Add comment skeleton loaders, workflow validation, monthly schedule fix

- TicketView.php: Show 3 lt-skeleton-card placeholders in the comment list
  while "Load more" fetches; skeletons are removed on resolve or error
- ticket.css: Add .comment-skeleton margin spacing
- WorkflowDesignerView.php + manage_workflows.php: Prevent creating/editing
  status transitions where from_status === to_status (client + server check)
- RecurringTicketsView.php: Expand monthly day picker from 28 to 31 days
  (days 29-31 labelled "last day in short months")
- RecurringTicketModel.php: Clamp monthly schedule day to last day of target
  month using format('t') instead of hard-capping at 28

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

views/TicketView.php

@@ -1141,10 +1141,33 @@ document.addEventListener('DOMContentLoaded', function () {
             loadMoreBtn.disabled = true;
             loadMoreBtn.textContent = 'Loading\u2026';
 
+            // Insert skeleton placeholders while fetching
+            var list = document.getElementById('commentsList');
+            var wrap = document.getElementById('loadMoreComments');
+            var skeletons = [];
+            for (var s = 0; s < 3; s++) {
+                var sk = document.createElement('div');
+                sk.className = 'lt-skeleton-card comment-skeleton';
+                sk.setAttribute('aria-hidden', 'true');
+                sk.innerHTML =
+                    '<div style="display:flex;gap:0.5rem;align-items:flex-start">' +
+                    '<div class="lt-skeleton lt-skeleton-avatar"></div>' +
+                    '<div style="flex:1">' +
+                    '<div class="lt-skeleton lt-skeleton-title" style="width:35%"></div>' +
+                    '<div class="lt-skeleton lt-skeleton-text"></div>' +
+                    '<div class="lt-skeleton lt-skeleton-text" style="width:75%"></div>' +
+                    '</div></div>';
+                list.insertBefore(sk, wrap);
+                skeletons.push(sk);
+            }
+
             var url = '/api/get_comments.php?ticket_id=' + td.ticket_id +
                       '&offset=' + td.commentOffset +
                       '&limit=' + td.commentPageSize;
             lt.api.get(url).then(function (data) {
+                // Remove skeleton placeholders
+                skeletons.forEach(function (sk) { if (sk.parentNode) sk.parentNode.removeChild(sk); });
+
                 if (!data.success) {
                     lt.toast.error('Failed to load comments: ' + (data.error || 'Unknown error'));
                     loadMoreBtn.disabled = false;
@@ -1152,8 +1175,6 @@ document.addEventListener('DOMContentLoaded', function () {
                     return;
                 }
 
-                var list = document.getElementById('commentsList');
-                var wrap = document.getElementById('loadMoreComments');
                 data.comments.forEach(function (c) {
                     list.insertBefore(buildCommentEl(c, td.currentUserId, td.isAdmin), wrap);
                 });
@@ -1178,6 +1199,7 @@ document.addEventListener('DOMContentLoaded', function () {
                     });
                 }
             }).catch(function (err) {
+                skeletons.forEach(function (sk) { if (sk.parentNode) sk.parentNode.removeChild(sk); });
                 lt.toast.error('Failed to load comments');
                 loadMoreBtn.disabled = false;
                 loadMoreBtn.innerHTML = 'Load more comments';

views/admin/RecurringTicketsView.php

@@ -212,10 +212,10 @@ function updateScheduleOptions() {
         });
     } else if (type === 'monthly') {
         dayRow.classList.remove('is-hidden');
-        for (var i = 1; i <= 28; i++) {
+        for (var i = 1; i <= 31; i++) {
             var opt = document.createElement('option');
             opt.value = String(i);
-            opt.textContent = 'Day ' + i;
+            opt.textContent = 'Day ' + i + (i > 28 ? ' (last day in short months)' : '');
             daySelect.appendChild(opt);
         }
     }

views/admin/WorkflowDesignerView.php

@@ -216,6 +216,10 @@ function saveTransition(e) {
         requires_admin:   document.getElementById('requires_admin').checked   ? 1 : 0,
         is_active:        document.getElementById('wf_is_active').checked     ? 1 : 0,
     };
+    if (data.from_status === data.to_status) {
+        lt.toast.error('From Status and To Status cannot be the same');
+        return;
+    }
     var url     = '/api/manage_workflows.php' + (data.transition_id ? '?id=' + data.transition_id : '');
     var apiCall = data.transition_id ? lt.api.put(url, data) : lt.api.post(url, data);
     apiCall.then(function (result) {