Add lt.autoRefresh, fix showToast in admin, clean up inline styles

- Replace all 8 showToast() calls in ApiKeysView.php with lt.toast.*
  — all toast calls in the codebase now use lt.toast directly
- Add .duplicate-list, .duplicate-meta, .duplicate-hint CSS classes to
  dashboard.css; replace inline styles in duplicate detection JS with them
- Add dashboardAutoRefresh() using lt.autoRefresh — reloads page every
  5 minutes, skipping if a modal is open or user is typing in an input
- Add REFRESH button to dashboard header that triggers lt.autoRefresh.now()
  for immediate manual refresh with timer restart

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

assets/js/dashboard.js

@@ -1819,6 +1819,30 @@ function hideLoadingOverlay(element) {
     }
 }
 
+// ========================================
+// AUTO-REFRESH (lt.autoRefresh integration)
+// ========================================
+
+/**
+ * Reload the dashboard, but skip if a modal is open or user is typing.
+ * Registered with lt.autoRefresh so it runs every 5 minutes automatically.
+ */
+function dashboardAutoRefresh() {
+    // Don't interrupt the user if a modal is open
+    if (document.querySelector('.lt-modal-overlay[aria-hidden="false"]')) return;
+    // Don't interrupt if focus is in a text input
+    const tag = document.activeElement?.tagName;
+    if (tag === 'INPUT' || tag === 'TEXTAREA' || tag === 'SELECT') return;
+    window.location.reload();
+}
+
+document.addEventListener('DOMContentLoaded', function() {
+    // Only run auto-refresh on the dashboard, not on ticket pages
+    if (!window.location.pathname.includes('/ticket/')) {
+        lt.autoRefresh.start(dashboardAutoRefresh, 5 * 60 * 1000);
+    }
+});
+
 // ========================================
 // RELATIVE TIMESTAMPS
 // ========================================