- useHeaderBar.js - Wrap handlers with useCallback (logout, language/theme toggle, mobile menu) - Add null checks and try/catch around iframe postMessage (theme & language) - Keep minimal effect deps; remove unused StatusContext dispatch - Logo preload effect safe and scoped to `logo` - index.jsx - No functional changes; locale memoization remains stable Chore: - Lint clean; no runtime warnings - Verified no render loops or performance regressions
