feat(creator-studio): switch writing editor to TinyMCE

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

assets/creator-studio/package.json

@@ -9,18 +9,9 @@
   "devDependencies": {
     "@types/react": "18.3.31",
     "@types/react-dom": "18.3.7",
-    "@wordpress/api-fetch": "^6.28.0",
-    "@wordpress/block-editor": "11.8.0",
-    "@wordpress/block-library": "^8.8.0",
-    "@wordpress/blocks": "12.8.0",
-    "@wordpress/components": "^23.8.0",
-    "@wordpress/compose": "^6.8.0",
-    "@wordpress/data": "9.5.0",
     "@wordpress/element": "5.8.0",
-    "@wordpress/hooks": "^3.31.0",
     "@wordpress/i18n": "4.31.0",
     "@wordpress/scripts": "26.4.0",
-    "@wordpress/wordcount": "3.31.0",
     "sass": "1.77.8",
     "typescript": "5.4.5"
   }