feat(playground): cinematic postprocess pass — bloom + ACES tone mapping + vignette + ambient sparkle particles

package.json

@@ -35,6 +35,7 @@
     "@monaco-editor/react": "^4.7.0",
     "@react-three/drei": "^10.7.7",
     "@react-three/fiber": "^9.6.1",
+    "@react-three/postprocessing": "^3.0.4",
     "@react-three/rapier": "^2.2.0",
     "@tailwindcss/vite": "^4.1.18",
     "@tanstack/react-query": "^5.84.1",
@@ -55,6 +56,7 @@
     "motion-utils": "^12.36.0",
     "playwright": "^1.58.2",
     "playwright-extra": "^4.3.6",
+    "postprocessing": "^6.39.1",
     "puppeteer-extra-plugin-stealth": "^2.11.2",
     "react": "^19.2.0",
     "react-dom": "^19.2.0",