refactor: replace verbose JS with hyperscript for contact form timestamp

Removed 34 lines of JavaScript (IIFE, MutationObserver, DOMContentLoaded)
and replaced with 2 lines of hyperscript in the existing 'on show' handler.

templates/partials/modals/contact-modal.html

@@ -15,7 +15,10 @@
                remove .hidden from querySelector('.form-note') in form
                set responseDiv to getElementById('contact-response')
                if responseDiv set responseDiv.innerHTML to ''
-             end">
+             end
+             -- Set timestamp for bot protection
+             set tsField to getElementById('contact-form-loaded-at')
+             if tsField set tsField.value to Date.now()">
     <div class="info-modal-content">
         <button class="info-modal-close" commandfor="contact-modal" command="close" aria-label="{{.UI.ContactModal.Close}}">
             <iconify-icon icon="mdi:close" width="24" height="24"></iconify-icon>
@@ -158,37 +161,4 @@
     </div>
 </dialog>
 
-<!-- Initialize form timestamp on page load and modal open -->
-<script>
-    (function() {
-        'use strict';
-
-        function resetContactFormTimestamp() {
-            const timestampField = document.getElementById('contact-form-loaded-at');
-            if (timestampField) {
-                timestampField.value = Date.now();
-            }
-        }
-
-        // Set initial timestamp on page load
-        document.addEventListener('DOMContentLoaded', resetContactFormTimestamp);
-
-        // Reset timestamp when modal opens (using MutationObserver to catch dialog open)
-        document.addEventListener('DOMContentLoaded', function() {
-            const contactModal = document.getElementById('contact-modal');
-            if (contactModal) {
-                // Observer watches for the 'open' attribute being added
-                const observer = new MutationObserver(function(mutations) {
-                    mutations.forEach(function(mutation) {
-                        if (mutation.attributeName === 'open' && contactModal.hasAttribute('open')) {
-                            resetContactFormTimestamp();
-                        }
-                    });
-                });
-
-                observer.observe(contactModal, { attributes: true });
-            }
-        });
-    })();
-</script>
 {{end}}