Fix CSP-blocked chart scripts, undefined CSS classes, and double-firing click handlers

- Add nonce to charts and ticket-preview drawer inline <script> blocks in
  DashboardView.php (both were CSP-blocked — charts never rendered)
- Add .lt-modal-xs (280px) to base.css — used by quickStatus/quickAssign
  modals but was undefined, causing them to use full modal width
- Fix showConfirmModal in utils.js: class="text-center" → "lt-text-center"
  (undefined class); escape newlines as <br> so multi-line messages render
- Remove duplicate click-handler cases from DashboardView.php inline script
  that were already handled by dashboard.js, preventing double-firing
  (export-tickets, open-settings, remove-filter, etc. were all called twice)
- Fix manual-refresh action to use lt.autoRefresh.now() instead of bare
  window.location.reload() so modal/focus guards are respected

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

assets/js/utils.js

@@ -26,7 +26,7 @@ function showConfirmModal(title, message, type = 'warning', onConfirm, onCancel
     const color  = colors[type] || colors.warning;
     const icon   = icons[type]  || icons.warning;
     const safeTitle   = lt.escHtml(title);
-    const safeMessage = lt.escHtml(message);
+    const safeMessage = lt.escHtml(message).replace(/\n/g, '<br>');
 
     document.body.insertAdjacentHTML('beforeend', `
         <div class="lt-modal-overlay" id="${modalId}" aria-hidden="true" role="dialog" aria-modal="true" aria-labelledby="${modalId}_title">
@@ -35,8 +35,8 @@ function showConfirmModal(title, message, type = 'warning', onConfirm, onCancel
                     <span class="lt-modal-title" id="${modalId}_title">${icon} ${safeTitle}</span>
                     <button class="lt-modal-close" data-modal-close aria-label="Close">✕</button>
                 </div>
-                <div class="lt-modal-body text-center">
-                    <p class="modal-message">${safeMessage}</p>
+                <div class="lt-modal-body lt-text-center">
+                    <p>${safeMessage}</p>
                 </div>
                 <div class="lt-modal-footer">
                     <button class="lt-btn lt-btn-primary" id="${modalId}_confirm">CONFIRM</button>