Add emoji confetti bursts and component playground.

Support app.relay.emoji_confetti on jumbo emoji clicks with canvas physics,
per-emoji particle profiles, and a fixed overlay that does not affect scroll.
Also add a Vite playground for live component previews and theme hover preview.

package.json

@@ -14,7 +14,8 @@
     "check:eslint": "eslint src/*",
     "check:prettier": "prettier --check .",
     "fix:prettier": "prettier --write .",
-    "typecheck": "tsc --noEmit"
+    "typecheck": "tsc --noEmit",
+    "playground": "vite"
   },
   "keywords": [],
   "author": "Ajay Bura",
@@ -94,6 +95,7 @@
   },
   "devDependencies": {
     "@esbuild-plugins/node-globals-polyfill": "0.2.3",
+    "@monaco-editor/react": "4.7.0",
     "@rollup/plugin-inject": "5.0.5",
     "@rollup/plugin-wasm": "6.2.2",
     "@types/chroma-js": "3.1.2",
@@ -117,6 +119,7 @@
     "eslint-plugin-jsx-a11y": "6.10.2",
     "eslint-plugin-react": "7.37.5",
     "eslint-plugin-react-hooks": "7.1.1",
+    "monaco-editor": "0.52.2",
     "prettier": "3.9.4",
     "typescript": "6.0.3",
     "vite": "8.1.3",