fix: remove CSP-blocked inline event handlers (onerror, onclick)

- Remove all onerror="this.style.display='none'" from avatar imgs in
  layout_header.php, DashboardView.php, and TicketView.php (PHP + JS)
- Replace onclick SLA dismiss with data-action="dismiss-priority-banner"
  attribute; handler wired via existing click delegation in TicketView.php
- Global capture-phase error delegation in layout_footer.php handles all
  avatar image failures by adding .lt-avatar-img-err class (CSS display:none)

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

views/DashboardView.php

@@ -331,7 +331,7 @@ include __DIR__ . '/layout_header.php';
       <div class="workload-item">
         <div class="lt-avatar lt-avatar--sm <?= $avatarColor ?>" aria-hidden="true" title="<?= htmlspecialchars($name) ?>">
           <?php if ($userId > 0): ?>
-            <img src="/api/user_avatar.php?user_id=<?= $userId ?>" alt="" class="lt-avatar-img" onerror="this.style.display='none'">
+            <img src="/api/user_avatar.php?user_id=<?= $userId ?>" alt="" class="lt-avatar-img">
           <?php endif ?>
           <span class="lt-avatar-initials"><?= htmlspecialchars($initials) ?></span>
         </div>

views/TicketView.php

@@ -212,12 +212,7 @@ $progressClass  = $slaBreached ? 'lt-progress--red' : ($slaPct >= 75 ? 'lt-progr
       </div>
     </div>
   </div>
-  <button type="button" class="lt-alert-close" aria-label="Dismiss"
+  <button type="button" class="lt-alert-close" data-action="dismiss-priority-banner" aria-label="Dismiss">&#x2715;</button>
-          onclick="(function(btn){
-            var id=btn.closest('[data-alert-id]').dataset.alertId;
-            try{sessionStorage.setItem('lt_dismissed_'+id,'1');}catch(e){}
-            btn.closest('.lt-alert').classList.add('dismissed');
-          })(this)">&#x2715;</button>
 </div>
 <script nonce="<?= htmlspecialchars($nonce, ENT_QUOTES, 'UTF-8') ?>">
 (function(){
@@ -564,8 +559,7 @@ $progressClass  = $slaBreached ? 'lt-progress--red' : ($slaPct >= 75 ? 'lt-progr
                       <?php if ($commentUserId > 0): ?>
                         <img src="/api/user_avatar.php?user_id=<?= $commentUserId ?>"
                              alt=""
-                             class="lt-avatar-img"
+                             class="lt-avatar-img">
-                             onerror="this.style.display='none'">
                       <?php endif ?>
                       <span class="lt-avatar-initials"><?= htmlspecialchars($initials) ?></span>
                     </div>
@@ -978,7 +972,7 @@ document.addEventListener('DOMContentLoaded', function () {
             for (var i = 0; i < (w.display_name || '').length; i++) hash = ((hash << 5) - hash + (w.display_name || '').charCodeAt(i)) | 0;
             var color = avatarColors[Math.abs(hash) % 4];
             html += '<div class="lt-avatar lt-avatar--xs ' + color + '" title="' + lt.escHtml(w.display_name) + '" aria-label="' + lt.escHtml(w.display_name) + '">' +
-                    '<img src="/api/user_avatar.php?user_id=' + w.user_id + '" alt="" class="lt-avatar-img" onerror="this.style.display=\'none\'">' +
+                    '<img src="/api/user_avatar.php?user_id=' + w.user_id + '" alt="" class="lt-avatar-img">' +
                     '<span class="lt-avatar-initials">' + lt.escHtml(initials) + '</span>' +
                     '</div>';
         });
@@ -1121,6 +1115,12 @@ document.addEventListener('DOMContentLoaded', function () {
             if (typeof editComment === 'function') editComment(parseInt(commentId, 10));
         } else if (action === 'delete-comment' && commentId) {
             if (typeof deleteComment === 'function') deleteComment(parseInt(commentId, 10));
+        } else if (action === 'dismiss-priority-banner') {
+            var banner = target.closest('[data-alert-id]');
+            if (banner) {
+                try { sessionStorage.setItem('lt_dismissed_' + banner.dataset.alertId, '1'); } catch(ex) {}
+                banner.classList.add('dismissed');
+            }
         }
     });
 
@@ -1237,7 +1237,7 @@ document.addEventListener('DOMContentLoaded', function () {
             ' data-action="delete-comment" data-comment-id="' + commentId + '" aria-label="Delete comment">Del</button>' : '';
         var threadLine = parentId ? '<div class="thread-line" aria-hidden="true"></div>' : '';
         var avatarImg  = userId > 0 ?
-            '<img src="/api/user_avatar.php?user_id=' + userId + '" alt="" class="lt-avatar-img" onerror="this.style.display=\'none\'">' : '';
+            '<img src="/api/user_avatar.php?user_id=' + userId + '" alt="" class="lt-avatar-img">' : '';
 
         var div = document.createElement('div');
         div.className = 'comment ' + depthClass + ' ' + threadClass;

views/layout_header.php

@@ -166,7 +166,6 @@ $_lt_assetVer  = $GLOBALS['config']['ASSET_VERSION'] ?? '20260329';
           <img src="/api/user_avatar.php?user_id=<?= $_lt_userId ?>"
                alt=""
                class="lt-avatar-img"
-               onerror="this.style.display='none'">
         <?php endif ?>
         <span class="lt-avatar-initials"><?= htmlspecialchars($_lt_initials) ?></span>
       </div>