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/dashboard.js

@@ -198,9 +198,10 @@ document.addEventListener('DOMContentLoaded', function() {
             case 'open-settings-modal':
                 if (typeof openSettingsModal === 'function') openSettingsModal();
                 break;
-            // Refresh
+            // Refresh — use lt.autoRefresh.now() so modal/focus guards are respected
             case 'manual-refresh':
-                window.location.reload();
+                if (window.lt && lt.autoRefresh) lt.autoRefresh.now();
+                else window.location.reload();
                 break;
             // Export
             case 'toggle-export-menu':