Add Providers (next-themes) and wrap RootLayout; enable theme toggle and update site title to "Koring Team".
- Add Koring logo component and public SVG asset.
- Add custom 404 (app/not-found.tsx).
- Update home page spacing and card paddings for responsiveness.
- Refactor Footer content and layout for legal/branding text.
- Add dependencies: gsap, react-icons and update pnpm lock.

package.json

@@ -29,6 +29,7 @@
     "clsx": "^2.1.1",
     "cmdk": "^1.1.1",
     "fuse.js": "^7.2.0",
+    "gsap": "^3.15.0",
     "lowlight": "^3.3.0",
     "lucide-react": "^1.7.0",
     "motion": "^12.38.0",
@@ -38,6 +39,7 @@
     "react": "19.2.4",
     "react-dom": "19.2.4",
     "react-fast-marquee": "^1.6.5",
+    "react-icons": "^5.7.0",
     "rough-notation": "^0.5.1",
     "tailwind-merge": "^3.5.0",
     "tippy.js": "^6.3.7",