Release @pi/ui 0.0.9: a field shows its errors once touched

An untouched field with errors was painted red from the start, so a
form with required fields opened full of «Campo obligatorio». Text
fields, selects, checkboxes, radio groups and file uploads now wait
until the field is touched (blur, or the form's submit()).

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

libs/ui/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@pi/ui",
-  "version": "0.0.8",
+  "version": "0.0.9",
   "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",