chore: remove unused dependencies

Remove @react-three/drei, @react-three/fiber, three, @types/three
(replaced by @shadergradient/react), plus gray-matter, zod,
react-responsive-masonry and related @types packages that are
not imported anywhere in the codebase.

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

package.json

@@ -54,8 +54,6 @@
   "dependencies": {
     "@next/bundle-analyzer": "^15.1.7",
     "@prisma/client": "^5.22.0",
-    "@react-three/drei": "^10.7.7",
-    "@react-three/fiber": "^9.5.0",
     "@sentry/nextjs": "^10.36.0",
     "@shadergradient/react": "^2.4.20",
     "@swc/helpers": "^0.5.19",
@@ -67,12 +65,10 @@
     "@tiptap/html": "^3.15.3",
     "@tiptap/react": "^3.15.3",
     "@tiptap/starter-kit": "^3.15.3",
-    "@types/three": "^0.182.0",
     "@vercel/og": "^0.6.5",
     "clsx": "^2.1.1",
     "dotenv": "^16.6.1",
     "framer-motion": "^12.24.10",
-    "gray-matter": "^4.0.3",
     "lucide-react": "^0.542.0",
     "next": "^15.5.7",
     "next-intl": "^4.7.0",
@@ -84,12 +80,9 @@
     "react-dom": "^19.2.3",
     "react-icons": "^5.5.0",
     "react-markdown": "^10.1.0",
-    "react-responsive-masonry": "^2.7.1",
     "redis": "^5.8.2",
     "sanitize-html": "^2.17.0",
-    "tailwind-merge": "^2.6.0",
-    "three": "^0.182.0",
-    "zod": "^4.3.5"
+    "tailwind-merge": "^2.6.0"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3",
@@ -103,8 +96,6 @@
     "@types/nodemailer": "^6.4.17",
     "@types/react": "^19",
     "@types/react-dom": "^19",
-    "@types/react-responsive-masonry": "^2.6.0",
-    "@types/react-syntax-highlighter": "^15.5.11",
     "@types/sanitize-html": "^2.16.0",
     "autoprefixer": "^10.4.24",
     "cross-env": "^7.0.3",