Configure GitHub Packages publishing

Scope the package as @richiesnitch/ads3-design-system, add repository +
publishConfig (GitHub Packages registry), and a publish-on-tag GitHub Actions
workflow. Add react/react-dom as devDependencies so the library build runs in
CI (they remain peerDependencies for consumers).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

package.json

@@ -1,8 +1,14 @@
 {
-  "name": "ads3-design-system",
-  "private": true,
+  "name": "@richiesnitch/ads3-design-system",
   "version": "0.1.0",
   "type": "module",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/Richiesnitch/ads3-design-system.git"
+  },
+  "publishConfig": {
+    "registry": "https://npm.pkg.github.com"
+  },
   "main": "./dist/index.js",
   "module": "./dist/index.js",
   "types": "./dist/src/index.d.ts",
@@ -64,6 +70,8 @@
     "playwright": "^1.60.0",
     "prettier": "^3.8.3",
     "prettier-plugin-tailwindcss": "^0.8.0",
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7",
     "storybook": "^10.4.0",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.59.2",