chore: anade scripts npm para arrancar el playground y construir

libs/ui/README.md

@@ -12,7 +12,14 @@ libs/ui/src/
   lib/ui/<n>/         antes shared/ui/<n>     (29 libs)
 ```
 
-Construir: `nx build ui` · Lint: `nx lint ui`
+```bash
+npm start              # catálogo de componentes en http://localhost:4200
+npm run build          # construye la librería
+npm run build:playground
+npm run build:all      # librería + playground
+npm run lint
+npm run format
+```
 
 ## Qué se hizo
 

package.json

@@ -2,7 +2,15 @@
   "name": "@org/source",
   "version": "0.0.0",
   "license": "MIT",
-  "scripts": {},
+  "scripts": {
+    "start": "nx serve playground",
+    "playground": "nx serve playground",
+    "build": "nx build ui",
+    "build:playground": "nx build playground",
+    "build:all": "nx run-many -t build",
+    "lint": "nx lint ui",
+    "format": "prettier --write \"{apps,libs}/**/*.{ts,html,scss,md}\""
+  },
   "private": true,
   "dependencies": {
     "@angular-devkit/build-angular": "22.0.6",