fix(site-builder): coerce bare-number animation delay to a valid CSS time (2 -> 2s)

data-animation-delay is stored as a plain seconds string (e.g. '2'); the reveal
script assigned it raw to el.style.animationDelay, which is invalid CSS and no-ops.
Suffix 's' onto bare numbers (leaving '2s'/'200ms' alone) so entrance-animation
delays actually apply. Backend generateCompiledHTML gets the byte-identical change.

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

craft/src/utils/html-export.ts

@@ -354,7 +354,7 @@ const ANIMATION_CSS_MINIFIED = `@keyframes fadeIn{from{opacity:0}to{opacity:1}}@
 const ANIMATION_SCRIPT = `<script>
 document.querySelectorAll('[data-animation]').forEach(function(el) {
   var delay = el.getAttribute('data-animation-delay');
-  if (delay) el.style.animationDelay = delay;
+  if (delay) el.style.animationDelay = /^-?[0-9.]+$/.test(delay) ? delay + 's' : delay;
   new IntersectionObserver(function(entries) {
     entries.forEach(function(e) { if (e.isIntersecting) { el.classList.add('animated'); } });
   }, { threshold: 0.1 }).observe(el);