chore: better UMD local dev serving

package.json

@@ -24,7 +24,7 @@
 	"scripts": {
 		"start": "npm run dev --workspace=@page-agent/website",
 		"build": "npm run build --workspaces --if-present",
-		"build:lib": "npm run build:lib --workspace=page-agent",
+		"dev:umd": "npm run dev:umd --workspace=page-agent",
 		"version": "node scripts/sync-version.js",
 		"lint": "eslint .",
 		"prepare": "husky"
@@ -33,7 +33,9 @@
 		"@commitlint/cli": "^20.2.0",
 		"@commitlint/config-conventional": "^20.2.0",
 		"@eslint/js": "^9.39.2",
+		"@microsoft/api-extractor": "^7.55.2",
 		"@trivago/prettier-plugin-sort-imports": "^6.0.0",
+		"concurrently": "^9.2.1",
 		"dotenv": "^17.2.3",
 		"eslint": "^9.39.2",
 		"eslint-config-prettier": "^10.1.8",
@@ -47,9 +49,8 @@
 		"prettier": "^3.7.4",
 		"typescript": "^5.9.3",
 		"typescript-eslint": "^8.49.0",
-		"vite": "^7.3.0",
-		"@microsoft/api-extractor": "^7.55.2",
 		"unplugin-dts": "^1.0.0-beta.6",
+		"vite": "^7.3.0",
 		"vite-plugin-css-injected-by-js": "^3.5.2"
 	},
 	"lint-staged": {