Error boundary wraps dashboard

Error boundary fallback has role=alert

Loading state rendered

Error state with retry and role=alert

Empty state handled

useEffect cleanup prevents stale updates

Stable unique keys on stat cards

Error state cleared on success

TypeScript interfaces for props

Props destructured in signature

ProductRow wrapped in React.memo

Flag handler stabilized with useCallback

Filtered/sorted list computed with useMemo or inline

No useEffect for derived state

Stable keys on product rows

No inline objects to memoized children

aria-live on result count

TypeScript interfaces for props

useCallback NOT used for native-only callbacks

Props destructured in signature

Interval cleanup in useEffect

Functional updater for state in interval

Unread count not in useEffect

No object in useEffect deps

Stable keys on notification items

Error handling with role=alert

aria-live on unread count

TypeScript interfaces for props

Loading state on initial render

Props destructured in signature

Controlled inputs

e.preventDefault on submit

noValidate on form element

Client-side validation with error messages

aria-required on required inputs

aria-invalid bound to error state

aria-describedby links to error element

role=alert on error messages

Labels with htmlFor

Loading state during save

TypeScript interfaces for props

Stable keys not index

Controlled input for new todo

Form prevents default

Empty input validation

Accessible delete/toggle buttons

role=alert on validation errors

aria-required on todo input

Remaining count not in useEffect

TypeScript interfaces for props

Props destructured in signature