- Close button: <button class="backup-close-btn"><i data-lucide="x"></i></button> (same HTML pattern as AdminPanel editor-btn) - Handler: addEventListener via DOM query in setBody() after innerHTML (same JS pattern as AdminPanel) - Removed all inline onclick, global capture handler, window._backupViewerClose - CSS: .backup-close-btn now matches .editor-btn style (bordered icon button) - Escape key + overlay click still work for closing