Migrate to Bun + Biome, fix CORS with same-origin data URL

- Replace Node.js/npm with Bun for faster builds
- Replace ESLint with Biome for faster linting
- Use codecolor.ist/entdb-data for data URL (same origin, no CORS)

package.json

@@ -4,9 +4,10 @@
   "private": true,
   "scripts": {
     "dev": "next dev --turbopack",
-    "build": "next build --turbopack",
+    "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "biome check",
+    "lint:fix": "biome check --fix"
   },
   "dependencies": {
     "@base-ui/react": "^1.4.0",
@@ -34,14 +35,12 @@
     "use-debounce": "^10.0.5"
   },
   "devDependencies": {
-    "@eslint/eslintrc": "^3",
+    "@biomejs/biome": "^1.9.4",
     "@tailwindcss/postcss": "^4",
     "@types/node": "^25.6.0",
     "@types/react": "^19.2.14",
     "@types/react-dom": "^19.2.3",
     "@types/react-syntax-highlighter": "^15.5.13",
-    "eslint": "^10.2.0",
-    "eslint-config-next": "^16.2.3",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.3.7",
     "typescript": "^6.0.2"