Release @pi/ui 0.0.4: import lodash functions with their extension

lodash declares no exports, so `lodash/isEqual` resolves in a bundler but
not in Node's ESM loader: in 0.0.3 apps could not load @pi/ui in tests or
when rendering on the server.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

libs/ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@pi/ui",
-  "version": "0.0.3",
+  "version": "0.0.4",
   "description": "Librería de componentes Angular standalone (botones, campos con Signal Forms, cards, charts, drawer/hub/modal, theming vía tokens CSS...).",
   "license": "MIT",
   "generators": "./generators.json",