Update package.json exports for ESM-only build

- Remove module, unpkg, umd:main fields (no longer generating UMD/CJS)
- Update main to point to dist/Playground.js
- Simplify exports to types + import conditions only

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: agneym

.changeset/tender-hornets-relate.md

@@ -0,0 +1,5 @@
+---
+"@agney/playground": minor
+---
+
+Update the types and exports. The package is ESM only. Fix on latest 1.0 version

playground/package.json

@@ -23,17 +23,12 @@
     "README.md"
   ],
   "type": "module",
-  "main": "dist/playground.js",
-  "module": "dist/playground.module.js",
+  "main": "dist/Playground.js",
   "types": "dist/Playground.d.ts",
-  "unpkg": "dist/playground.umd.js",
-  "umd:main": "dist/playground.umd.js",
   "exports": {
     ".": {
-      "browser": "./dist/playground.module.js",
-      "umd": "./dist/playground.umd.js",
-      "import": "./dist/playground.module.js",
-      "require": "./dist/playground.js"
+      "types": "./dist/Playground.d.ts",
+      "import": "./dist/Playground.js"
     }
   },
   "publishConfig": {